Friday

October 9, 2015
Number of results: 28,475

**Chemistry**

A solution was made by dissolving 62.07 grams of a compound in 500g of water. The compound was not ionic. The freezing point of the solution was measured and found to be -1.86 degrees celsius. Using the Kf value in your textbook, the molar mass of this conpound can be ...
*February 12, 2012 by Hannah*

**CHEMISTRY**

a solution of sodium hydroxide is standardized against potassium hydrogen phthalate (KHP, formula weight 204.2 g/mol). From the following data, calculate the molarity of the NaOH solution: mass of KHP 1.404 g; buret reading before titration 0.13 mL; buret reading after ...
*October 18, 2013 by maria*

**Chemistry**

When 20.8 g of calcium chloride, CaCl2, was dissolved in water in a calorimeter, the temperature rose from 25.0°C to 37.1°C. If the heat capacity of the solution and the calorimeter is 1258 J/°C, what is the enthalpy change when 1 mol of calcium chloride dissolves in water? ...
*October 18, 2008 by Glenna*

**College Chemistry**

A stock solution is prepared by adding 20mL of 0.2M Na3PO4 to enough water to make 80mL. What is the Na+ concentration of 20mL of the stock solution? I am thinking .012: a) .02 times .2 = .004 b).004 times 3 = .012 (for each Na in the molecule) Seems too simple
*March 29, 2012 by Kev*

**Chemistry(Please check answers)**

1) The Ka for acetic acid is 1.8e-5. What is the pH of a 3.18M solution of this acid? I did 1.8e-5 = x^2/3.18 x=sqrt 1.8e-5 X 3.18 = 7.56e-3 pH=-log(7.56e-3) = 2.12 The pH is 2.12 2) At 25 degrees celsius, the pH of a 1.75M NaCN solution (the Ka for HCN is 4.0e-10) is ? 4.0e-...
*April 1, 2012 by Hannah*

**Chemistry**

You are given an assignment to make 250ml buffer solution having 0.25M weak acid and 0.2M of its conjugate base. You have stock solutions 1.5M acid and 0.5M of the conjugate base. Clearly explain how you are going to make this buffer solution. Can anyone please help me!!!
*March 29, 2013 by Mary*

**Chemistry**

Identification of an unknown powdered metal by reaction with HCl: Why does the pH of the HCl solution initially increase very slowly when an unknown metal is first added to the acid solution, but gradually increase at a faster rate as the reaction proceeds to completion?
*October 6, 2013 by Ali*

**Chemistry**

The drug is a salt form while a molecular weight of 181.6G/mol. She needs a concentration of the stock solution of 100mM and she needs to make 1.2mL of the drug. How many grams will she need to weight out in order to make the stock solution?
*July 1, 2014 by Totally Lost*

**chemistry (buffer)**

If 5.00 mL of 1.60 nitric acid is added to a solution of 2.00 mmol thiocyanic acid (HSCN pKa=4.00) and 4.500 mmol calcium thiocyanide, assume a soluble salt- what is teh pOG of the resultant complex solution (of total volume .350L). I worked the problem out and ended up ...
*May 2, 2013 by rani*

**Chemistry**

Earlier I asked /display.cgi?id=1412727782 (tyvm btw) Say you have these A, B, and C solutions. Now you have an unknown colorless solution that contains either NaA, NaB, or NaC. In solution, each salt dissociates completely into the Na+ ion and the anion A-,B-, or C- (which ...
*October 7, 2014 by Gg*

**calculus**

Find the solution to the differential equation dy/dx = (x^3)/(y^2), where y(2) = 3 I have: The integral of: dy(y^2) = the integral of: dx(x^3) (y^3)/3 = (x^4)/4 The answer is supposed to come out to be y= the cube root of: ( 3/4x + 15 ) Thanks The general solution is (y^3)/3...
*May 6, 2007 by Suzie*

**Chemistry**

Hi, I posted yesterday with this lab question. "Calculate the molar amounts of NaOH used in the reaction with the HCl solution and with the HC2H3O2. I think I got the answer to that with the help that I received. I had 5 mL of HCl, and I was using .100 M NaOH, so I got 5x10-4 ...
*April 22, 2007 by Rachel*

**Statistics/Probability**

A certain brand of candies have a mean weigh of 0.8576 g and a standard deviation of 0.0523. A sample of these candies came from a package containing 447 candies,and the package label stated the net weight is 381.3 g. (If every package has 447 candies, the mean weight of the ...
*March 5, 2015 by slomomo*

**Chem II**

Which of the follwoing gives the molarity of 17.0% by mass solution of sodium acetate (molar mass = 82.0 g/mol) in water. The density of the solution is 1.09 g/mL. OK - I know that to figure molarity is moles divided by liters. This is confusing me because it is "17.0% by mass...
*June 4, 2008 by Ken*

**statistics **

in the spring of 2001, a university had 40,000 registered students. to estimate the percentage of all students expecting to graduate in 4 years, a simple random sample of 225 students was drawn, 144 of the sample planned to graduate in 4 years. (a) were the draws made with or ...
*May 8, 2014 by anonymous*

**chemistry**

An aqueous solution of silver nitrate contains 5.00 g of silver nitrate. To this solution is added sufficient barium chloride to precipitate all the silver as silver chloride. What mass, in grams, of dry silver chloride can be obtained?
*September 21, 2008 by Erika*

**science**

Q4.you will be asked to prepare 25.0 mL of a 0.019 M solution of sodium chloride during this experiment.... a.calculate mass of sodium chloride needed to prepare solution. (0.25L)(0.019M NaCl/L)*(58.5g NaCl/1mole NaCl)=0.278 g NaCl....is that right? someone just replied it was...
*September 17, 2009 by Ally*

**chemistry**

Consider the cell: (Pt) H2/H+ || (Pt) H+/H2. In the anode half-cell, hydrogen gas at 1.0 atm is bubbled over a platinum electrode dipping into a solution that has a pH of 7.0. The other half-cell is identical to the first except that the solution around the platinum electrode ...
*March 27, 2012 by Anonymous*

**Chemistry **

A galvanic (voltaic) cell consists of an electrode composed of aluminum in a 1.0 M aluminum ion solution and another electrode composed of fold in a 1.0 M gold (III) ion solution connected by a salt bridge. Calculate the standard potential for this cell at 25 degrees celcius.
*October 9, 2012 by Morgan *

**Biology**

Describe how you would prepare 10 mL each of 2 M, 1.5 M, and 1 M NaCl solutions from a 2 M stock NaCl solution. Describe your actions–exactly what you would do –step-by-step–when preparing this solution. Also show all calculations. Be sure all amounts include units of ...
*June 5, 2013 by Maria*

**Maths**

You have seven balls labelled 1,2,…,7 and seven unlabelled, indistinguishable boxes. How many different ways can the balls be placed into the boxes? Can anyone please work the complete solution. I got the answer but it was solved by my brother and he challenged me to get the ...
*June 25, 2013 by Satyam*

**CHEM**

Hydrogen peroxide (H2O2) is decomposed according to the following reaction: 2H2O2 (l) ¡÷ 2H2O (l) + O2 (g) If 6.00 g of aquesous solution containing hydrogen peroxide was decomposed after heating, the mass of oxygen gas collected is 2.40 g, what is the mass percentage of H2O2 ...
*December 30, 2014 by CHAN*

**Chemistry**

What is the mole fraction of methanol CH3OH, in the vapor phase from a solution consisting of a mixture of methanol and propanol CH3CH2CH2OH at 40celsius, if the total pressure above the solution is 131 torr? The vapor pressures of methanol and propanolare 303 and 44.60 torr ...
*April 23, 2011 by Jude*

**Chemistry**

Calculate the molarity of a solution made by adding 28.2 mL of concentrated ammonia (28.0 % by mass, density 0.880 g/mL) to some water in a volumetric flask, then adding water to the mark to make exactly 500 mL of solution. (It is important to add concentrated acid or base to ...
*October 7, 2013 by Sarah*

**Algebra I**

Describe the set of all values indicated by the set {a:-4 < a is greater than or equal to 1}. Beth has $417 available to buy trees for her yard. She will buy the trees from Tim’s Trees & Landscaping, where they cost $37 each. Letting t represent the number of trees she buys...
*August 1, 2010 by stephaine *

**AP Chemistry**

(a) When 300.0 milliliters of a solution of 0.200 molar AgNO3 is mixed with 100.0 milliliters of a 0.0500 molar CaCl2 solution, what is the concentration of silver ion after the reaction has gone to completion? (b)Write the net cell reaction for a cell formed by placing a ...
*April 5, 2010 by Jessica*

**math riddle**

Estimate a population: To study a species of fox, a team captures and tags 25 foxes from a large forest and then releases them. The following week they capture 15 foxes and find 5 are tagged. Estimate the number of foxes in the forest. This is a proportion problem. We know ...
*September 8, 2006 by christine*

**chemistry**

I have the answers, I am just interested in the formulas so that I can solve the problems, thanks! 1. Find the boiling point of a solution composed of 110g of HgCl2 (a non-ionizing solute) in 175g of water. 2. Find the freezing point of a solution composed of 50g IBr in 120 g ...
*April 15, 2014 by lisa*

**Statistics**

the international olympic committee states that the female participate in the 2004 Summer Olympic Games was 42%, even with the new sports for women such as weight lifting, hammer throw, and modern pentathalon being added to the Games. Broadcasting and clothing companies want ...
*April 12, 2010 by Crystal*

**physical science**

Does not settle on standing: I answered homogeneous mixture - solution and compound is this correct? Can seperate when allowed to stand alone I answered heterogenous mixture * choices solution, compund, heterogenous mixture and homogeneous mixture
*October 6, 2007 by liz*

**Chemistry**

Pure acetic acid, known as glacial acetic acid, is a liquid with a density of 1.049 g/mL at 25°C. Calculate the molarity of a solution of acetic acid made by dissolving 10.00 mL of glacial acetic acid at 25°C in enough water to make 150.0 mL of solution.
*February 17, 2010 by Mindy*

**Chemistry**

I am trying to figure out how to make 275 gallons of a 5% NaOH solution. I know that 275 gallons weighs 2294.875 lbs. How many lbs. of NaOH woul it take to make the above mentioned solution?
*August 27, 2012 by Jay*

**Math**

If someone could help me with these that would be great! :) Directions: Solve the equations. 1.) tan4x=1 Location on Unit Circle: Period: General Solution: 2.) sec xcsc x=2 csc x Location on Unit Circle: Period: General Solution:
*January 25, 2015 by Stephanie*

**writing**

Where can I find a sample or example of a process paragraph.
*May 29, 2008 by China*

**Business**

where can i find an sample of an blank order form?
*June 9, 2008 by Bryan*

**it**

i need an sample of a project management contengency plan
*October 26, 2008 by art*

**science**

can carbon disulphide dissolve a sulphur sample
*February 17, 2009 by seymone*

**statistics**

If a sample of size 30 is selected, the value of A for the probability p(t¡Ý A)= 0.01 is?
*August 1, 2009 by Lina*

**statistics**

What is the value for for a 95% confidence interval for the sample variance when n=10?
*August 25, 2010 by damian*

**chemistry**

How many moles of carbon dioxide are in a 175 g sample.
*September 22, 2010 by Betty*

**hcc**

find sample variance and standard deviation.8,45,16,50,34,25,32,31,30,27.s^2=
*March 13, 2011 by chelsea*

**chemistry**

A 10.00g sample of a mixture of CH4 and C2H4react with O2
*March 14, 2011 by Aly*

**statistics**

is it unusual for the mean of a sample 3 to 115 or more?
*September 30, 2011 by Tremyle*

** analysis **

What is meant by the sample space for a random experiment?
*May 17, 2012 by Kasey*

**chemistry**

determine the mass of FeSO4 in sample Y that you use
*August 2, 2012 by methove*

**Chemistry**

How many molectules are in a 64.3 mg sample of tetraphosphorus decoxide, P4O10?
*November 4, 2012 by Anonymous*

**statistics**

90% confidence; the sample size is 1150 of which 40% are successes.
*November 7, 2012 by Eva*

**Chemistry**

a sample of silver chromate has a mass of 78.6 grams?
*January 28, 2013 by david*

**science**

a 15-g sample of a material has a volume of 1.3cc. what is its density
*February 13, 2013 by Anonymous*

**chemistery**

How many grams of (NH4)2S2O3 were in the fertilizer sample
*March 20, 2013 by dug*

**Chemistry**

How many moles of iron atoms does a 27 g sample contain?
*June 30, 2013 by RAID*

**Chem**

How do I determine the percent of a compound in an impure sample?
*January 27, 2014 by Anonymous*

**Chemistry**

What is the activity of a 18.9 μCi sample of carbon-14 in becquerels?
*April 19, 2014 by ACDub*

**math**

Let x1,x2,x3 be random sample of normal(6,4), find P(max{x1,x2,x3}>8)
*December 28, 2014 by assma*

**math**

Let x1,x2,x3 be random sample of normal(6,4), find P(max{x1,x2,x3}>8)
*December 28, 2014 by assma*

**math**

Let x1,x2,x3 be random sample of normal(6,4)(x+1)/2,-1<x<1,find P(max{x1,x2,x3}>8)
*December 28, 2014 by assma*

**math**

Let x1,x2,x3 be random sample of f(x)=2x,0<x<1,zero elsewhere find P(x1/x2<0.5)
*December 28, 2014 by assma*

**Statistics**

1. A study of 40 people found that they could do on the average15 pull ups with a standard deviation of .6. Find the 99% confidence interval for the mean of the population. 2. A study of 50 pizza delivery workers found that they could make 6 deliveries per hour with a standard...
*May 3, 2013 by Cam*

**chemistry**

We are doing a lab that requires finding the molarity of an unknown AgNO3 solution after reacting NaCl + AgNO3 --> NaNO3 and AgCl and collecting/massing the precipitate. We will be using 10.00 mL of an NaCl solution and 10.00 mL of the AgNO3 solution. We know that the AgNO3...
*October 4, 2006 by Chris*

**Statistics**

data from sample of 400 cases, variable has 95% confidence interval of 54.3 to 54.7 I found the mean- how do i find standard error- step by step please. Standard error = sd/√n Note: sd = standard deviation; n = sample size. You'll need to determine the standard deviation...
*April 10, 2007 by Angel*

**economics 6**

Annual per capita consumption of milk is 21.6 gallons (Statistical Abstract of the United States: 2006). Being from the Midwest, you believe milk consumption is higher there and wish to support your opinion. A sample of 16 individuals from the mid western town of Webster City ...
*September 4, 2014 by Mia*

**Economics. (6)**

Annual per capita consumption of milk is 21.6 gallons (Statistical Abstract of the United States: 2006). Being from the Midwest, you believe milk consumption is higher there and wish to support your opinion. A sample of 16 individuals from the mid western town of Webster City ...
*September 5, 2014 by Vanessa*

**economics 6**

Annual per capita consumption of milk is 21.6 gallons (Statistical Abstract of the United States: 2006). Being from the Midwest, you believe milk consumption is higher there and wish to support your opinion. A sample of 16 individuals from the mid western town of Webster City ...
*September 5, 2014 by Mia*

**economics 6**

Annual per capita consumption of milk is 21.6 gallons (Statistical Abstract of the United States: 2006). Being from the Midwest, you believe milk consumption is higher there and wish to support your opinion. A sample of 16 individuals from the mid western town of Webster City ...
*September 7, 2014 by Alejandra*

**economics 6**

Annual per capita consumption of milk is 21.6 gallons (Statistical Abstract of the United States: 2006). Being from the Midwest, you believe milk consumption is higher there and wish to support your opinion. A sample of 16 individuals from the mid western town of Webster City ...
*September 7, 2014 by Mia *

**economics**

Annual per capita consumption of milk is 21.6 gallons (Statistical Abstract of the United States: 2006). Being from the Midwest, you believe milk consumption is higher there and wish to support your opinion. A sample of 16 individuals from the mid western town of Webster City ...
*September 8, 2014 by miguel*

**economics 6**

Annual per capita consumption of milk is 21.6 gallons (Statistical Abstract of the United States: 2006). Being from the Midwest, you believe milk consumption is higher there and wish to support your opinion. A sample of 16 individuals from the mid western town of Webster City ...
*September 8, 2014 by miguel*

**Economics 6**

Annual per capita consumption of milk is 21.6 gallons (Statistical Abstract of the United States: 2006). Being from the Midwest, you believe milk consumption is higher there and wish to support your opinion. A sample of 16 individuals from the mid western town of Webster City ...
*September 9, 2014 by Vanessa*

**General Chemistry**

"How would you prepare 150. mL of 0.1M sodium hydroxide given a stock solution of 3.0M NaOH?" I made calculations and figured the process would be to dilute 5 mL of the 3.0M NaOH to 150. mL. Is this correct? For the ideal 150. mL of 0.1M NaOH, I calculated there to need .015 ...
*April 21, 2013 by Emily*

**AP Chemistry**

A solution is prepared by mixing 0.0200 mol CH2Cl2 and 0.0500 mol CH2Br2 at 25°C. Assuming the solution is ideal, calculate the composition of the vapor (in terms of mole fractions) at 25°C. At 25°C, the vapor pressures of pure CH2Cl2 and pure CH2Br2 are 133 and 11.4 torr, ...
*March 22, 2010 by Sarah*

**chemistry**

A solution is prepared by mixing 0.0433 mol CH2Cl2 and 0.0623 mol CH2Br2 at 25°C. Assuming the solution is ideal, calculate the composition of the vapor (in terms of mole fractions) at 25°C. At 25°C, the vapor pressures of pure CH2Cl2 and pure CH2Br2 are 133 and 11.4 torr, ...
*May 4, 2010 by bob*

**Chemistry**

A solution is prepared by mixing 0.0400 mol CH2Cl2 and 0.0700 mol of CH2Br2 at 25°C. Assuming the solution is ideal, calculate the composition of the vapor (in terms of mole fractions) at 25°C. At 25°C, the vapor pressures of pure CH2Cl2 and pure CH2Br2 are 133 and 11.4 torr, ...
*February 20, 2011 by Katrina*

**chemistry**

Lactic acid, CH 3 CHOHCO 2 H, is found in sour milk, in sauerkraut, and in muscles after activity. K a for lactic acid = 1.4 x 10 -4 . a. If 2.75 g of NaCH 3 CHOHCO 2 , sodium lactate, is added to 5.00 x 10 2 mL of 0.100 M lactic acid, what is the pH of the resulting buffer ...
*April 23, 2014 by Anonymous*

**Chemistry**

The values of Ksp for silver bromide, AgBr is 7.7x10^-13, and silver chloride, AgCl is 1.6x10^-10. A solution containing a mixture of 2.0x10^-2 M Br^- and 2.0x10^-2 M Cl^- is a candidate for separation using selective precipitation. Solid AgNO3 is added without changing the ...
*July 27, 2010 by Sam*

**thermochemistry**

what is the mass of a lead block that if heated to 100.0 dgrs C and placed in a container with 50.0g of ice at 0.00dgrs C produces a final water sample of 15.0dgrs C? Sh of Pb= 0.128J/g dgrsC step by step solution and answer q1 for Pb block = mass x sp.h. x (Tf - Ti). mass Pb...
*April 11, 2007 by crystine cole*

**Algebra 116**

1. Solve using the Elimination Method. 2r - 7s = -57 7r %2B 2s = 39 What is the solution set ______? 2. Simplify -8[-90-(-60-14)]= ______ 3. Solve using the Substition Method. 5x %2B 7y = 41 x = 61 - 8y What is the solution _______? 4. On three consecutive passes, a football ...
*September 30, 2008 by MzMaria*

**Chemistry**

Can someone please check my answers for me for the following questions. THANK YOU! 1) An ion with an oxidation number of 3+ can combine with three other ions, if each of these ions has an oxidation number of....3- 2) The correct formula for nickel(II) chloride is...NiCl2 3) A ...
*July 30, 2007 by anonymous*

**Chemistry**

How does dissolving a solute affect the boiling point or freezing point of the solution? What about the solution's vapor pressure? Read about Raoult's Law, freezing point depression and boiling point elevation.
*March 6, 2007 by John*

**Chemistry**

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

**CHEMISTRY**

A solution of H2SO4(aq) with a molal concentration of 1.94m has a density of 1.119g/mL. What is the molar concentration of this solution? I got an answer of 2.17 M and it is incorrect..please help. My work: So Molar concentration = molal concentration * density = 1.94 mol/kg...
*February 18, 2012 by Akle*

**Math**

Hi! If someone can help me with these, that would be great! Thanks! Directions: Solve each equation. 1.) 2cosx+sqrt2=0 Location on Unit Circle: Period: General Solution: 2.) 3cot^2x-1=0 Location on Unit Circle: Period: General Solution:
*January 23, 2015 by Tammi*

**Chemistry**

how to prepare 100cm3 of 1.0moldm3 copper sulphate and from this prepare 100cm3 of 0.1 moldm3 solution.similarly use the 0.1moldm3 to prepare a 0.05 moldm3 ,and the 0.05moldm3 solution to prepare 0.01 moldm3 and 0.001moldm3solution.
*December 9, 2012 by Anonymous*

**Microbiology**

What is the preferred method of sterilization for heat-sensitive solution? In addition, note a heat-sensitive solution that can be sterilized using the method you noted. a. Preferred method: b. Example:
*September 26, 2014 by Rose*

**Chemistry;HELP**

Use the 5-step method and be sure to include units where appropriate. Round your answers to the correct number of significant digits. Mass m Density = -------------- or D = ------ Volume v Adjust the density formula and solve the problems below: m D = ------- Original Formula...
*January 16, 2013 by Victoria*

**Biology**

6. Describe and explain what would happen to a cell containing 100mM NaCl, 150 mM glucose, and 100 mM protein if placed into: a) distilled water? (describe the volume change if the cell were permeable to water only). b) a solution of 100mM NaCl, IF the cell were permeable to ...
*February 4, 2013 by .....*

**Chem**

You've just prepared a solution by transferring 20.0 g of glucose into a 1.0 - L volumetric flask, and adding water to the mark. Calculate the concentration of the glucose solution in terms of millimoles/Liter, mg/mL, and % (m/v). Ok, I think i'm overwhelmed by the wordinng of...
*September 7, 2009 by Britt*

**Chemistry**

Predict whether or not a precipitate will form upon mixing 75.0 mL of a NaOH solution with pOH = 2.58 with 125.0 mL of a 0.018 M MgCl2 solution. Identify the precipitate, if any. Express as a chemical rxn NaOH(aq) + MgCl2(aq) => NaCl(s) + MgOH(aq) I have to balacnce it and ...
*October 31, 2010 by Anonymous*

**chemistry**

I am still having trouble with this question It says What is the molarity of a solution containing 18.0g of KCl in 262mL of KCl solution? When I calculated it I got .92154 m. I had changed 18 g into moles and 262 ml into liters and then divided the moles into liters. I was ...
*November 7, 2013 by chelsea*

**Chemistry HELP ME!!!!**

A sloution of calcium nitrate, C(NO3), reacts with a solution of ammonium fluoride, NH4F, to form solid calcium fluoride, CaF2, and ammonium nitrate, NH4NO3(ag). When 45.00 mL of 4.8724 x 10 -1M Ca(NO3)2 solution was added to 60.00 mL of 9.9981 x 10 -1M NH4F solution, 1.524g ...
*February 10, 2010 by Macey*

**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 24, 2010 by stan*

**urgent i need help within an hour!**

Ascorbic acid (vitamin C, C6H8O6) is a water-soluble vitamin. A solution containing 83.3 g of ascorbic acid dissolved in 210. g of water has a density of 1.23 g/mL at 55°C Calculate the molarity of ascorbic acid in this solution. i got 2.77 but its wrong
*January 21, 2013 by Samantha*

**chemistry**

A solution containing silver (I) ion (an oxidizing agent) is mixed with a solution containing iron (II) ion (a reducing agent). a. What is the balanced equation? b. If the contents of the reaction mixture described above are filtered, what substances, if any, would remain on ...
*January 1, 2010 by anonymous*

**chemistry**

A solution containing silver (I) ion (an oxidizing agent) is mixed with a solution containing iron (II) ion (a reducing agent). a. What is the balanced equation? b. If the contents of the reaction mixture described above are filtered, what substances, if any, would remain on ...
*January 1, 2010 by anonymous*

**AP chemistry**

A solution of sodium hydroxide is standard- ized against potassium hydrogen phthalate (KHP, formula weight 204.2 g/mol). From the following data, calculate the molarity of the NaOH solution: mass of KHP 1.894 g; buret reading before titration 0.13 mL; buret reading after ...
*October 24, 2010 by Anonymous*

**Chemistry**

A solution of sodium hydroxide is standard- ized against potassium hydrogen phthalate (KHP, formula weight 204.2 g/mol). From the following data, calculate the molarity of the NaOH solution: mass of KHP 1.654 g; buret reading before titration 0.23 mL; buret reading after ...
*October 4, 2011 by Broy*

**Chemistry**

In the following experiment, a coffee-cup calorimeter containing 100. mL of H2O is used. The initial temperature of the calorimeter is 23.0 degrees C. If 3.80 g of CaCl2 is added to the calorimeter, what will be the final temperature of the solution in the calorimeter? The ...
*June 21, 2012 by Abby*

**chemistry**

A solution of sodium hydroxide is standard- ized against potassium hydrogen phthalate (KHP, formula weight 204.2 g/mol). From the following data, calculate the molarity of the NaOH solution: mass of KHP 1.744 g; buret reading before titration 0.13 mL; buret reading after ...
*September 19, 2012 by cheri*

**please help analytical chemistry**

50 ml of a .1103M solution of formic acid is titrated with a .2511M NaOH. a) What is the pH before and NaOH is added? b) How many mL of NaOH solution must be added to reach the equivalence pt? c) what is the pH at the equivalence pt of the titration? d) If the titration is ...
*April 8, 2013 by Lana*

**chemistry**

A 1 m solution of MgCl2 will cause the decrease in the freezing point of water to be approximately ___ than that caused by a 1 m solution of sucrose a. 3x kleiner/ 3x smaller b. 2x kleiner / 2x smaller c. dieselfde / the same d. 2x groter / 2x greater e. 3x groter / 3x greater...
*August 1, 2010 by Megan*

**College Chemistry**

Substances A, B, and C can all act as oxidizing agents. In solution, A is green, B is yellow, and C is red. In the reactions in which they participate, they are reduced to A-, B-, and C- ions, all of which are colorless. When a solution of C is mixed with one containing A- ...
*November 10, 2010 by Lisa*