Friday

November 27, 2015
Number of results: 28,953

**science(chem)**

How would I make a 5% solution of sodium bisulfite? sodium bisulfite: NaHSO3 Molar mass: 104.06 g/mol is it 5% w/w or v/v or w/v b/c if it was w/w then it would be weight percent w/w= weight solute/ weight solution* 100 I need help on this Thanks
*November 4, 2007 by ~christina~*

**Chem6**

A solution contains naphthalene dissolved in hexane at a concentration of 10.40% naphthalene by mass. Calculate the vapor pressure of hexane above the solution, given that the vapor pressure of pure hexane at this temperature is 151 torr.
*May 2, 2011 by Ryan*

**Probability and Statistics 2**

Minute Maid orange juice company claims that 25% or more of all orange juice drinkers prefer its product. To try to disprove the validity of this claim, Tropicana orange juice company sample 200 orange juice drinkers and found that 41 prefer the Minute Maid brand. At a=0.5 ...
*April 29, 2012 by Kim*

**Chemistry**

A solution contains 3.75g of nonvolatile pure hydrocarbon in 95g acetone. The boiling points of pure acetone and the solution are 55.95C and 56.50C, respectively. The molal boiling point constant of acetone is 1.71 C*kg/mol. What is the molar mass of the hydrocarbon?
*February 10, 2011 by James*

**help with chem biochem **

Ethanol + NAD+ acetaldehyde + NADH + H+ You have a 1 ml solution containing 100 uM Ethanol, and 1 mM NAD+. You then add 1 mg of alcohol dehydrogenase. Assume all of the ethanol gets converted to acetaldehyde. a) What will the final concentration of NADH be in the ...
*September 11, 2013 by tracy*

**Chemistry**

I need to figure out the molarity in the problem. A) 3.60g of sulfuric acid in 450.0mL of solution I was going to take 3.60 / 450.0mL = 0.008 B) 2.0 x 10-3 mol Iron(II)nitrate in 12.0mL of Solution 10 *3=30 then I was going to take 30*2.0 =60 60/12.0= 5 I am not sure if this ...
*March 8, 2015 by Leslie Hill*

**math**

Hi, I am trying to solve a problem using Chebyshev's Theorem. The problem says that: A large sample of Northern Pike caught at Taltson Lake (Canada) showed that the average length was x (mean)=32.5 inches with sample standard deviation s=8.6 inches. a.) Compute the ...
*May 26, 2009 by Stella*

**Chemistry**

Hello, i seem to be stuck on a problem and do'nt know why im not gettin the right answer.I have the he Ka and Kb values for each of the weak acids and bases from the chart and I keep getting zero and the second one 2.27*10^-24 is this correct?? Thank uu Solve an equilibrium ...
*March 24, 2011 by Amy Wight*

**Chemistry**

Hello, i seem to be stuck on a problem and do'nt know why im not gettin the right answer.I have the he Ka and Kb values for each of the weak acids and bases from the chart and I keep getting zero and the second one 2.27*10^-24 is this correct?? Thank uu Solve an equilibrium ...
*March 24, 2011 by Amy Wight*

**Chemistry**

Hello, i seem to be stuck on a problem and do'nt know why im not gettin the right answer.I have the he Ka and Kb values for each of the weak acids and bases from the chart and I keep getting zero and the second one 2.27*10^-24 is this correct?? Thank uu Solve an equilibrium ...
*March 24, 2011 by Amy Wight*

**CHEMISTRY**

cell diagram:H2(g,1atm) Pt Enter part(a), (c) with 2 siginificant digits and part(b) with 3 siginificant digits. Enter scientific notation as 1.23E4. (a) What is Ecell if the unknown solution in the half-cell on the left has pH = 4.94? ____________ (b) What is Ecell if the ...
*November 30, 2012 by sabrina*

**Calculus**

Consider the solid that lies above the square (in the xy-plane) R=[0,2]*[0,2], and below the elliptic paraboloid z=100−x^2−4y^2. (A) Estimate the volume by dividing R into 4 equal squares and choosing the sample points to lie in the lower left hand corners. (B) ...
*April 14, 2010 by Salman*

**Chemistry**

1. What is the pH of a solution whose [H3O+] is 1 X 10 -5 M? 2. What is the [H3O+] concentration of a solution with a pH of 9? 3. What is the pH of a solution whose [H3O+] concentration is 3 X 10-3 M? 4. What is the pH of a solution with a [H3O+] concentration of 1 X 10 -12 M...
*March 27, 2012 by John*

**Need your help!!!! Plzzzz (literacy)**

I was ask by my literacy professor to find a sample unit plan that focuses on animals that live in the water/oceans/seas. The unit should include what the animals eat? How they survive underwater? How they move underwater? (amoung other things) She also wants the sample unit ...
*March 23, 2008 by Ashley*

**Gen CHEM 2**

I need to produce a buffer solution that has pH 5.28. I have already 10 mmol of acetic acid. How much solid sodium acetate will i need to add to this solution? pKa of acetic acid is 4.74. I plugged in all my info to the Hendersen/Hasslebalch equation but I keep getting the ...
*February 11, 2008 by Jessica*

**Chemistry**

Which of the following solution should be mixed with 50.0 mL of 0.050 M HF solution to make an effective buffer? A) 50.0 mL of 0.10 M NaOH B) 25.0 mL of 0.10 M NaOH C) 50.0 mL of 0.050 M NaOH D) 25.0 mL of 0.050 M NaOH
*April 1, 2012 by Anon*

**chemistry**

How many grams of PbBr2 will precipitate when excess FeBr2 solution is added to 47.0 mL of 0.563 M Pb(NO3)2 solution? Pb(NO3)2(aq) + FeBr2(aq) PbBr2(s) + Fe(NO3)2(aq)
*March 3, 2014 by kammy*

**Chemistry**

Colligative Properties The freezing point of distilled water was determined by recording a thermogram: -0.176 degrees Celsius. The freezing point of a 0.200 m (molality) solution containing an unknown, ionic compound was determined by recording a second thermogram: -.904 ...
*January 28, 2014 by Sam*

**Math**

What is a "sample space" when you are listing outcomes? Pls respond! http://www.google.com/search?as_q=&hl=en&num=10&btnG=Google+Search&as_epq=sample+space&as_oq=&as_eq=&lr=&as_ft=i&as_filetype=&as_qdr=all&as_nlo=&as_nhi=&as_occt=title&as_dt=i&as_sitesearch=&as_rights=&safe=...
*May 8, 2007 by Hi*

**Chemistry**

When 23.3 mL of 0.14 M HCl are added to 50.0 mL of a 0.16 M solution of a weak monoprotic base, the pH of the solution is 10.50. What is the Kb of the weak base? do u find moles of both and then add the moles for HB+ and then just use the B- moles for the B on the henderson ...
*March 8, 2009 by Chris*

**Gen Chemistry**

52.8 mL of a calcium chloride solution with unknown concentration was treated with phosphoric acid to remove all of the calcium ions in the form of a precipitate. The precipitate was filtered, dried and was found to have the mass of 3.9565 g. What was the concentration of the ...
*December 11, 2010 by Kevin*

**Chemistry ...ASAP please**

a ferric phosphate solution is prepared by adding 2.4 g of ferric phosphate to a volumetric flask and bringing the final volume to 1.00L by adding water having a phosphate concentration of 1.0 mg/L. what is the concentration of soluble iron in this solution? (Temperature is 25C)
*January 23, 2011 by medina*

**Chemistry**

The vapor pressure of pure acetone (propanone) is 266 torr. When a non-volatile solute is added, the vapor pressure of acetone above the solution falls to 232 torr. What is the mole fraction of acetone in the solution? Show work. A) 0.69 B) 0.32 C) 0.13 D) 0.045 E) 0.87
*February 27, 2013 by Dee*

**algebra 1**

Inequality 3 | 2x-2 | +16<58 •simplify as much as possible without moving the absolute value sign •rewrite the inequality as two inequalities with out absolute value signs• find solution set of the inequality and graph solution set on a number line
*June 3, 2013 by karina c*

**chemistry**

A buffer solution contains 0.283 M hypochlorous acid and 0.456 M potassium hypochlorite. If 0.0464 moles of perchloric acid are added to 225 ml of this buffer, what is the pH of the resulting solution ? (Assume that the volume change does not change upon adding perchloric acid...
*July 2, 2014 by Curtis *

**Chemistry**

How many milliliters of 0.258 M NiCl2 solution are needed to react completely with 20.0 mL of 0.153 M Na2CO3 solution? How many grams of NiCO3 will be formed? The reaction is Na2CO3(aq) +NiCl2 (aq)----> NiCO3(s)+2NaCl I solved for the 1st part, 11.8 M NiCl2 I am not sure ...
*March 22, 2015 by Stacie*

**Chemistry**

How many liters of 12.3 molar NaOH stock solution will be needed to make 12.4 liters of a 1.2 molar NaOH solution?
*May 1, 2011 by Lindsey*

**Algebra**

2. Find the value of x^3 + 2x^2 - 3 when x=3 Answer-42 4. Compare the quantity in Column A with the quantity in Column B. Column A Column B The solution of The solution of 2(x-3) = 6x 3x + 2 + 5x + 6
*August 7, 2011 by lizzie*

**chemistry**

Calculate the value of the [Fe3+]/[Fe2+] if 3 cm3 of the 0.05 M Fe3+ solution is added to 25 cm3 of the 0.05 M Fe2+ solution
*September 23, 2015 by ronika kumar*

**Chemistry**

When copper wire is placed into a silver nitrate solution, silver crystals and copper(II) nitrate solution form. If 57.1 g silver is actually recovered from the reaction, determine the percent yield of the reaction.
*February 11, 2011 by Anonymous*

**chemistry**

enzoic acid is a weak monoprotic acid with Ka = 6.5×10-5 M. NaOH(s) was gradually added to 1.00 L of 8.66×10-2 M benzoic acid. 1. Calculate the pH of the solution before the addition of the base. 2. Calculate the pH of the solution after the addition of 5.20×10-2 mol of NaOH(s).
*March 25, 2014 by bekah*

**Science**

What is a standard for comparison, a sample you are not experimenting on?
*August 25, 2009 by Tonya*

**math**

a sample that is not representative of the entire population
*March 8, 2010 by taylor*

**Chemistry**

what was the first sample in the ChemQuandry and where is it used
*February 23, 2011 by Jessica*

**BAA **

Is there a sample Black adievement award?????
*December 5, 2011 by Laruen *

**chemistry**

How many water molecules are in a 0.265 g sample?
*December 20, 2011 by troy*

**science**

How many moles are in a 12.0 g sample of iron (II) oxide
*April 16, 2012 by Yamilet*

**chemistry**

calculate the percentage of FeSO4 in sample Y
*August 2, 2012 by methove*

**chemistry**

A sample of orange juice has a pH of 3.44. Its [H3O+] is
*October 24, 2012 by Anonymous*

**Chemestry**

How many moles of NaHCO3 are in a 44g sample?
*January 28, 2013 by Douglas*

**chemistry**

How many Cl atoms are in a 2.54g sample of CCl4?
*April 6, 2013 by Sarah*

**PM**

What is a home builders sample work package
*August 15, 2013 by kim*

** Chem**

A radioactive isotope sample has a hal
*December 6, 2013 by Lulu*

**chemistry**

what is the mass of oxygen in a 5.6 g sample of Al(NO3)3.
*September 9, 2014 by taylor*

**chemistry**

How many grams of O2 are contained in a 25.0L sample at 5.20 atm and 28.0C?
*November 13, 2014 by mariah*

**Statistics**

What is the sample variance (not the population estimate) for: 1, 1, 2, 3, 5, 8.
*February 24, 2015 by Alicia Estrada*

**stats**

A sample has a mean of M = 73 and a standard deviation of s = 5
*June 18, 2015 by dj*

**chemistry**

Please judge my answer: Question: 24 mL of 0.39 mol/L acetic acid is titrated with a standardized 0.33 mol/L KOH solution. Calculate the pH of the solution after 17 mL of the KOH solution has been added. Assume the Ka of acetic acid is 1.8 x 10-5. Answer: The equation for this...
*April 15, 2008 by Abigail*

**chemistry**

a student synthesized 6.895g of barium iodate monohydrate, Ba(IO3)2.H2O, by adding 30.00 mL of 5.912*10^-1M barium nitrate, Ba(NO3), to 50.00 mL of 9,004*10^-1 M sodium iodate, NaIO3 (1) write the chemical equation for the reaction of solutions of barium nitrate and sodium ...
*March 1, 2010 by aymal*

**Statistics**

Waste Today Services operates a garbage hauling company in a South Jersey city. Each year, the company must apply for a new contract with the city. The contract is in part based on the pounds of garbage hauled. Part of the analysis that goes into the contract development is an...
*April 4, 2012 by Walter*

**Statistics **

In the third week of July, a random sample of 61 farming regions gave a sample mean of = $6.88 per 100 pounds of watermelon. Assume that is known to be $1.72 per 100 pounds. A farm brings 30 tons of watermelon to market. Find a 98% confidence interval for the population mean ...
*July 7, 2012 by Desperate *

**chemistry**

What is the concentration of NaOH? using this solution (0.04756 M (i think its stand for Molarity) H2SO4) what is the concentration of NaOH in 10.00 ml of a solution, titrate to an end point using 24.22 ml of acid? formula that was given is (H2SO4 + 2NaOH --> Na2SO4 (aq) + ...
*March 16, 2012 by star*

**chemistry**

Sodium bicarbonate is often used to neutralize acids, such as the following reaction: NaHCO3 + HCl ---> NaCl + H20 + CO2. What is the normality of a sodium bicarbonate solution containing 5.08 g NaHCO3 in 150.0 mL solution? this chapter in chemistry is really confusing and ...
*April 7, 2013 by Patricia*

**chemistry step by step for me clearly**

Al2(s04)3 solution of a molal concentration is present in 1 litre solution of 2.684g/cc. How many moles of bas04 would be precipitated on adding bacl2 in excess. The answer 6M I want some tutors to explain for me step by step clearly. I do not still understand Thank a lot all ...
*July 12, 2014 by ken*

**Chemistry**

A weighed amount of sodium chloride is completely dissolved in a measured volume of 4.00 M ammonia solution at ice temperature, and carbon dioxide is bubbled in. Assume that sodium bicarbonate is formed until the limiting reagent is entirely used up. The solubility of sodium ...
*February 25, 2015 by JUNDY*

**math**

Could someone check these questions for me? Please? My answers are under the questions... Questions~ 1. Solve: | x | = 6 |6|=6 and |-6|=6 x must be 6 or -6 2. Solve: | x + 7 | = 12 (x+7)=12 and -(x+7)=12 x+7=12 and -x-7=12 x= 5 and -19=x The the solution is x = {–19, 5} 3. ...
*October 2, 2015 by Abby *

**chemistry**

Can Anyone Help Me With This Solubility Problem? An aqueous solution of 1.90 M AgNO3 is slowly added from a buret to an aqueous solution of 0.0100 M Cl- and 0.250 M I-. a) Which ion, Cl- or I-, is the first to precipitate? b) When the second ion begins to precipitate, what is ...
*April 21, 2010 by anonymous*

**chemistry**

assume you had a solution that contained a mixture of a silver ions and stronium ions. come up with three different reaction plans that would allow you to precipitat either the silver ion or strontium ion, but the other ion would remain in solution
*December 1, 2011 by Colby*

**Algebra**

1.Is (0,3) a solution to the equation y=x+3? A.yes*** B.No 2.Is (1,-4) a solution to the equation y=-2x? A.yes B.No*** 3.Look at the following points (4,0),(3-1),(6,3)(2,-4) Which are solutions to y=x-4?chose all correct answers A.(6,3) B.(4,0) C.(3,-1)*** D.(2,-4)*** 4.There ...
*August 31, 2015 by GummyBear*

**Statistics**

Problem 1 Use the Old Faithful data labelled Duration as a sample for problem 1. a. Determine the proportion of instances that the duration was less than 240 seconds. Also express the proportion as a percent. (hint: proportion is number of successes divided by total number. b...
*July 12, 2012 by Anonymous*

**Chemistry**

Then calculate the inital ClO^- concencentrations for 1st, 2nd, and 3rd reactions. Calculate [ClO^-] in a 6% bleach solution. A 6% bleach solution contains 6 grams of NaClO per 100 grams bleach. The density of 6% bleach is 1.07g/mL. Chemical reaction: Blue dye + ClO^- -->...
*February 28, 2012 by Cassandra*

**chemistry**

A 0.15M solution of weak triprotic acid is adjusted (base added) so that the pH is 9.27(you can assume minimal volume change). The triprotic acid(H3A) has the following acid ionization constants: Kal=1.0*e-3, ka2=1*e-8,ka3=1*e-12. which species given below is present in the ...
*May 13, 2011 by vivanh*

**Chemistry**

A volume of 60.0 of aqueous potassium hydroxide (KOH) was titrated against a standard solution of sulfuric acid (H2SO4). What was the molarity of the KOH solution if 25.2 mL of 1.50M H2SO4 was needed? The equation is 2KOH+H2SO4-->K2SO4+2H2O. I cant seem to get the right ...
*June 25, 2011 by Paris*

**Soil Science!**

Given the following soil properties, find the % of water by weight at soil saturation with water: Moist sample weight: 202.16 Oven dry sample weight: 197.8 Bulk Volume:118.86 Particle Volume Density: 73.73 Soil bulk density: 1.66 soil particle density: 2.68 % pore space: 38.06...
*October 7, 2014 by Udyr*

**Soil Science, HELP!!**

Given the following soil properties, find the % of water by weight at soil saturation with water: Moist sample weight: 202.16 Oven dry sample weight: 197.8 Bulk Volume:118.86 Particle Volume Density: 73.73 Soil bulk density: 1.66 soil particle density: 2.68 % pore space: 38.06...
*October 8, 2014 by Trenton*

**Chem**

I am doing a lab concerning pH... Why is it necessary to allow a mixture of 25mL of a 0.1M HCl solution with 20mL of a 0.08M NaOH solution to cool to room temperature? (I don't know if the actualy concentrations matter) Does it affect the pH? Yes, temperature affects the pH ...
*March 7, 2007 by Marisol*

**chemistry 12**

If the pH of a solution is 3.5, what colour will be shown by each of the following indicators in the solution? a)Methyl Violet b) methyl red c) Methyl orange d) phenolphthalein My answers: a) Yellow to Blue b) Red to Yellow c) Red to Yellow d) close to a light pink almost ...
*October 13, 2011 by Sarah*

**Statistics**

It is known that the amount of time needed to change the oil in a car is normally distributed. A random sample of 100 oil changes yielded a sample mean of 22 minutes and a standard deviation of 5 minutes. Then compared to the interval estimate for the previous question. This ...
*February 26, 2007 by Jason L*

**business math**

Question: You receive the results of a paired-comparison preference these of four soft drinks from a sample of 200 persons. The results are as follows: Koak Zip Pabze Mr.Pep Koak ---- 50 115 35 Zip 150 --- 160 70 Pabze 85 40 --- 45 Mr.Pep 165 130 155 --- a). How does these ...
*December 1, 2007 by george*

**AP Chemistry**

Assume that 30.0 mL of a 0.10 M solution of a weak base B that accepts one proton is titrated with a 0.10 M solution of a monoprotic strong acid HX. (a) How many moles of HX have been added at the equivalence point? (b) What is the predominant form of B at the equivalence ...
*March 8, 2010 by Sally Perez*

**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 ...
*January 16, 2013 by Victoria*

**equilibrium concentration**

A standard solution of FeSCN2+ is prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN. The equilibrium concentration of FeSCN2+ ([FeSCN2+]std) for this standard solution is assumed to be ? M. Wouldn't that be 0.002 x 1/11 = ??
*April 4, 2007 by Christine*

**CHEM**

Calculate the vapor pressure at 25 C of hexane above the solution. The vapor pressure of pure hexane at 25 C is 151 torr. A solution contains naphthalene ({\rm{C}}_{10} {\rm{H}}_8) dissolved in hexane ({\rm{C}}_6 {\rm{H}}_{14}) at a concentration of 12.17 \% naphthalene by mass.
*June 5, 2010 by AMI*

**math**

6.22 A study of the Consideration of Future Consequences(CFC) scale found a mean score of 3.51, with a standard deviation of 0.61, for the 664 students in the sample(Petrocelli, 2003). For the sake of this exercise, let’s assume that this particular sample comprises the entire...
*October 12, 2013 by eid2013*

**statistics **

A study of the Consideration of Future Consequences(CFC) scale found a mean score of 3.51, with a standard deviation of 0.61, for the 664 students in the sample(Petrocelli, 2003). For the sake of this exercise, let’s assume that this particular sample comprises the entire ...
*October 14, 2013 by eid2013*

**math**

A study of the Consideration of Future Consequences(CFC) scale found a mean score of 3.51, with a standard deviation of 0.61, for the 664 students in the sample(Petrocelli, 2003). For the sake of this exercise, let’s assume that this particular sample comprises the entire ...
*October 14, 2013 by eid2013*

**business**

wall street journal provides the net asset value, the year to date percent return, and the three year percent return for 555 mutual funds will be selected for a follow up study on the size and performance of mutual funds. Use the forth column of the randon numbers in Table 7.1...
*October 29, 2013 by Anonymous*

**math**

Determine whether the ordered pair is a solution of the inequality (5, 12); 6y-7x.7 Is the ordered pair a solution of the inequality? no or yes solve the system of equations by graphing. Then classify the system as consistent or inconsistent and the equations as dependent or ...
*July 14, 2008 by mekhi*

**chemistry**

Where can I find the answers to these questions in my text, "fundamentals of analytical chemistry" by skoog, west, holler and crouch. 1. Why is acetylsalicylic acid analyzed using back titration? 2. Discuss the importance of simmering the tablet in the NaOH solution for 20 ...
*July 14, 2007 by smiley*

**math**

A random sample was taken from the normal IQ population, which has μ = 100 and σ = 15. ALL INFORMATION IS GIVEN: We gave a random sample of 25 undergrad students (n = 25) a new study pattern to see if it increases their IQ score. The samples mean IQ score is 112. The...
*July 9, 2014 by joseph*

**math**

random sample of 9600 students. Multistage design effect similar to an SRS (for those still in school) 46% had at least one parent who was a college graduate. Estimate with 99% confidence the proportion of all students who had at least one parent who was a college grad. b) ...
*April 2, 2013 by Please Help*

**math check and help**

A certain population has a mean of 472 and a standard deviation of 40. Many samples of size 46 are randomly selected and the means calculated. (a) What value would you expect to find for the mean of all these sample means? (Give your answer correct to nearest whole number.) ...
*June 16, 2013 by Sue 72*

**Stats**

A test of hypothesis is performed to determine whether the proportion of Montrealers (population 1) who want the decriminalization of marijuana is greater than the proportion of Torontonians (population 2) who want decriminalization of marijuana. A random sample of 120 ...
*November 17, 2013 by Emile*

**algebra final, please help**

Solve (x+17)(x-20)(x+8)>0 The solution set is (x )? Use at least one inequality or compound inequality to express your answer. For answers with more than one inequality, separate the inequalities by a comma or the word 'or'. Type R is the answer is all real numbers. Type N ...
*March 21, 2008 by Becky*

**Chemistry**

A standard solution of FeSCN2+ is prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN. The equilibrium concentration of FeSCN2+ ([FeSCN2+]std) for this standard solution is assumed to be ____ M. I tried this problem by adding the moles of Fe(NO3)3 and ...
*April 13, 2008 by Renee*

**chem**

A solution of Acetic acid has a light red color in the presense of the indicator orange IV. When sodium acetate is added to the solution, the color changes to yellow. Explain the reaction which causes the color change. I have no idea. Does it have to do with the sodium added? ...
*April 29, 2009 by Joyce*

**Chemistry**

could someone help me with this question? A quantity of 400 mL of .6 M HNO3 is mixed with 400 mL of .3 M Ba(OH)2 in a constant pressure calorimeter of negligible heat capacity. The initial temperature of both solutions is the same at 18.46 degrees Celsius. What is the final ...
*April 25, 2010 by Tokey*

**Science (chemistry) help please**

The following data was obtained from titrating a solution containing 25 mL of 0.0100 M MgCl2 solution, 1 mL of NH3OH buffer, and 10 drops of Calmagite with EDTA. Calculate the concentration of EDTA. Report the answer with three sig figs. I don't know what to do? I know that 0....
*May 14, 2013 by andy*

**Chemisry**

What is the % M/M concentration of 5.00 mL of methanol in 25 g solution of methanol in water? The density of methanol is 0.791 g/mL. The density of water is 1.000 g/mL. The density of the solution is 0.995 g/mL. Please show work, thank you!
*February 23, 2013 by Rena*

**Chemistry**

A geologist removes a sample of water from a lake in Nevada where the water level has been slowly dropping over time. The sample is found to be 0.02M in borax. The lake is circular in shape and is currently 500 meters in diameter and 50 meters deep. Using the given data ...
*April 30, 2012 by Jematormal91*

**chemistry**

A solution is made by dissolving 46.5g of urea, (CH4N2O) a nonelectrolyte, in 316g of water. Calculate the vapour pressure of this solution at 40 oC. (ans in torr, note the vapour pressure of pure water at 40 oC is 55.3 torr.) I have been struggling with this equation for over...
*February 17, 2011 by wini*

**AP Chemsitry**

A solution of an unknown monoprotic weak acid was titrated with 0.100 M NaOH. The equivalence point was reached when 37.48 ML of base had been added. From a second buret, exactly 18.74 of 0.100 M HCl were added to the titration solution. The pH was then measured with a pH ...
*April 1, 2012 by Keith*

**Chemistry **

First, the question I'm given is: What is the pH of a 1.0 L solution containing 0.25M acetic acid and 0.75M sodium acetate ( Ka for acetic acid= 1.8x 10-5) So I took the -log(1.8x10-5)= 4.74+log(.75/.25)= 5.22 pH But then I'm asked if .050 mol NaOH is added to the above ...
*April 8, 2013 by Marcus *

**Chemistry**

The answeres to the previous post was not what I am looking for...so please try to help me..... How can I make various concentrations of CuSO4(this is a blue solution)? I know that to make 0.1M you would fill the copper solution up to 10mL in the graduated cylinder and then ...
*January 6, 2014 by Anonymous*

**CHEMISTRY**

The answeres to the previous post was not what I am looking for...so please try to help me..... How can I make various concentrations of CuSO4(this is a blue solution)? I know that to make 0.1M you would fill the copper solution up to 10mL in the graduated cylinder and then ...
*January 6, 2014 by Anonymous*

**Chemistry**

The answeres to the previous post was not what I am looking for...so please try to help me..... How can I make various concentrations of CuSO4(this is a blue solution)? I know that to make 0.1M you would fill the copper solution up to 10mL in the graduated cylinder and then ...
*January 6, 2014 by Anonymous*

**P.E/Health**

1. When consuming fats the healthiest choice is foods high in? A. saturated fats B. unsaturated fats * C. trans fat D. cholesterol 2. The body's main energy source should come from what essential nutrient? A. protein B. fat C. carbohydrate*** D. minerals 3. The essential ...
*November 22, 2015 by Cami*

**statistics/Help Please!!**

In a sample of seven cars, each car was tested for nitrogen-oxide emissions (in grams per mile) and the following results were obtained:0.18, 0.12, 0.05, 0.19, 0.18,0.13, 0.15. Assuming that this sample is representative of the cars in use, construct a 98% confidence interval ...
*March 4, 2015 by slomomo*

**Chemistry**

I was asked to consider the solubility for hydrated calcium sulfate in HCl. The principal acid my proffesor had posted for the solution was [ CaSO4(hyrdrated) + HCl <--> H30^+ + Ca^2+ + SO4^2- ]. I guess what I'm asking is what happened to the Cl^- and why isn't it ...
*June 17, 2007 by john peterson*

**Chemistry**

Silver chromate is sparingly soluble in aqueous solutions. The Ksp of Ag2CrO4 is 1.12× 10–12. What is the solubility (in mol/L) of silver chromate in 1.4 M potassium chromate aqueous solution? In 1.4 M silver nitrate aqueous solution? In pure water?
*November 12, 2013 by Katherine*