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April 20, 2014

Search: 250 ml

Number of results: 16,312

Chemistry
25 mL 0.1 M acetic acid is titrated with 0.1 M NaOH. Calculate the pH after the addition of 0.0 mL, 1.0 ml, 2.5 mL, 4.0 mL, 7.0 mL, 10.5 mL, 15.0 mL, 17.0 mL, 20.0 mL, 22.0 mL, 23.0 mL, 23.5 mL, 24.0 mL, 24.25 mL, 24.5 mL, 24.75 mL, 25.0 mL, 25.25 mL, 25.5 mL, 25.75 mL, 26.0 ...
Monday, April 22, 2013 at 4:34am by smartkid <33

algebra
I will assume an open box with no lid base --- x by x height --- y x^2 + 4xy = 250 y = (250-x^2)/(4x) V = x^2y = x^2(250-x^2)/(4x) = 250x/4 - x^3/4 dV/dx = 250/4 - (3/4)x^2 = 0 for a max V 250 = 3x^2 x^2 = 250/3 x = √250/√3 , y = (250-250/3)/(4√250/√3) ...
Saturday, October 15, 2011 at 11:58pm by Reiny

Foods
Put the margarine in a 250 ml container with 125 ml cold water. Liquid measures may need to be heated.
Wednesday, November 3, 2010 at 7:18pm by Ms. Sue

College Chem
How many mL of concentrated ammonia (14M) should be diluted to 250 mL to make a 0.75 M NH3 solution?
Friday, November 19, 2010 at 9:29am by Lisa

pharmacology
Use the given equation, but include the units: 50 ml * 100 mg ml-1 = 50 * 100 mg (after the ml cancelled out) = 5000 mg No. of 250mg tablets required = 5000 mg / 250 mg-tablet-1 = 5000 /250 tablets = 20 tablets
Tuesday, February 1, 2011 at 4:04pm by MathMate

chemistry
The density of liquid water is 0.997 g/mL at 25 degrees Celsius. a) Calculate the mass of 250.o mL (about a cupful) of water. b) How many moles of water are in 250.0 mL of water? Use the result from letter a. c) Calculate the volume that would be occupied by 2.000 mol of water...
Tuesday, November 15, 2011 at 1:36am by khloe

chem
Calculate the pH of the solution that results from mixing the following four aqueous solutions together: (1.) 100. mL of 0.300 M HI (2.) 200. mL of 0.250 M LiCl (3.) 300. mL of 0.200 M KOH and (4.) 150. mL of 0.150 M HBr a. ) 2.00 b. ) 3.99 c. ) 5.32 d. ) 11.88 e. ) 12.00
Saturday, March 7, 2009 at 11:34pm by Anonymous

Chemistry
How many mL of 18 M H2SO4 are required to react with 250 mL of 2.50 M Al(OH)3 if the products are aluminum sulfate and water? How do i solve this?
Friday, April 30, 2010 at 8:09am by Anna

Chemistry-urgent!
Wouldn't you think you could dilute the 5.0% by a factor of 2 (making 125 mL to 250 mL) and that would reduce the concn to 2.50%?
Tuesday, November 30, 2010 at 4:51pm by DrBob222

CHEMISTRY
The 0.00025 for the first one is correct math BUT I made a typo. Of course the 1 should have been a 9. For (9/10^6)=(x/250) x = 9*250/10^6 = 0.00225 I made another typo when I wrote 1,000,000 (million) instead of 1,000,000,000(billion). So (9g/10^9)=(x/250) x = 9*250/10^9 = 2....
Friday, February 12, 2010 at 8:53pm by DrBob222

Chemistry
Consider the titration of 50 mL of 0.250 M HCl with 0.1250 M NaOH. Calculate the pH of the resulting solution after the following volumes of Na OH have been added. a) 0.00 mL b) 50.00 mL c) 99.90 mL d) 100.00 mL e) 100.1 mL The question is, I get, for example, 0.9 pH for "a." ...
Saturday, April 27, 2013 at 3:02am by George

Chemistry Please help
A bottle of 12.0 M hydrochloric acid has only 35.7 mL left in it. What will the HCl concentration be if the solution is diluted to 250.0 mL?
Sunday, September 29, 2013 at 6:17pm by Alexandra

Chem
500.0 Ml of 0.160 M NaOH is added to 565 ml of 0.250 M weak acid. Ka=2.46x10^-5. What is the pH of the resulting buffer
Monday, March 10, 2014 at 6:44pm by Joe

Analytical Chemistry
25.0 mL of a 0.1067 M Solution of nickel (II) sulfate is diluted to 250 mL with water. 10 mL of this solution is taken and diluted to 1.0 L. Calculate the concentration of [Ni2+] in the final solution in ppm.
Tuesday, February 11, 2014 at 2:53pm by Anonymous

Chemisty
25.0 mL of 0.250 M MgCl is transferred to a 300.0 mL volumetric flask and diluted to the mark with deionized water. What is the concentration of the dilute solution?
Tuesday, April 10, 2012 at 6:36pm by Wyatt

Pharmacy Math
The problem asks for mL of the concentrated acid; you calculated grams. N acid = 1.18 x 1000 x 0.375 x (1/36.46) = about 12.14 N Then 12.14 x ?mL = 250 x 0.1 Solve for ?mL. I obtained 2.06 mL which corresponds to 2.06*1.18 = 2.43 g.
Sunday, July 29, 2012 at 8:41pm by DrBob222

Heat Production (Animal Phy)
Assume that an animal consumes 200 ml of O2 in the course of metabolizing 250 mg of food. Determine the probable kind of food the animal has metabolized. How much heat has been produced? I determined the food type by dividing 200 by 250 to get 0.8 ml O2/mg, which is close to ...
Thursday, January 19, 2012 at 11:03am by CM

math
A. V = pi*r^2 * h = 250 in^3 h =250 / pi*r^2 = 250 / 28.3 = 8.84 In. B. V = (4/3)pi*r^3 = 250 In^3 r^3 = 250 / (4/3)pi = 250 / 4.19 = 59.7 r = 3.91 In. C. V = (1/3)pi*r^2*h = 250 In^3 Solve for h.
Wednesday, May 16, 2012 at 4:49pm by Henry

Chemistry
1 gallon toluene = about 3,785 mL density = about 0.867 g/mL mass toluene = 3785 mL x 0.867 g/mL = 3282 grams. C7H8 + 9O2 ==> 7CO2 + 4H2O moles toluene = grams/molar mass = 3282/92 = about 36 moles. From the equation above, 1 mole C7H8 will produce 7 moles CO2; therefore, ...
Sunday, October 3, 2010 at 1:42pm by Dan

chemistry
describe how you would prepare 500 mL 0.250 M ethylene glycol (MW=62.07) from concentrated 31% (w/w) solution that has a density of 1.0350 g/mL
Tuesday, January 29, 2013 at 5:56am by jessica

chemistry
describe how you would prepare 500 mL 0.250 M ethylene glycol (MW=62.07) from concentrated 31% (w/w) solution that has a density of 1.0350 g/mL
Tuesday, January 29, 2013 at 7:13am by jessica

chem biochem bio
You have the following stock solutions and solid chemicals in your lab: 1.5M NaCL 0.2M Tris buffer, pH 8.0 10 mg/ml Bovine serum albumin (BSA) MgCl2 (solid, anhydrous) MW = 95.211 g/mole (95% pure) How would you make 250 ml of the following solution??? 0.2M NaCl 0.05M Tris, pH...
Sunday, March 10, 2013 at 5:45pm by mel

Chemistry
Hi,may I have your help? I have posted a titration question that I'm trying to solve. The correct answer to the problem is 0.128 M, however,I have arrived at the answer: 0.000128 M. Here's the question: If 38.30 mL of 0.250 M NaOH is used to titrate 25.0 mL of phosphoric acid,...
Friday, December 10, 2010 at 5:37pm by Cliff

Chemistry
I don't know how accurately you want this done but I would think a quarter normal solution would be 0.91/4 = 0.2275 in which case 4-fold dilution is needed. 2. I don't think it is needed. If we use M x mL = M x mL, then 0.91/100 x mL = 0.2275/100 x 1,000 mL = 0.2275*1000/0.91...
Tuesday, December 14, 2010 at 7:55pm by DrBob222

Chemistry
So you have 0.600 g in 250 mL. That is 0.600/100 = 0.006 moles CaCO3. (I estimated the molar mass CaCO3; you need to confirm and update it.) Molarity = moles/L = moles/0.250 L = ? How many moles do you have in the 250. How many moles in 1/10th that?
Monday, April 12, 2010 at 4:49pm by DrBob222

math
(0,250), (5,325). A. m = (325-250) / (5-0) = 75 / 5 = 15. (0,250, (x,y). m = (y-250) / (x-0) = 15/1 Cross multiply: (y-250) = 15(x-0). B. (y-250) = 15(10-0) y-250 = 150 Y = 150 + 250 = 400 Employees.
Thursday, July 5, 2012 at 10:07pm by Henry

Chemistry
I don't get it. What's to calculate? 10% phosphoric acid = 10g H3PO4 + 90 g H2O or 10g/100 g soln. You want about 250 grams of solution so 10g x (250/100) = 25 g H3PO4 This won't be exactly 250 mL; you could take that into account if you knew the density of the 10% solution.
Tuesday, January 29, 2013 at 1:45am by DrBob222

College Chemistry
Calculate the pH of a solution prepared by mixing 250.mL of 0.174 molal aqueous HF (density=1.10g/mL) with 38.7g of an aqueous solution that is 1.50% NaOH by mass (density= 1.02g/mL).
Wednesday, March 23, 2011 at 9:12pm by Anonymous

math
15 mg = X (ml) * 250 mg/10 ml Solve for X X = 15/25 = 0.6 ml
Sunday, March 2, 2008 at 11:10pm by drwls

chemistry
Sr(OH)2 ==> Sr^+2 + 2OH^- pH = 13.12 pH + pOH = pKw = 14 and pOH = 0.88; therefore, (OH^-) = 0.132 What is the concn of the OH- in the satd soln? It is 0.132. That 15 mL is diluted to 250; now the concn is 0.132 x 15/250 = 0.00792M. We take 15 mL of that and titrate it with...
Monday, April 11, 2011 at 5:04am by DrBob222

Math
m = 3a 3(m-250) = a+250 3(3a-250) = a+250 9a - 750 = a+250 8a = 1000 a = 125 so, m = 375 check: 3(375-250) = 125+250
Saturday, November 3, 2012 at 1:39am by Steve

Physiology
Suppose a salt and a glucose solution are separated by a membrane that is permeable to water but not to the solutes. The NaCl solution has a concentration of 1.95 g per 250 mL (molecular weight = 58.5). The glucose solution has a concentration of 9.0 g per 250 mL (molecular ...
Saturday, May 14, 2011 at 10:46pm by ivy

College Chemistry
How many grams of solute are needed to prepare each of the following solutions? A. 1.000 L of 0.180 M NaCl B. 250.0 mL of 0.150 M CuSO4 C. 500.00 mL of 0.355 M CH3OH
Sunday, October 2, 2011 at 6:39pm by Bekah

chemistry
It's 500 mM to start. You dilute it 12.5 to 25 which makes it now 250 mM or 0.250 moles/L. So how many moles are in 0.1 mL?
Thursday, December 8, 2011 at 5:38pm by DrBob222

Chemistry
I assume this is 25% w/v. 25% w/v citric acid means 25 g citric acid in 100 mL soln or 250 g citric acid in 1000 mL. Convert 250 g citric acid to moles (moles = grams/molar mass). 2. Write the equation. 3. Using the coefficients in the balanced eqaution, convert moles H^+ in ...
Friday, August 5, 2011 at 11:24am by DrBob222

chemistry
if I dilute 250 of mL of 2.4 M lithium hydroxide solution so that it's new volume is 750 mL, what is the concentration of the solution?
Thursday, February 20, 2014 at 6:06pm by Emma

chemistry
how many mL of watel should be added to yeild a soultion that has a concentration of .125 M when you start with a 250 mL soultion of 1 M AgNO3?
Wednesday, January 26, 2011 at 12:01pm by nancy

Chemistry
I corrected the first post for the Li2SO4 formula but you didn't catch it. Be sure you catch it this time around. I usually see solubility quoted in grams/100 g soln or grams/100 mL soln. Based on that, and with no density, I don't know how to proceed unless you can clear that...
Monday, November 21, 2011 at 1:14pm by DrBob222

chemistry
1. Pour 50 mL of saturated calcium hydroxide Ca(OH)2 solution into a 125 mL beaker. DO NOT shake up the stock bottle. It is saturated and solid will be on the bottom. 2. Fold a piece of filter paper into a cone and fit it into a funnel. Your instructor will demonstrate the ...
Saturday, May 29, 2010 at 9:41pm by Anonymous

Chemistry
I need to find out what the total acid concentration is in Kool-Aid. If 23.3 mL of 0.1043M NaOH neutralize a 60 mL solution of Kool-Aid (10 mL) and water (50 mL), what is the total concentration in a 10.00 mL aliquot of Kool-Aid? If you prepared a standard 250 mL serving by ...
Tuesday, February 15, 2011 at 2:49pm by Julie

CHEMISTRY
calculate the ph of resulting solution when 2.50 ml of the 2.60 M acetic acid is diluted to make a 250.0 ml solution
Sunday, February 13, 2011 at 10:14pm by TYLER CHIRECE

CHEMISTRY
calculate the ph of resulting solution when 2.50 ml of the 2.60 M acetic acid is diluted to make a 250.0 ml solution
Sunday, February 13, 2011 at 10:15pm by TYLER CHIRECE

Chemistry Lab
If 12.50 mL of 0.324 M HCl is diluted to 250.00 mL, what is the concentration of HCl in the final solution?
Tuesday, May 10, 2011 at 3:39pm by Thao

Chemistry
What is the concentration of the resulting solution when 250 mL of 0.1 M K3PO4 and 300 ml of 0.5 M K3PO4 are mixed?
Monday, June 10, 2013 at 11:12am by L

Chemistry
What is the molarity of a solution of Mg(OH)2 if the solution contains 1.35 g in exactly 100 mL of solution??? A 15.0 mL solution of H2SO3 is neutralized by 12.0 mL of a standradized 1.00M NaOH solution. What is the concentration of the H2SO3 solution?????? What volume of a 1....
Wednesday, December 12, 2012 at 12:24am by Tasha

5 g vial
A 5 g igal reguires addinng 8.6 ml diluent to get concentration of 250 mg/ml. The powder volume is __ ml a.9.3 b.10.6 c.11.4 d.12.8 Does the powder form a solution or a colloid? IT makes a big difference. In solutions, the sum of the powder volume and the solvent volume seldom...
Monday, March 5, 2007 at 10:35pm by KUZAVA

chemistry
What is the concentration of HCl in a 250.0 mL sample of hydrochloric acid if 15.5 mL of 0.0100 M NaOH is needed to react with all the HCl?
Tuesday, February 22, 2011 at 6:51pm by Maddy

Chemistry-102
what is the ph solution obtained by mixing 25.00 ml of 0.250 ml HCl and 25.00ml of 0.125M NaOH
Wednesday, March 23, 2011 at 10:58pm by Christian

chemistry
moles H2C2O4 = grams/molar mass moles x (10/100) = moles in 250 mL. M = moles/0.250 = ??
Friday, November 18, 2011 at 1:00pm by DrBob222

Math
V = constant * T 250 mL = constant * 300 K constant = 250 mL/300 K = .833... mL/K so V = .833 T
Saturday, January 24, 2009 at 6:13pm by Damon

Chem
For the first one, check your work. I think you have an error of about 1000 times. I think 500*0.200/0.150 = 667 mL. However, that is the volume you will have, not how much water must be added. Water that must be added is 667-500 = ?? For the second one, M*mL = M*mL. 125 mL * ...
Friday, May 1, 2009 at 12:20am by DrBob222

osu
a 50.0 ml sample of a 15% (m/v) solution of H2SO4 is added to water to give a final volume of 250.0 ml. What would the final concentration be?
Tuesday, November 23, 2010 at 12:26pm by Kat

chemistry
A gas occupies 560.0 mL at 285 K. To what temperature must the gas be lowered if it is to occupy 250.0 mL? Assume that the pressure remains constant.
Wednesday, July 3, 2013 at 1:27am by madison

Chemistry
.45M X 250 Ml/ 5.5M= 21 ML of 5.5M stock solution.
Sunday, September 26, 2010 at 8:54pm by chaze

Analytical Chemistry
What is the cell voltage when the following volumes of 0.680 M NaBr have been added? (b) 1.0 mL (c) 13.2 mL (d) 24.7 mL (e) 25.6 mL (f) 26.0 mL (g) 38.9 mL (h) 51.4 mL (i) 52.0 mL
Thursday, April 11, 2013 at 5:51am by Micki

Finance
If it's simple interest and the rate is 5% yearly, then -- 5,000 * 0.05 = 250 250 * 5 = 1,250 5,000 + 1,250 = 6,250 The answer would be different if you charged compound interest.
Wednesday, February 10, 2010 at 4:44pm by Ms. Sue

chemistry
an aqeous sollution of 6.3 g oxalic acid is made up to 250 mL. calculate the volume of 0.1 N sodium hydroxide needed to neutralise 10 mL of this sollution?
Sunday, September 8, 2013 at 5:13am by Anonymous

Chemistry
Calculate the concentration of potassium ions in grams per liter after mixing 100 ml of 0.250 M KCl and 200 ml of 0.100 M K2SO4
Monday, September 16, 2013 at 6:30am by Elaiza

Chemistry
Can someone please tell me if I am doing this problem correctly. Thank you! Given: 450 mL (0.450L); 0.250 M KNO Need: Mass of KNO Q) What mass of KNO3 (MW=101) is needed to prepare 450mL of 0.250 M KNO3 in water? A) 0.450 L Solution x 0.250 M KNO/1 L solution x 101g KNO/1 mol ...
Monday, April 1, 2013 at 5:16pm by Kishwa

chemistry
DrWLS worked this problem yesterday. 0.502 g x 0.682 = g ASA in tablet. g ASA in tablet/molar mass = mols ASA in tablet. mols ASA in tablet/0.250 L = xx molarity in the 250 mL flask. Dilution was 3:100; therefore, the new solution is xx M x 3/100 = yy M in the 100 mL flask. ...
Monday, January 28, 2008 at 4:37am by DrBob222

Chemistry
A student was given 100mL of HCL solution in a 250mL beaker and told that the HCL was 0.11M. The student was also given phenolphthalein indicator and 250 ML of 0.1234 M NaOH. The student first filled a buret with NaOH solution. The student then placed an appropriate volume of ...
Thursday, November 21, 2013 at 4:28am by Lenny

Chemistry
Given: Mg + 2HCl --> H2 + MgCl2 0.250 g of magnesium reacts with 10.00 mL of 1.5 M HCl. What volume (in mL) of H2 gas is produced?
Wednesday, March 11, 2009 at 8:17pm by Jake

school
What is the pH of 0.1 M formic acid solution? Ka=1.7e10-4? What is the pH value of buffer prepared by adding 60 ml of 0.1 M CH3COOH to 40 ml of a solution of 0.1 M CH3COONa? What is the pH value of an acetate buffer (pK=4.76) prepared by adding 20 ml of 1 M HCl to 100 ml of a...
Sunday, December 11, 2011 at 7:58am by alshammari

Science/Chem
1. You dissolve 157.1 g of ammonium nitrate in a 250 mL volumetric flask and add water to the mark (call this solution A). You take 30 mL of solution A and place it in a 100 mL volumetric flask and add water to the mark (this is solution B). Next you take 50 mL of solution B ...
Sunday, September 28, 2008 at 4:40pm by Kelsey

science/chem
You dissolve 157.1 g of ammonium nitrate in a 250 mL volumetric flask and add water to the mark (call this solution A). You take 30 mL of solution A and place it in a 100 mL volumetric flask and add water to the mark (this is solution B). Next you take 50 mL of solution B and ...
Sunday, September 28, 2008 at 4:41pm by Kelsey

College Chem
How many liters of carbon dioxide at 20 oC and 750 torr are produced when one gallon of toluene is burned? C7H8 + 9O2 ==> 7CO2 + 4H2O 1 gallon toluene = about 3,785 mL density = about 0.867 g/mL mass toluene = 3785 mL x 0.867 g/mL = 3282 grams. moles toluene = grams/molar ...
Monday, October 4, 2010 at 12:39am by D

Chemistry
Determine the volume of 0.250 M KOH solution required to neutralize each of the following samples of sulfuric acid. The neutralization reaction is: H2SO4(aq) + 2KOH(aq) = K2SO49aq) + 2H2O(l) Find: 15 mL of 0.250 M H2SO4
Tuesday, November 30, 2010 at 7:31pm by Kelsey G

chemistry
350.ml of .25M KOH is reacted with 250.ml of .30M H3PO4. Determine which is the limiting reagent, the molarity of the salt formed, and the final molarity of the reactant that was in excess.
Monday, September 26, 2011 at 7:45pm by Ethan

Chemistry
Is that 50M NaCl or 0.50M NaCl? How many mols NaCl do you need? That is M x L = ? Then mols = g/molar mass and solve for grams NaCl. Weigh out that much NaCl and add to a 250 mL volumetric flask. How many mols acetic acid do you need? That is M x L = 0.1 x 0.250 = 0.025 You ...
Sunday, April 22, 2012 at 1:55pm by DrBob222

Chemistry
Is that 50M NaCl or 0.50M NaCl? How many mols NaCl do you need? That is M x L = ? Then mols = g/molar mass and solve for grams NaCl. Weigh out that much NaCl and add to a 250 mL volumetric flask. How many mols acetic acid do you need? That is M x L = 0.1 x 0.250 = 0.025 You ...
Sunday, April 22, 2012 at 1:55pm by DrBob222

math
ab=250 a=250/b but (a+b)/2=17.5 a+b=34 250/b + b=34 250+b^2=34b b^2-34b+250=0 now use the quadratic formula to find b.
Wednesday, December 15, 2010 at 9:16pm by bobpursley

physics
period = T = 1/f = 1/250 wavelength = L = speed*time = 30/250 sin 2pi(t/T-x/L) x/L = .10 (250/30) phase = 2 pi (.1*250/30) half a wavelength between nodes = 15/250
Friday, March 26, 2010 at 5:21pm by Damon

Chemistry(reposts #1)
A solution is prepared by dissolving 5.00 g of stannic nitrate in enough water to make 250.0 mL of stock solution. A 15.0 mL aliquot (portion) of this stock solution is then removed and added to 75.0 mL of water. Calculate the concentrations of all ions in the final solution.
Friday, October 25, 2013 at 8:18pm by Anonymous

chemistry
You started correctly. I don't know where you went wrong. mols acetic acid initially = 0.1 x 0.2 = 0.02. mols KOH at 250 = 0.250 x 0.1 - 0.025 So all of the acetic acid is used; an excess of 0.005 mols KOH remains. The volume (which probably is what you failed to take into ...
Thursday, July 23, 2009 at 11:12pm by DrBob222

Chemistry
in this experiment you are you will begin by preparing a dilute soultion of sodium hydroxide by taking 50 ml of 3 M NaOh stock solution and diluting it with 250 ml of water. i found that and the answer was .5 but how do i do this b. calculate the number of moles and grams of ...
Tuesday, February 23, 2010 at 9:48pm by Chris

Chemistry
I must admit this is a new one on me; however, I assume we have HClO at the equivalence point. moles NaClO = 1.86/about 74 = about 0.025 moles HClO = 0.025 at equivalence point. How much 1M HCl is required to titrate the sample? That will be M = mmols/mL or mL = mmols/M = 25 ...
Monday, February 13, 2012 at 2:50am by DrBob222

Chemistry
Bob, could you verify this answer for me too please? Thanks P1 = 1.08 atm V1 = 250 mL T1 = 297 K T2 = 310.2 K P2 = 2.25 atm Would V2 = 125.3 mL?
Sunday, March 31, 2013 at 7:01pm by Shadow

chemistry
68.2% of .502 g is 0.3424 g of ASA (acetylsalicylic acid). Divide that by 180.16 g/mole to get the number of moles of ASA. You end up with that many moles of ASA in the 250 ml flask. 3/250 of that number of moles of ASA ends up in the 100 ml flask, where it remains as the ...
Sunday, January 27, 2008 at 4:16am by drwls

chemistry
Remember M = moles/L (or mmoles/mL). So we start with how much Cl^-? That is 350 mL x 0.250M = 87.5 mmoles Cl^-. Let y = mL of the MgCl2 to be added. We have y mL of 0.500 M (in chloride) from MgCl2 to add to it. The total volume will be y mL + 350 mL. Now set that up as ...
Tuesday, August 30, 2011 at 8:03pm by DrBob222

chemistry
What is the molarity of a solution prepared by dissolving 4.92 g of calcium nitrate in 250 mL of water? 4.92 x 164 = 806.88 806.88 x 250 =201720 is this the answer???
Sunday, March 25, 2012 at 6:06pm by Ambra

Describe how you would make 250 mL of 0.500 M HCI
Describe how you would make 250 mL of 0.500 M HCI from 12.1 M HCI. Show calculations.
Monday, April 4, 2011 at 10:20pm by Anonymous

chemistry
You want to make an acetic acid/acetate buffer, pH 3.8, with a volume of 250 mL, and a final concentration of ([AcOH] + [AcO-]) = 0.1 M. You may only use acetic acid and sodium acetate (no strong acid or base). How many mL of glacial acetic acid would be needed (d = 1.05 g/mL)?
Saturday, March 7, 2009 at 11:44pm by Anonymous

Math
180 ml of a mixture of water and alcohol with 90% alcohol concentration is mixed with 70 ml of pure water. what is the alcohol concentration of the new mixture? Do the following: 1) Find out how many ml of alcohol was in the first mixture. (What is 90% of 180?) 2) Take that ...
Saturday, April 21, 2007 at 4:52pm by julia

Chemistry
Find the pH and volume (mL) of 0.447 M HNO3 needed to reach the equivalence point(s) in titrations of each of the following. (a) 2.65 L of 0.0950 M pyridine (C5H5N) pH volume Answer = 563 mL (b) 0.188 L of 0.250 M NH3 pH volume Answer = 105 mL I can't figure out the pHs for ...
Thursday, March 7, 2013 at 9:53pm by Franklin

chemistry
The vapor pressure of water at 25.0 C is 23.8 mm Hg. If 250. mL of water is placed in a chamber with a volume of 1.00 cubic meters, how many mL of water will evaporate
Tuesday, September 6, 2011 at 12:06pm by mike

CHEM
250 mL x 0.250M = 62.5 millimols HAc 250 mL x 0.250M = 62.5 mmols NaAc. add 5 mmols HAc add 5 mmols NaOH ............Ac^- + H^+ ==> HAc initial.....62.5..........62.5 add................5........... change......-5....-5......+5 equil.....57.5.....0......67.5 Substitute into...
Wednesday, March 28, 2012 at 2:54am by DrBob222

Science : Chemistry
I don't know all of the details of the procedure you use but here are the steps you need. Cl2 + 2I^- ==> I2 + 2Cl^- So 500 mL sample x 250 mg/L means you have 250 mg/L x 0.500 L = 125 mg Cl2 present. How many moles is that? 0.125g/molar mass Cl2 = about 0.002. Adjust for ...
Saturday, December 10, 2011 at 4:10pm by DrBob222

CHEMISTRY
9 ppb is so small that you may consider the mass of it negligible; therefore, the volume of water = mass of the water sinc the density is 1.00. 1 ppb = 1 gram/1,000,000 mL. I would use ratio and proportion to solve. (1/1,000,000 mL)= (x g/250 mL)
Friday, February 12, 2010 at 8:53pm by DrBob222

Differential Calculus
The units of measurements have not been supplied, so they will not be used. On the other hand, a 'common sense' check will not be possible without the units. f(t) = 250t - 25t² 1. maximum height occurs when f'(t) = 0 f'(t) = 250 - 25*2t = 250 - 50t = 0 t= 250/50 = 5 f(5...
Monday, August 10, 2009 at 3:47pm by MathMate

math
if you had 250 in your account, then deposited x dollars in the account, How do you write a expression that shows the new balance? a) 250-x, b) 250x c) x+250 d) 250/x
Monday, May 27, 2013 at 3:27pm by skylark777

Calc
Did you want that tangent to be horizontal ? if so, then dy/dx = 1 - x/250 to be horizontal tangent, dy/dx = 0 x/250 = 1 x = 250 then y = 250 - (250^2)/500 = 125 Q is (250,125) b) Did you mean" write" an equation for line L ? Until you clarify your question, I will stop here.
Sunday, January 27, 2013 at 9:40am by Reiny

Biochemistry
You perform gel filtration and measure an elution volume of 25 ml. When you calibrated the same gel filtration column, the elution volumes of proteins of known molecular weights were as follows: 400,000 Da, 10 ml; 250,000 Da, 20 ml; 150, 000 Da, 30 ml; 100,000 Da, 40 ml. Plot ...
Tuesday, September 11, 2007 at 12:10am by MIchelle

Chemistry
We have (0.205/82) = 0.0025 mols H2A. For Ca(OH)2 ==> Ca^2+ + 2OH^- .....solid.......x.......2x Ksp = 1.36E-6 = 4x^3 and x == [Ca(OH)2] = 0.00688 mols/L = M Ca(OH)2 + H2A ==> CaA + 2H2O Since this is a 1:1 ratio, it will take 0.0025 mol Ca(OH)2 to neutralize the acid. M...
Monday, February 25, 2013 at 6:27pm by DrBob222

chemistry
In a reaction involving the iodination of acetone, the following volumes were used to make up the reaction mixture: 10 mL 4.0 M acetone + 10mL 1.0 M HCL + 10 mL 0.0050 M I2 + 20 mL H2O A student found that it took 250 seconds for the color of the I2 to disappear. What was the ...
Monday, July 26, 2010 at 7:15pm by Paul

chemistry
If 10.0 mL of 0.250 mol/L NaOH(aq) is added to 30.0 mL of 0.17 mol/L HOCN(aq), what is the pH of the resulting solution?
Saturday, April 5, 2008 at 9:41pm by Tim's Titration Lab

chemistry
What kind of percent? Is this w/v, w/w, of just what. I will assume it is 5% w/v which means 5 g NaNO3/100 mL soln; therefore, for 250 mL (2.5 x 100) you will need 2.5 x 5 or 12.5 g NaNO3.
Saturday, August 7, 2010 at 2:41pm by DrBob222

chemisttry
how many ml of a 1 M NaOH solution do you need to add to a 250 ml flask and bring it to volume with deionized water to make a 0.12 M NaOH solution
Monday, April 23, 2012 at 8:35pm by william

Chemistry105
What is the molarity of a solution made by diluting exactely 10.00 mL of a 0.1235 M solution of KNO3 to exactely 250 mL in a graduated flask?
Sunday, November 25, 2012 at 2:22am by Mira

chemistry
It requires 23.2 mL of 0.250 M KOH to titrate 49.0 mL of an HCl solution of unknown concentration. Calculate the initial HCl concentration.
Tuesday, March 18, 2014 at 10:39pm by amber

analytical chemistry
a 0.120 ml portion of a 50.0% (w/w) KOH solution having a density of 1.50*10^3 g/l is diluted to 250 ml. What is the pH of the resulting solution?
Saturday, March 30, 2013 at 10:50pm by lolo

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