Saturday

April 30, 2016
Number of results: 30,113

**Statistics**

Total plasma volume is important in determining the required plasma component in blood replacement theory for a person undergoing surgery. Plasma volume is influenced by the overall health and physical activity of an individual. Suppose that sample of 50 male firefighters are ...
*June 25, 2010 by stan*

**AP Chemistry**

A mixture of 20.0 grams of CaO and BaO is placed in a 12.5 L vessel at 200oC with excess CO2 . The mixture is allowed to react to completion forming CaCO¬3 and BaCO3 .The pressure in the container after reaction is 220 torr. The solid carbonates are neutralized by adding 650.0...
*January 3, 2015 by Jim*

**Statistics**

Based on information from Harper's Index, 37 out of a random sample of 100 adult Americans who did not attend college believe in extraterrestrials. However, out of a random sample of 100 Americans who did attend college, 41 claim that they believe in extraterrestrials. At the ...
*April 23, 2013 by Torri*

**Grade 12 chemistry**

This is the second reaction: HCl(aq)+NaOH(aq)-->NaCl(aq)+H2O(l) (Heat of neutralization) This reaction involves mixing two solutions: 1.00 mol/L NaOH and 1.00 mol/L HCl. Trial 1: 48.0 mL of the NaOH solution is mixed with 47.5 mL of the HCl. The temperature rises from 22.00...
*January 1, 2012 by tessa*

**Chemistry please check!**

A 0.21g sample of sulfuric acid is dissolved completely in sufficient water to make 0.25 litre of final solution. Calculate the hydrogen ion concentration in mol1-1 in this solution and show successive steps in the calculation: If 0.21g in 0.25l then 0.84g in 1l. Add together ...
*March 9, 2007 by Hol*

**Chemistry, pH, Buffers**

Please help!! Given this data: mass of unknown acid 1.4671g Volume of NaOH used in titration 18.47mL Concentration of the NaOH used 0.2403M pH of the original acid solution 2.16 pH of the final acid solution 3.49 Show me how do I calculate the Ka of the unknown acid and the ...
*April 2, 2012 by Krina*

**chemistry**

Two aqueous solutions of sucrose, C12H22O12, are mixed. One solution is 0.1495 M sucrose and has d = 1.018 g/mL; the other is 12.00 % sucrose by mass and has d = 1.038 g/ml. Calculate the moles C12H22O12 percent in the mixed solution. Please provide steps 100 mL for each soln.
*February 17, 2010 by anonymous*

**Physics**

A)What mass of silver chloride can be produced from 1.33 of a 0.207 solution of silver nitrate? I got this one, its 39.4 g B)The reaction described in Part A required 3.28 of potassium chloride. What is the concentration of this potassium chloride solution? I keep getting 0.08...
*October 14, 2011 by Kristi*

**Chemistry**

A)What mass of silver chloride can be produced from 1.33 of a 0.207 solution of silver nitrate? I got this one, its 39.4 g B)The reaction described in Part A required 3.28 of potassium chloride. What is the concentration of this potassium chloride solution? I keep getting 0.08...
*October 14, 2011 by Kristi*

**math**

a college lab paced two orders with a chemical supplier. the first order was for 13 bottles of calcium hydroxide solution and 4 bottles of sulfuric acid and totalled $ 487. the second order was for 6 bottles of calcium hydroxide solution and 2 bottles of sulfuric acid and ...
*October 20, 2011 by patel*

**math**

a college lab paced two orders with a chemical supplier. the first order was for 13 bottles of calcium hydroxide solution and 4 bottles of sulfuric acid and totalled $ 487. the second order was for 6 bottles of calcium hydroxide solution and 2 bottles of sulfuric acid and ...
*October 20, 2011 by patel*

**chemistry**

1. Would it be advisable to determine the freezing point of pure p-dichlorobenzene with one thermometer and the freezing point of the solution with a different one? Explain. 2. If 0.150 mole of a nonvolatile non-electrolyte solute is present in 1200g of water, what are the ...
*February 2, 2012 by Larry*

**Chemistry**

1. Would it be advisable to determine the freezing point of pure p-dichlorobenzene with one thermometer and the freezing point of the solution with a different one? Explain. 2. If 0.150 mole of a nonvolatile non-electrolyte solute is present in 1200g of water, what are the ...
*February 19, 2016 by Allie*

**Math**

A pathologist, trying to identify a bacterial infection, places a sample in a growth chamber and measures 1000 bacteria at the end of day 5 of the test. From daily measurements, the growth rate of the number of bacteria is determined to be 5% per day. Note that: A linear ...
*October 25, 2011 by Matt*

**Chemistry **

Can someone please check my work? Calculate the mass of (NH4)2S2O8 needed to prepare 250mL of a 0.100M solution. I got 5.705 g. Calculate the volume of 2.00M KI needed to prepare 250mL of a 0.200M solution. I got 0.025L or 25mL. Calculate the volume of 0.100M Na2S2O3 needed to...
*January 22, 2011 by Rachel*

**Chemistry**

The formate ion, (CHO2-), is related to the acetate ion and forms ionic salts with many metal ions. Assume that 9.7416 g of M(CHO2)2 (where M represents the atomic symbol for a particular metal) are dissolved in water. When a solution of 0.200 M sodium sulfate is added, a ...
*September 19, 2014 by Aaron*

**Chemistry**

The formate ion, (CHO2-), is related to the acetate ion and forms ionic salts with many metal ions. Assume that 9.7416 g of M(CHO2)2 (where M represents the atomic symbol for a particular metal) are dissolved in water. When a solution of 0.200 M sodium sulfate is added, a ...
*September 19, 2014 by Aaron*

**molarity**

An aspirin tablet weighing 0.475 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved the tablet in hot NaOH and the cooled solution was diluted with DI water to the mark in a 250 mL volumetric flask. Exactly 3.00 mL of the solution was ...
*February 16, 2007 by christine*

**Algebra 116**

1. The perimeter of a rectangle is 126 m. The length is 6 m more than twice the width. Find the dimension. a. What is the length ____ m? b. What is the width ____ m? 2. Two angles are complementary. The sum of the measure of the first angle and half of the second angle is 72 ...
*September 24, 2008 by MzMaria*

**STATISTICS**

Researchers reported that in a sample of U.S. women aged 50 to 54 who underwent mammography, 14.4% were recalled for further evaluation; however, in a similar sample of women undergoing mammography in the United Kingdom, only 7.6% were recalled for further evaluation. What are...
*August 6, 2013 by Susie*

**Stastistics**

The effect of a drug to change in heart beat by 5 beats per minute over 48 hours in either direction. A two sided test conducted at the 0,05 level of significance will be used. What sample size is needed for this study. The mean for the population u = 75 beats per minute STD...
*February 25, 2016 by Ramon*

**thermodynamics**

Saturated water vapor at 100 kPa jets into a pitcher containing 0.17 Kg of water initially at 278 K. If steam ow rate is 4 gm/min, estimate how long it takes to heat the water to 322 K. Assume the process is at constant pressure (at 100 kPa) and kinetic energy of the incoming ...
*March 30, 2010 by john*

**thermo**

Saturated water vapor at 100 kPa jets into a pitcher containing 0.17 Kg of water initially at 278 K. If steam ow rate is 4 gm/min, estimate how long it takes to heat the water to 322 K. Assume the process is at constant pressure (at 100 kPa) and kinetic energy of the incoming ...
*March 31, 2010 by john*

**ap chem**

a solution is prepared by dissolving 4.87 g of sodium dichromate in 25.0 ml of water. (d=1.00g/mL).calculate a. the mass percent of sodium dichromate in the solution. b. the mass percent o water in the solution. c the mole fraction of sodium dichromate in the solution. How ...
*February 20, 2007 by just*

**science**

what is a sample of a gas
*August 27, 2007 by matt*

**chemistry**

How many mililmeters(mL) are in a sample with 2.0L?
*November 6, 2009 by Dona*

**chemistry**

a 5.0 g sample of KBr at 25.0
*April 10, 2010 by Anonymous*

**Please Math**

8. p + 4 < –24 p < –20 p < 28 p < –28 p < 20 9.p/8 ≥ –5 p ≥ 40 p ≥ 3 p ≥ –13 p ≥ –40 10. –5p > –30 p > 6 p < 6 p > –35 p < 35 11. Which inequality matches the graph? 3x + 1 > 4 3x + 1 ≥ 4 3x + 1 < 4 3x + 1...
*December 17, 2015 by Hotline Bling*

**Science**

You have a solution that contains Ag* ions and another that contains Na* ions. How would adding a solution that contains Cl- ions to these solutions enable you to tell which is which?
*October 22, 2011 by Sheryl*

**Statistics**

An automobile dealership has as one of its performance goals that the proportion of its automobiles sold that are deemed “good value for the money” by the purchasers be at least .90. For a random sample of 400 automobiles sold over the past six months, 352 were deemed by the ...
*April 20, 2012 by Sheila*

**Chemistry**

Construct a standard curve (absorbance vs. concentration) using the following results. A 5mL, 10mL, 15mL,20mL aliquot of 0.010M sodium salicylate solution was diluted to 100 mL in four different volumetric flasks with the Iron (III) chloride solution. The % Transmittance for ...
*October 16, 2015 by Ati*

**Chemistry**

A solution containing 7.00grm of lead nitrate is combined with a solution containing 7.00g of sodium sulfate. (a) write a balance equation for the reaction. Pb(no3)2 aq + NaSo4 aq ---> PbSo4 +2 NaNo3. I think thats right. (b)How many moles of the the product are formed? Is ...
*March 9, 2010 by Mike*

**chemistry**

A chemist must dilute 55.6 ml of 1.48 M aqueous silver nitrate (AgNO3) solution until the concentration falls to 1.00M. He'll do this by adding distilled water to the solution until it reaches a certain final volume. Calculate this final volume, in milliliters. Round your ...
*August 31, 2012 by Lizzy*

**Chemistry**

Measuring the conductivity of an aqueous solution in which 0.0200 mol CH3COOH has been dissolved in 1.00 L of solution shows that 2.96 % of acetic acid molecules have ionized to CH3COO- ions and H3O+ ions. Calculate the equilibrium constant for ionization of acetic acid and ...
*November 12, 2013 by Vanessa*

**Math **

Use the acidity model given by pH = −log[H+], where acidity (pH) is a measure of the hydrogen ion concentration [H+] (measured in moles of hydrogen per liter) of a solution. Compute [H+] for a solution in which pH = 6.2. (Enter your answer in scientific notation. Round ...
*April 20, 2016 by Sarah*

**El camino college:math **

The xyz corporation claims that there's NO DIFFERENCE in the salary of female and male workers at the Southern California plant. A human rights agency took two samples(25 each) .the male sample gad a mean of 350per week wit standard deviation of 50. The female sample had a ...
*August 4, 2015 by Alma*

**chemistry**

20 mL of 0.125 M potassium iodide solution is mixed with 10 mL of 0.1 g L–1 sodium thiosulfate solution and 0.2 g of solid iodine indicator is added. To this solution is added 20 mL of 0.025 M peroxodisulfate solution. After 46 seconds a blue colour appears, indicating that ...
*May 9, 2014 by dan*

**math-matrix equations**

I have a problem with the following homework question: Which product represents the solution to the system: -y + 7x=14 -x + 4y=1 a. | (1/27) (4/27)| | (7/27) (1/27)| b. | (-7/3) (4/3) | | (-1/3) (1/3) | c. | (7/3) (-4/3) | | (1/3) (-1/3) | d. | (-1/27) (-4/27) | | (-4/27) (-1/...
*May 2, 2008 by Jennifer*

**Chemistry**

Solutions are made that contain 0.1 moles of each of the following compounds below in 100 g of H2O. Choose the compound whose solution will have the lowest freezing point. NaBr MgCl2---- KClO3 CO2 MgSO4 I know the answer is MgCl2 but I don't know how to get it. I know I have ...
*February 10, 2010 by Angel *

**Chemistry**

If 0.125 L of a 0.100 M solution of Ba(OH02 are mixed with 0.200 L of a 0.0750 M solution of H3PO4, the following reaction takes place. 3Ba(OH)2 + 2H3PO4 ---> Ba3(PO4)2 + 6H2O What mass of barium phosphate is formed? I got 2.51 g Ba3(PO4)2, is that correct? If not could ...
*April 29, 2010 by Ana*

**statistic**

2. A sociologist conducted a study of divorce patterns in a Midwestern city. In the study, 200 divorced people were selected at random, and X, the number of years married before divorce, was measured. From this sample, it was found that the sample mean was 8.7 years, and that ...
*January 30, 2011 by Tian*

**ap chemistry**

a solution of CH4N2O in water has a vapor pressure of 19.6 torr. at 25C. what is the mole fraction of CH4N2O in this solution? HELP ME WATER PURE PRESSURE (P0) IS 23.8 TORR VAPOR PRESSURE IS 19.6 TORR DONT KNOW HOW TO SOLVE IT ? P(SOLUTION)= X (CH4N2O) WATER (PURE PRESSURE)
*January 6, 2015 by yeng*

**Statistics**

Twelve different video games showing substance use were observed and the duration times of game play (in seconds) are listed below. The design of the study justifies the assumption that the sample can be treated as a simple random sample. Use the data to construct a 90% ...
*February 12, 2014 by Stephanie*

**Statistics**

part 2 - An entertainment company owns and operates movie theaters in Wyoming. The president of the company is concerned that film rentals are hurting the business. They directed a staff member to estimate the total number of films rented by households in wyoming in a ...
*March 2, 2007 by Jason L*

**chem**

I am still having a little problem with my original question. However, this is what I have done so far. I am not sure what to do with the density of the solution of 0.78 g/mL. The answer I came up with is 5.47 mol/kg. I found the density of the water in grams then I converted ...
*February 13, 2011 by paula*

**re-chem please**

if i had a beaker with .0001M of Cu solution and copper solid (anode) and another beaker with 1M Cu solution and Cu solid (cathode), how would i calculate the half reactions of these two? would the two equations be: cu2+(aq) --> Cu(s) + 2e- and ?
*January 26, 2009 by sarah*

**chemisty**

A nitric acid solution is neutralized using sodium hydroxide. How many grams of sodium hydroxide are needed to neutralize 5.50 L of 1.200 M nitric acid solution? HNO3 (aq) + NaOH (aq) → H2O (l) + NaNO3 (aq)
*December 1, 2010 by silent*

**Chemistry**

A solution contains 0.133 g of dissolved Lead. How many moles of soduim chloride must be added to the solution to completly precipitate all of the disolved lead? What mass of sodium chloride must be added?
*May 14, 2011 by Katie*

**chemistry**

A student placed 10 g of Mg(OH)2 into a flask and added 500ml of water. The student took 100 ml of the Mg(OH)2 solution and reacted with HCl(aq). If 13.75 ml of 0.010M HCL reacted with the OH(aq), was was the concentration of hydroxide ion in the 100 ml solution?
*November 7, 2011 by Anne*

**chemistry **

You extract the iron from a tablet and dilute that to 350.0 ml in a volumetric flask. You transfer 0.500 ml of this solution to a 75.0 ml volumetric flask and dilute this to volume. When you measure the concentration of this solution, you find that it is 1.87 ppm Fe. How many...
*October 28, 2012 by Kelcie*

**chemistry**

2) Suppose you have 5.00g of powdered magnesium metal, 1.00L of 2.00M potassium nitrate solution, and 1.00L of a 2.00M silver nitrate solution. a. Which one of the solutions will react with the magnesium powder?
*March 17, 2013 by Anonymous*

**Algebra**

Paula Scott, a massage therapist needs 3 ounces of a 20% lavender oil solution. She has only 5% and 30% lavender oil solutions available. How many ounces of each should Paula mix to obtain the desired solution?
*March 28, 2013 by Lora*

**Chemistry**

You extract the iron from a tablet and dilute that to 250.0 ml in a volumetric flask. You transfer 0.400 ml of this solution to a 25.0 ml volumetric flask and dilute this to volume. When you measure the concentration of this solution, you find that it is 3.27 ppm Fe. How many ...
*April 11, 2013 by Spider*

**chemistry**

At 29.6 degrees C, pure water has a vapor pressure of 31.1 torr. A solution is prepared by adding 86.7 g of "L" a nonvolatile nonelectrolyte to 390.0 g of water. The vapor pressure of the resulting solution is 27.6 torr. Calculate the molar mass of "L"
*February 13, 2015 by J*

**statistics and probability**

When a die is rolled and a coin(with heads and tails) is tossed,find the probability of obtaining, (a). Tails and an even number. solution. A={HH,TT,HT,HT} B={HH,TH} (b). A number greater than 3 SOLUTION. let event C=(AuB) P(C)=P(AuB)=P(A)+P(B)-P(AnB) =3/4
*December 3, 2015 by masinde*

**Chemistry**

Would you store a solution of zinc nitrate in an aluminum container? Use half-reactions to explain your answer. Al ==> Al^+3 + 3e Zn ==> Zn^+2 + 2e Look up the above half reactions and you will see that the Al will go into solution and the Zn+2 will come out. Eventually...
*January 21, 2007 by J.M.*

**chemistry**

oxalic acid, h2c2o4, is a weak acid capable of providing two H3O+ ions. ka=.059 k2=6.4E-5 the [h3o]+ in a .38 M solution of h2c2o4 is .12M and can be calculated by the first ionization step only. what is the equilibrium concentration of the oxalate ion c2o4^-2, in the .38 M ...
*December 4, 2010 by anonymous*

**Chemistry **

Using a table of standard electrode potentials (such as the one in your textbook), calculate the standard cell potential for a cell made by placing a zinc electrode in a Zn2+(aq) solution which is connected by an electrolyte to a Ag+(aq) solution containing a silver electrode...
*May 13, 2014 by CHEM HELP ASAP*

**Chemistry **

1) Using a table of standard electrode potentials (such as the one in your textbook), calculate the standard cell potential for a cell made by placing a zinc electrode in a Zn2+(aq) solution which is connected by an electrolyte to a Ag+(aq) solution containing a silver ...
*May 13, 2014 by CHEM HELP ASAP*

**Chemistry **

HCl is a gas at room temperature and does not conduct electricity. Yet when dissolved in water, the solution becomes an excellent conductor. Classify HCl as metallic, ionic, molecular or covalent network, and explain why HCl would conduct electricity in an aqueous solution.
*February 25, 2015 by Morgan *

**Chemistry**

why does a solution made of starch get thick when heated in water? Is starch insoluable? If it is, would the answer be because the solution just forms complexes of suspended solids which thinken the mixture? Or would it be because granules of starch uncoil to give long strands...
*August 8, 2010 by Bobby*

**chem**

a 10.0% sucrose solution has a density of 2.00 g/mL. what is the mass of sucrose dissolved in 1.00 liter of this solution? thanks, mary Well, in a liter, there are 2000 grams (from density), and 200 of those are sucrose.
*April 21, 2007 by mary*

**Chemistry**

A 23.6 molar solution of formic acid (methanoic acid) has a density of 1.16 g/ml. The molar mass of H, C, and O are 1g/mol, 12g/mol and 16 g/mol, respectively. What is the molality of this solution?
*December 7, 2010 by Eddie*

**Algebra**

Determine whether the given numbers are solutions of the inequality. 4, -11, -19, -1 y-8>2y-3 Are any of these numbers a solution of the inequality? Which are not? My answer is none of them are a solution because the answer to the inequality is -5. Or am I completely wrong?
*June 9, 2011 by samae*

**Chemistry partial molar volumes**

The partial molar volumes of the CCl4 and benzene are 122cm3/mol and 98.0 cm3/mol, respectively in a solution in which mole fraction of chloroform is 0.2. Calculate the volume occupied by 2.5 moles of the solution. Thank yOu.
*August 24, 2011 by Urgent pls.*

**chemistry**

In the following experiment, a coffee-cup calorimeter containing 100mL of H2 is used. The initial temperature of the calorimeter is 23.0 C . If 3.40g CaCl2 of is added to the calorimeter, what will be the final temperature of the solution in the calorimeter? The heat of ...
*November 24, 2011 by Yuli*

**Chemistry**

A buffer is prepared by mixing 0.30 mole of formic acid (HCNO2) and 0.20 mole of sodium formate (NaCHO2) in enough water to make 0.50 liter of solution. Ka of formic acid is 1.7 x 10-4. Calculate the pH of the resulting buffer solution.
*March 7, 2012 by Sam*

**Chemistry**

Consider the following chemical reaction 2HCL+ Ca(OH)2 CaCl2+2H2O You have mixed 30.00ml of 0.150 M HCl solution with 20.00ml of 0.100m Ca(OH)2 solution what is the molarity of the HCl, Ca( OH)2 and CaCl2 after the reaction has stopped
*December 3, 2013 by Ruffles*

**chemsitry**

100ml of h2s04 solution having molarity 1M and density 1.5g/ml is mixed with 400ml of water. calculate final molarity of h2s04 solution, if final density is 1.25g/ml. Answer 0.227M Who helps me to solve it Thank you a lot
*December 28, 2014 by Ferda*

**math115**

A chemist has 400 milliliters (mL) of solution that is 21% acid. How many milliliters of acid are in the solution?
*September 14, 2009 by dwayne*

**chemistry**

If you dissolve 3.5 moles of CaCl2 in a solution, how many moles of C+2 ions and C- ions will there be in the solution?
*March 20, 2015 by Hannah*

**social studies**

Please help me plese here are the 5 question social studies 1. What problems did the United States face in the Vietnam War? 2. What options were available to President Johnson? To President Nixon? What were the advantagees and disadvantages? 3. Explain the solution President ...
*June 6, 2013 by nini*

**chemistry**

To a 100.0 mL solution containing 0.0100 M Ba(NO3)2 and 0.0100 M Pb(NO3)2 was added 101.0 mL of 0.0100 M H2SO4 to provide a slight excess of SO42- relative to Ba2+ in the resulting solution. Assuming that: i) H+ does not bind to SO42- ii) ionic strength effects can be ignored ...
*November 4, 2015 by john*

**Soil Chemistry**

In saturated soils, oxygen is quickly depleted and microbes must utilize the next most favorable electron acceptor, in this case sulfate (SO42-). Under these conditions, Mn (and Fe) are oxidized to Mn2+ (and Fe2+). Select the correct oxidation and reduction pair for Mn. A. ...
*June 30, 2014 by John*

**Math**

Determine if f could be a linear function x 0 1 2 3 4 f(x) 3 5 7 11 15 is this a linear function and then... 2x - 6y = 12 3x-9y = -27 What is the solution of the system of equations? A) no solution B) a point C) infinitely many solutions Is the system consistent or ...
*September 26, 2008 by Mike*

**chemistry (litmus paper)**

When using litmus paper I was wondering why do you first wet it? Second, I wanted to know is why is it not suppose to touch the solution? Third, how doo you test for solutions if it is not suppose to touch the solution.
*May 4, 2009 by Lou*

**Chem**

Osmotic Pressure.. If the height of the column is 6 cm what is the osmotic pressure of the sugar solution in g/cm2 Assume the density of the solution is 1.01 g/ml.. Beaker of water with beaker of sugar solutution with semi permeable membrane
*February 19, 2010 by donna*

**chemistry**

A galvanic cell has an iron electrode in contact with 0.20 M FeSO4 and a copper electrode in contact with a CuSO4 solution. If the measured cell potential at 25 degrees Celcius is 0.61 V , what is the concentration of Cu2+ in the CuSO4 solution?
*May 17, 2011 by jeff*

**college general chem**

If 15.0 of is dissolved in enough water to form 270 of solution, what is the molarity of the solution? What is the oxidation state of an individual sulfur atom in ? What is the oxidation state of an individual nitrogen atom in ?
*October 3, 2011 by ronie*

**chem**

How many grams of a stock solution that is 87.0 percent H2SO4 by mass would be needed to make 200 grams of a 35.5 percent by mass solution? Show all of the work needed to solve this problem
*January 17, 2012 by bryan*

**Chemistry**

A chemist wants to make a solution of 3.4 M HCl. There are two solutions of HCL that he can find on the shelf. One has a concentration of 6.0 M, while the other has a concentration of 2.0 M. Which solution can the chemist use to make the desired acid?
*February 16, 2012 by Hunter*

**calculus**

solve the exponential equation. Express the solution in terms of natural logarithms. e^x=9.2 a. whats the solution in terms of natural logarithms? **is the answer e^9.2 or just e^9 b. type a decimal rounded to 3 decimal places.
*January 1, 2013 by Brock*

**math**

An alcohol solution consists of 6 gallons of pure water and x gallons of alcohol, x > 0. Let f(x) be the ratio of the volume of alcohol to the total volume of liquid. [Note that f(x) is the concentration of the alcohol in the solution.] (a) Find a possible formula for f(x).
*April 23, 2013 by emily *

**math**

An alcohol solution consists of 6 gallons of pure water and x gallons of alcohol, x > 0. Let f(x) be the ratio of the volume of alcohol to the total volume of liquid. [Note that f(x) is the concentration of the alcohol in the solution.] (a) Find a possible formula for f(x).
*April 23, 2013 by emily *

**Chemistry**

How many grams of a stock solution that is 87.0 percent H2SO4 by mass would be needed to make 200 grams of a 35.5 percent by mass solution? Show all of the work needed to solve this problem.
*September 2, 2013 by Stephanie*

**Chemistry**

when 2g of NaOH were dissolved in 149 g of H2o in a calorimeter at 24 degrees C the temperature of the solution went up to 29 degrees C. If the calorimeter constant was 11 cal/C find delta H for the solution of one mole of NaOH in H2O
*October 19, 2014 by Dexter*

**chemistry**

when 130.4 mL of 0.459 mol/L silver nitrate solution is mixed with 85.23mL of 0.251 mol/L aluminum chloride solution, a precipitate of silver chloride forms. Find the mass of this Precipitate.
*February 15, 2016 by Emma*

**Chemistry **

100ml of h2s04 solution having molarity 1M and density 1.5g/ml is mixed with 400ml of water. Calculate final molarity of h2s04 solution if final density 1.25g/ml. Ans is 0.227M Who help me thanks a lot
*April 26, 2016 by Mohit *

**Chemistry**

How many grams of a stock solution that is 85.5 percent H2SO4 by mass would be needed to make 150 grams of a 45.0 percent by mass solution? Show all of the work needed to solve this problem.
*April 29, 2016 by DAyanne*

**Chemistry**

When 50.0mL of 0.100M NH3 (Kb=1.8x10^-5) solution is mixed with 20.0mL of of 0.250M HCl solution, what is the pH after reaction? I solved the ka=5.56x10^-10 and I solved the moles of each nHCl and nNH3 and both have 0.005 moles. What do I do after this? Thanks.
*February 15, 2009 by Kearstyn*

**Chemistry**

When 50.0mL of 0.100M NH3 (Kb=1.8x10^-5) solution is mixed with 20.0mL of of 0.250M HCl solution, what is the pH after reaction? I solved the ka=5.56x10^-10 and I solved the moles of each nHCl and nNH3 and both have 0.005 moles. What do I do after this?
*February 15, 2009 by Kearstyn*

**Pharmacy math**

concentrated hydrochloric acid is a 38% solution of hcl in water and has a density of 1.18g/ml. How many milliliters of concentrated hydrochloric acid are needed to prepare 500ml of a 1:200 hcl solution? Who helps me to solve it for me. I think 2.12 ml is not right.
*July 24, 2012 by Fai*

**Chemistry**

A solution of potassium hydroxide is in equilibrium with an undissolved solute at 45 degrees Celsius. What will happen to the mass of the potassium hydroxide if the temperature is raised to 50 degrees Celsius? (Given that heat of solution is -57.6kJ/mol)Please explain as well.
*December 14, 2012 by Dayton*

**chemistry**

Concentrated phosphoric acid,H3PO4 was added slowly into some water to produce 5.0dm^3 of a dilute acid solution.100g of the pure phosphoric acid,H3PO4 was present in the solution.Find the concentration of the acid,in g dm^-3.
*May 5, 2014 by mandy*

**chemitry**

help me.. The pKa of acetic acid, HC2H3O2, is 4.76. A buffer solution was made using an unspecified amount of acetic acid and 0.30 moles of NaC2H3O2 in enough water to make 2.00 liters of solution. Its pH was measured as 4.40. How many moles of HC2H3O2 were used?
*April 24, 2015 by Azy*

**chem**

A student mixes 5 mL of 2.00 x 10^-3 M Fe(NO3)3 with 5 mL 2.00 x 10 ^-3 M KSCN. They find that in the equilibrium mixture concentration of FeSCN^2+ is 1.40 x 10^-4 M. Find each of the following: the initial concentration in solution for Fe^3+ and SCN, the equilibrium constant ...
*October 14, 2015 by Grant*

**Chemistry**

When an aqueous solution of sodium hydroxide, NaOH, is added to an aqueous solution of chromium(III) nitrate, Cr(NO3)3, a precipitate of chromium(III) hydroxide, Cr(OH)3, forms. Write a balanced net ionic equation for this reaction.
*March 1, 2016 by Tina*

**statistics**

A standardized third grade reading test, called the We Can Read Test, has a mean of 50 with a standard deviation of 10. A developmental psychologist conducts a study, where he assesses the reading ability of a random sample of 75 third graders using the We Can Read Test, and ...
*April 16, 2014 by Carrie*

**Chemistry**

When a clear aqueous solution of calcium chloride (CaCl2) is mixed with a clear aqueous solution of sodium carbonate (Na2CO3), a white solid precipitate forms. What happens to the mass of the mixture after the solid precipitate forms? Choose the best answer. Mass decreases ...
*September 25, 2012 by Lily*

**science **

2. A 75.0 g sample of a metal is placed in boiling water until its temperature is 100.00C. A calorimeter contains 100.00 g of water at a temperature of 24.40C. The metal sample is removed from the boiling water and immediately place in water in the calorimeter. The final ...
*April 22, 2015 by Lilian*