Friday
April 18, 2014

Search: Calculate the solubility (in grams per 100 mL of solution) of magnesium hydroxide in a solution buffered at pH = 12.

Number of results: 93,150

physics
F = 100 cos 30 = 86.6 N = 100 (sqrt 3)/2 a = F/m = 86.6/40 = 2.17 m/s^2 =(100/80)sqrt 3 = (5/4) sqrt 3 m/s^2 so five square roots of three all over four meters per second squared
Wednesday, February 5, 2014 at 5:25pm by Damon

Chemistry AP-Density
The level of water in a graduated cylinder is at the 100 mL mark. When a platinum crucible floats on the surface of the water, the level reads 157.9 mL. When the crucible is totally immersed in the same cylinder, the level reads 102.70 mL. What is the density of platinum? The ...
Thursday, August 26, 2010 at 6:09am by Victoria

chemistry
to find the mass percentage of one component, you divide the its mass to the total mass * 100 for example, if you have initially 20 grams of Na and 30 grams of Fe, total mass = 20 + 30 = 50 if we want to find mass percentage of Na: (20/50) * 100 = 40% for mass percent of Fe: (...
Wednesday, March 23, 2011 at 8:50pm by Jai

Science
A solution is prepared by dissolving 38 g of H2S04 in 220 g water. If the density of the solution is 1.96 g/ml, find its: molality molarity mole fraction of the components of the solution normality This assignment is needed tomorrow. I really don't know the answer. I tried ...
Sunday, January 26, 2014 at 8:17am by Drenju

chemistry
The relative sweetness of sucralose is 60000. The relative sweetness of sugar is 100. How many grams of sucralose would you need for a solution that has the same sweetness as one made with 2.00g of sugar?
Monday, April 30, 2012 at 5:34pm by msladycap

A.P. CHEMISTRY
How many grams of methanol are needed to raise the boiling point of 250 mL of water by 2.7C. The boiling point elevation constant for water = 0.512 C/m. Assume water to have a density of 1g/mL)
Thursday, March 4, 2010 at 6:29pm by mary

chemistry
The solubility in methanol at 25 C and at 0C may be close to the same value. I would try a new solvent OR use a different temperature range. Methanol is a polar solvent; a non-polar one might be better. One of the main things in recrystallization is to find a solvent where the...
Monday, February 11, 2013 at 8:19pm by DrBob222

chemistry
Calculate the mass percent concentration of a solution made by dissolving 5.00g of NaCl in 25.0g of water? I got 5.00g/25.0g=0.2 x 100= 20% Is this right?????
Monday, November 21, 2011 at 4:42pm by Sarah

Chemistry
The compound A1B2 (molar mass = 132) has a solubility of 13 g/L. Calculate the Ksp for this compound. I'm stuck on this question, please help?
Sunday, April 3, 2011 at 10:37pm by Adrianna

chemistry
do not understand this problem The Ksp of CaSO4 is 4.93 105. Calculate the solubility (in g/L) of CaSO4(s) in 0.500 M Na2SO4(aq) at 25 C.
Friday, February 15, 2013 at 7:23pm by Mohsain

Chemistry
The Ksp of magnesium hydroxide, Mg(OH)2, is 5.61 10^-12. Calculate the molar solubility of this compound. Is the answer 1.1*10^-4 M?
Saturday, March 16, 2013 at 4:46pm by Anon

chemistry
millimoles HNO3 = mL x M = 50.00 x 0.3M = 15 millimoles. mmoles KOH = mL x 0.6M = mL = 0, 0mmoles KOH mL = 15.5, 9.3 mmoles mL = 25.0, 15 mmoles mL = 40.0, 24 mmoles I'll do the 15.5 or 9.3 mmoles KOH added. ..........HNO3 + KOH ==> KNO3 + H2O initial...15......0........0...
Friday, December 2, 2011 at 6:50pm by DrBob222

chemistry
Calculate the theoretical yield (g) of precipitate formed when 10.0 mL of 0.50 M magnesium nitrate is added to 5.0 mL of 0.50 M potassium phosphate? [You must first write the balanced chemical equation.] Which reactant is present in excess?
Tuesday, February 26, 2013 at 7:04pm by Joe

Chemistry College Level
Ok, so here's my question: If exactly 14.563 grams of KMnO4 were dissolved to yield 750 mL of solution waht would be the normality of the KMnO4? From a previous question (that this question says to refer to) we have: MnO4- +8H+ +5e --> Mn2+ +4H2O I'm not exactly sure what ...
Sunday, April 17, 2011 at 4:52pm by Tichele

Chemistry
Question: A 0.400 g sample of propionic acid was dissolved in water to give 50.00 mL of solution. This solution was titrated with 0.150 M NaOH. what was the pH of the solution when the equivalence point was reached? I'm not really sure how i would go about setting this up. ...
Wednesday, April 15, 2009 at 10:07pm by Eliz

Chemistry
Silver chromate is sparingly soluble in aqueous solutions. The Ksp of Ag2CrO4 is 1.12 1012. 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?
Tuesday, November 12, 2013 at 4:11pm by Katherine

Chemistry
can't convert ml to grams
Sunday, October 3, 2010 at 1:42pm by Dan

chemistry
a solution of sulphuric acid is titrated (allquot 20.0ml) with a solution of sodium hydroxide (0.1234M) 26.73ml of the base being required to the end point with phenolphthalein. calculate the molarity of the sulphuric acid solution
Saturday, November 19, 2011 at 9:01pm by payton

chemistry
the chlorine in a 0.12g sample of 95% pure magnesium chloride is to be precipitated as silver chloride, calculate the volume of 0.100m of silver nitrate solution required to precipitate the chloride and give a 100% excess.
Thursday, July 7, 2011 at 8:29pm by julius

Chemistry
explain how you would make the following solution. You should tell how many grams of the substance you need to make the solution, not how many moles. 2L of 6M HCl
Wednesday, May 5, 2010 at 5:45pm by Jenifer

chemistry
explain how you would make the following solution. You should tell how many grams of the substance you need to make the solution, not how many moles. 2L of 6M HCl
Wednesday, May 5, 2010 at 7:28pm by Jenny

Chemistry
A solution contains 0.55 g of dissolved Sn 4+ ions. How many grams of Na2CO3 must be added to the solution to completely precipitate all of the dissolved Sn4+?
Monday, April 23, 2012 at 9:31pm by Anna

Chemistry
I cannot figure out the equation and answer to the following. Can someone help please. A 25.0 mL solution of HCl has been spilled. It took 21.8 mL of saturated 2.5 M NaOH to neutralise the acid. What was the molar concentration of the acid?
Wednesday, August 28, 2013 at 7:41pm by Campbell

Chemistry
What will the graph look like when the relationship of the number of grams of solute that a soluution is 50grams of H2O at varying temp, if the solubility begins at a small quantity and increases in direct proportion the increase in temp? Thank you!
Wednesday, June 3, 2009 at 8:29pm by Anonymous

Chemistry
Amino acid solution was made by taking 3.58 g of the dry amino acid and making it up to 1.00L in water. A 25.0 mL sample was taken and titrated with NaOH of concentration of 0.0493M, with the first equivalence point at 18.15 mL and the second equivalence point at 32.05 mL. ...
Sunday, May 20, 2012 at 4:06pm by k

chemistry
Question -1 Percent by mass of the solution= mass of NaCl/total mass= 25g of NaCl/25 g of NaCl +100g of H2O Question-2 Density =mass/volume, solve for volume Solve for moles moles of NaCl=25g of NaCl/58.44 g of NaCl/mol Solve for Volume mass/density=volume=125g of total ...
Tuesday, January 29, 2013 at 6:03pm by Devron

chemistry
the level of water in a graduated cylinder is 52.7 ml. After a solid object weighing 100 g is added, the level is 87.4 ml. What is the density of this object?
Sunday, October 14, 2012 at 10:14pm by mark

Chemistry
If say 70 mL of water is heated vs 100 mL of water, would the temperature be different or does the amount of the substance not make a difference on the temperature Thanks!
Thursday, February 27, 2014 at 8:59pm by Laura

chemistry - DrBob222
For this question can u please explain steps 3 and 4 4.0 g of ferrous ammonium sulphate, FeS04(NH4)2 SO4 6H20, is used. The oxalate is in excess, calculate the theoretical yield of the iron complex. Can someone please show me how to calculate a question like this please? Thank...
Monday, November 15, 2010 at 1:51am by eddy

chemistry/ quantitative analysis
Look up the Ksp for CaSO4, set up an ICE chart, and solve for solubility (in moles/L) of CaSO4, then convert to grams and multiply by 6.
Sunday, May 22, 2011 at 9:52pm by DrBob222

chemistry
A 10.0-mL sample of vinegar, which is an aqueous solution of acetic acid, CH3COOH, requires 16.5 XML of a 0.500M NaOH solution to reach the endpoint in a titration (where the moles of acid are equal to the moles of base). What is the molarity of the acetic acid solution
Wednesday, May 4, 2011 at 9:14am by Zarion Gibbs

chemistry
What Dr. Bob222 did was give you the setups to calculate the molarity. Transmittance is related to absorbance, so you have to calculate the absorbance of the blank and subtract it from your sample to to acquire the correct absorbance value for your sample. A unknown- A blank= ...
Sunday, July 28, 2013 at 7:33pm by Devron

chemistry
a volatile liquid was allowed to evaporate in a 43.298g flask that has a total volume of 252 mL.,the temperature of the water bath was 100 celcius at the atmospheric pressure of 776 torr.the mass of the flask and condensed vapor was 44.173g.calculate the molar mass of the liquid.
Wednesday, June 23, 2010 at 2:48pm by Ana

chemistry
A volatile liquid was allowed to evaporate in a 43.298g flask that has a total volume of 253 mL. The temp of the water bath wad 100 C at the atmospheric pressure of 776 torr. The mass of the flask and condensed vaporous was 44.173g. Calculate the molar mass of the liquid
Tuesday, April 10, 2012 at 12:26am by tiffany

Chemistry
Suppose that 30.0 mL of 0.20 M C6H5COOH(aq) is titrated with 0.30 M KOH(aq). Refer to table 1 and table 2. (a) What is the initial pH of the 0.20 M C6H5COOH(aq)? Using ICE i found to be 2.46 The rest I do not know how to set up or solve... (b) What is the pH after the addition...
Friday, March 12, 2010 at 3:58pm by Val

CHemistry Dr. Bob please?
per mol is understood. So calculate delta H in kJ/mol and just omit the per part.
Tuesday, November 11, 2008 at 5:16pm by DrBob222

chem
delta T = Kf*molality Plug in 5.00 C for delta T, 1.86 for Kf and calculate molality. Then molality x kg solvent x molar mass = grams. You know molality, kg solvent, and molar mass. Calculate grams. Post your work if you get stuck.
Tuesday, February 5, 2008 at 9:46pm by drbob222

Chemistry
Suppose that 50.0 mL of 0.25 M CH3NH2(aq) is titrated with 0.35 M HCl(aq). (a) What is the initial pH of the 0.25 M CH3NH2(aq)? (b) What is the pH after the addition of 15.0 mL of 0.35 M HCl(aq)? (c) What volume of 0.35 M HCl(aq) is required to reach halfway to the ...
Wednesday, November 3, 2010 at 5:00pm by Dana

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

college chemistry
10.0 mL of 0.15M of sulfuric acid is titrated with 0.05M of sodium hydroxide. how many mL of sodium hydroxide solution are required to reach the equivalence point?
Wednesday, November 17, 2010 at 12:52am by tim

college chemistry
10.0 mL of 0.15M of sulfuric acid is titrated with 0.05M of sodium hydroxide. how many mL of sodium hydroxide solution are required to reach the equivalence point?
Wednesday, November 17, 2010 at 8:12am by tim

chem
(a) What is the pH of 50 mL of a 0.2M glycolic acid aqueous solution after adding 5 mL of 0.25 M KOH? The pKa of glycolic acis is 3.83 at 25 ∘C.
Friday, January 11, 2013 at 11:18am by larry

science
What is the pH of 50 mL of a 0.2M glycolic acid aqueous solution after adding 5 mL of 0.25 M KOH? The pKa of glycolic acis is 3.83 at 25 .
Saturday, January 12, 2013 at 2:42am by harry

Chemistry
At the equivalence point in a titration you know the volume (x mL) of a standard solution of acid (2.5 M) that has been added to a known volume base (y mL). show how you can determine the concentration of the base.? Explain
Friday, March 15, 2013 at 2:09am by Juan

chem
1. 50.00 mL of an unknown monoprotic acid is titrated with 0.132 NaOH. It takes 25.25 mL of base to reach the equivalence point. Calculate the concentration of the acid.
Sunday, July 25, 2010 at 10:53am by Anonymous

chemistry
50.00 mL of 1.0 M HCl and 50.00 mL of 1.0 M NaOH are mixed. The temperature is observed to increase by 10.0 degrees C. How much energy (in J) was absorbed by the calorimeter? Assume a density of the reaction mixture of 1 g/mL. Specific heat of the solution is 5.00 J/g/degree C...
Thursday, May 27, 2010 at 8:44pm by hongkong

Chemistry...Help!!
Molar mass of CuCl2 is 134.5 g mol^-1 so solution needs to contain 4.53 g / 134.5 g mol^-1 =0.03368 mole concentration is 0.049 L/0.03368 mole =1.455 molar thus we need to dilute the 8.20 M solution by a factor 8.20 M/1.455 M= 5.636 so the new total volume is 131 ml x 5.636 =...
Tuesday, December 7, 2010 at 11:12pm by Dr Russ

Chemistry/lab math
The equation is delta A/minute and since your measurement is for 5 min I think you divide by 5 to get per min. As for the 3.2 = Vt, I don't think that is right. The problems states "3 mL reaction mixture" which means the total volume is 3 mL and not 3.2.
Tuesday, August 20, 2013 at 10:06pm by DrBob222

chemistry
I'm not sure what you mean by a dry solution. Certainly there are many but I don't think any of them apply here. Do you mean 135 mL of 0.120 M NaNO3 in a solvent. Do you want 1 L of solution. You want how many mols? That's M x L = ? = 0.135 x 0.120 = ? Then mol/L = ?mols/L ...
Saturday, February 8, 2014 at 11:52am by DrBob222

chemistry
I have no idea how to begin solving these problems... Calculate the normality of a 1.0 molal solution of each of the following acids: a. HCl b. H2SO4 c. H3PO4 Calculate the molality of a 1.0 normal solution of each of the following acids: a. HCl b. H2SO4 c. H3PO4
Thursday, February 7, 2013 at 10:54pm by Danny

Chemistry
A: A student must make a five-fold dilution of a 2.15 M HCl solution. If the student wishes to make 75.0 mL of the diluted solution, what volume of the 2.15 M solution will he need to dilute? B: What is the concentration of the diluted substance?
Monday, March 21, 2011 at 2:16pm by Anonymous

chemistry
Suppose that 50mL of a solution of sulfuric acid of unknown concentration was titrated with a 0.100M solution of sodium hydroxide. If it took 45.5 mL of titrant to reach the equivalence point, what was the concentration of the unknown solution of sulfuric acid???
Sunday, July 7, 2013 at 5:21pm by Coach

college gen chem
A quantity of 16.13 mL of a KOH solution is needed to neutralize 0.4883 g of KHP. What is the concentration (in molarity) of the KOH solution?
Monday, March 2, 2009 at 4:19pm by han

Chem
A household bleach solution contains 5.25% (by mass) NaClO. How many moles of NaClO are needed to make 1000L of the solution? (density = 1.07g/mL)
Friday, March 26, 2010 at 4:48pm by Staci

math
Solve the problem. If the answer is an amount of money, round to the nearest dollar. A chemical solution contains 3% salt. How much salt is in 4.5 ml of solution?
Tuesday, August 17, 2010 at 9:17pm by Sarah

Chem 2068 lab
Once I have the molarity for KHP which is 0.0027 M, and i add 14.48 mL of NaOH to the solution, what is the concentration of NaOH in the solution.
Monday, October 18, 2010 at 9:12pm by Car

Chemistry
A 327- ML sample of unknown HCI solution reacts completely with Na2CO3 to form 20.1 g CO2 What was the concentration of the HCI solution?
Tuesday, November 30, 2010 at 3:16pm by Cathy Miller

Chemistry
An aqueous solution of H2SO4 is 60.0 % H2SO4 by mass. The density of the solution is 0.968 g/mL . I need to find the Molality, mole fraction, and Molarity.
Friday, December 3, 2010 at 11:35am by Sara

Chemistry
A stock solution is prepared by adding 20mL of 0.2M MgF2 to enough water to make 80mL. What is the F concentration of 20 mL of the stock solution?
Thursday, November 3, 2011 at 9:29pm by aDRIAN

chemistry
An HNO3 solution has a pH of 3.04. What volume of 0.015 M LiOH will be required to titrate 89.0 mL of the HNO3 solution to reach the equivalence point?
Thursday, January 5, 2012 at 8:11pm by Anonymous

chemistry
To what volume must 481 mL of 12 M Ca(OH)2 solution be diluted to make a 2 M Ca(OH)2 solution? a)1.352L b)2.886L c)2.10833L d)none of the above
Wednesday, April 4, 2012 at 10:16pm by Allison

MATH
A provider orders 90 ml of a 2.5% mannitol solution. How much of a 25% mannitol solution should be added to water to achieve the appropriate strength?
Friday, July 6, 2012 at 10:29am by Niricoel

chemistry
What volume of a concentrated hcl solution which is 36% by mass and has a density of 1.179 g/ml to make 4.85L of an hcl solution with ph of 1.9? Who helps me to solve it for me.
Saturday, August 4, 2012 at 10:31pm by Fai

chemistry
20mL ethanol(density=o.789g/mol) is dissolved in sufficient water to produce a 200mL solution. the density of the solution is 0.982g/mL. what is the molarity?
Monday, March 11, 2013 at 7:19am by mj

Chemistry
What volume of a 15.0% by mass NaOH solution, which has a density of 1.116 g/mL, should be used to make 4.40 L of an NaOH solution with a pH of 10.5?
Sunday, March 17, 2013 at 1:58pm by Emma

chemistry
a 35.0ml sample of 37 hcl solution has a density of 1.18g/ml. the sample is diluted to a volume of 0.125L. what is the molarity of the final solution ?
Sunday, May 5, 2013 at 10:46am by john

chemistry
a 35.0ml sample of 37% hcl solution has a density of 1.18g/ml. the sample is diluted to a volume of 0.125L. what is the molarity of the final solution ?
Sunday, May 5, 2013 at 11:54am by john

chemistry dilution
Typos Add 6.67 x 10^1 mL of solvent to 1mL of stock. Converting everything to ug/mL, 200/3 =6.67 x 10^1 mL 200ug/(6.67 x 10^1 mL +1 mL)= 2.96ug/mL
Wednesday, February 27, 2013 at 8:54pm by Devron

Mec 123
A flywheel rotating at 5.3 revolutions per second has an angular retardation of 4/5 radian per second per minute.calculate:(i)its angular velocity after 45 seconds(ii),the number of revolutions it makes in 1 minute, and in coming to rest.
Saturday, July 10, 2010 at 7:42am by dan

Chemistry
A solution is made by dissolving 10.20 grams of glucose (C6H12O6) in 355 grams of water. What is the freezing-point depression of the solvent if the freezing point constant is -1.86 C/m?
Friday, January 14, 2011 at 4:24pm by Maria

chem 103
Still stuck on this question. How many grams of Na3PO4 would you need to make 0.225L of 8.0M stock solution? 8.0 M of NaPo multiplied by .225L NaPO = 1.8 mols of Na3PO4. Then multiply the 1.8 mol times the mass of Na3PO4 which is 163.93 grams?, yes? This would make 295.07 ...
Sunday, July 14, 2013 at 1:35pm by Andrew

chemistry
You need to be aware of the definitions. I can get you started. For A, remember the definition of % by mass is (mass solute/mass soln)*100 = % w/w. Therefore, you have 10 g H2SO4/100 g solution. You want to know how many g H2SO4 are in 50 g of this solution. Of course that's ...
Sunday, April 7, 2013 at 10:58pm by DrBob222

Chemistry
The cloth shroud from around a mummy is found to have a carbon-14 activity of 8.1 disintegrations per minute per gram of carbon as compared with living organisms that undergo 15.2 disintegrations per minute per gram of carbon. From the half-life for carbon-14 decay, 5715 yr, ...
Sunday, May 1, 2011 at 1:50pm by Anonymous

Chemistry
What is the ( m/m) % concentration of a tin in a solution of 5.000 grams of tin dissolved in 95.000 grams of copper
Wednesday, December 4, 2013 at 11:51pm by Ruffles

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 ...
Wednesday, April 21, 2010 at 3:36am by anonymous

Chemistry II
If 36.0 mL of 7.0e-4 M HClO4 is added to 19.5 mL of 8.2e-4 M LiOH, what is the pH of the solution? Write the equation. Calculate mols HCLO4. Calculate mols LiOH. Determine how much of which reagent remains after the reaction. pH = -log(H^+) post your work if you get stuck. ...
Wednesday, April 25, 2007 at 7:59pm by Jayd

chemistry
Enter the formula and state of the major species that result when a few grams (about 0.01 mol) of each substance is added to 100 mL of water. When appropriate use water to form species such as the hydronium ion. Separate multiple species by commas. sulfur dioxide silver ...
Friday, June 4, 2010 at 6:09pm by Judy

calculus II
Calculate the limit of the series 100[1 + 2*(2/3) + 2*(2/3)^2 + 2*(2/3)^3+...] = 100 + 2[1 + 2/3 + (2/3)^2+ ...] Make use of the relation: 1 + x + x^2 + .. = 1/(1-x) (for x<1, which is the case here)
Sunday, July 12, 2009 at 11:36pm by drwls

Analytical chemistry
A water sample was analysed using a sodium selective electrode. The electrode response was 75.0 mV. A 10.00 mL aliquot of standard 0.50 mmol/L NaCl solution was added to 10.00 mL of water sample. The well-mixed solution gave a response of 98.0 mV. What is the concentration of ...
Monday, August 12, 2013 at 8:33am by RC

Chemistry
I wouldn't call AgCl a solid solution. It is a salt that is not soluble in water except to a very limited extent (The solubility product is Ksp = about 10^-10). Salts may be soluble or not depending upon the solubility rules and you seem to have those rules down rather well. ...
Monday, June 30, 2008 at 7:19pm by DrBob222

Chemistry
You need a solubility table or the identity of the solute and a solubility table for it.
Sunday, April 25, 2010 at 5:41am by DrBob222

Chemistry
URGENT!!!!! 4 questions total! 1. .0025 M tartric acid completely reacts with .0030 m of al bicarbonate if .913 l of co2 forms at 298 k with pressure of 1.4 ATM how much base used? 2. 3.1 x 10^23 molec of .0035 m hydriodic acid reacts with 25 g of magnesium bicarbonate how ...
Monday, May 21, 2012 at 3:12am by Danny

chemistry
At 20C, a solution contains 120 g of NaNO3 in 100 g of water. Is this solution saturated, unsaturated, or supersaturated?
Thursday, July 14, 2011 at 3:26am by rocky

Statistics
A telephone company's goal is to have no more than 4 monthly line failures on any 100 miles of line. The company currently experiences an average of 5 monthly line failures per 50 miles of line. Let x denote the number of monthly line failures per 100 miles of line. Assuming x...
Saturday, February 11, 2012 at 10:14pm by Krista

Chemistry
You want to make an ICE chart and use the Henderson-Hasselbalch equation. Let's simply our typing by calling CH3COOH just HAc and CH3COONa will be NaAc. mmoles HAc = 0.400 M x 100 mL = 40.0 mmoles Ac^- = 0.200M x 100 mL = 20.0 mmoles HCl added = 1.00 mL x 10.0 M = 10.0...
Sunday, June 26, 2011 at 11:34pm by DrBob222

Chemistry
A solution contains 0.0653g of compound in 8.31g of ethanol. The molarity of the solution is 0.0368m. Calculate the molecular weight of the compound For Further Reading Chemisty - drbob222, Thursday, February 7, 2008 at 9:40pm The molarity of the solution can't be 0.0368 m. It...
Saturday, February 9, 2008 at 6:27pm by Lauren

math
A tank contains 50 gallons of a solution composed of 90% water and 10% alcohol. A second solution containing 50% water and 50% alcohol is added to the tank at rate of 4 gallons per minute. As the second solution is being added, the tank is being drained at the rate of 5 ...
Friday, August 10, 2012 at 9:58pm by deel

Chemistry Math
First determine the molarity of the HCl from the standardization part of the problem (the second part of the problem) using 0.1876 g NaHCO3 and 37.86 mL HCl. NaHCO3 + HCl ==> NaCl + H2O + CO2 mols NaHCO3 = grams/molar mass mols HCl = mols NaHCO3 M HCl = mols HCl/L HCl. Then...
Sunday, November 18, 2012 at 1:18pm by DrBob222

chemistry
If you wanted to standardize an approximately 0.1 M solution of hydrochloric acid by titrating 10.00 mL (delivered from a pipet)with approximately 30mL of sodium hydroxide solution (delivered from a buret), what should be the approximate concentration of the sodium hydroxide ...
Thursday, April 22, 2010 at 11:26am by Peter

chemistry
How would you prepare a solution of about 8mg/100ml of ascorbic acid in water (25ml)? I'm not sure if they mean to use that ratio of ascorbic acid in water to make a 25 ml solution or if the wording means something else.
Saturday, February 22, 2014 at 4:23pm by solution chemistry

Chemistry
We have 250. ml of He at 2.56 atm and 25 degrees C. What is the final volume if we heat the sample to 150 degrees C while we compress the volume to 100. ml
Wednesday, October 27, 2010 at 12:54pm by Tara

Analytical Chemistry
Consider the titration of 100.0 mL 0.1 M KOH with 1.0 M HBr. Find the pH at the following volumes of acid (Va) added: Va= 0, 1, 10 and 10.1 mL.
Saturday, November 26, 2011 at 4:36pm by Remy

chemistry
Lactic acid, C3H6O3, is found in sour milk. A solution containing 1.00g NaC3H5O3 in 100.0mL of 0.0500M C3H6O3 has a pH= 4.11. Calculate the Ka of lactic acid
Thursday, April 14, 2011 at 8:11am by Lauren

Chemistry
delta T = Kb*m Calculate m m = moles/kg solvent. Calculate moles moles = grams/molar mass Calculate molar mass.
Tuesday, June 8, 2010 at 6:55pm by DrBob222

chemistry
Four solution are prepared and mixed together: Start with 100.0ml of 0.100M BaCl2. Add 50.0ml of 0.100M AgNO3. Add 50.0ml of 0.100M H2So4. Add 250.0ml of 0.100M NH4. Write an equation for any reaction that occurs after each step and calculate the concentration of Ba,CL,NO3,NH4...
Wednesday, May 2, 2012 at 6:56pm by Sean

college
This is a simple solubility product problem although the problem spends a lot of time talking about activity coefficients et al. Since the activity coefficient is 1, all the rest of the problem is meant to confuse. BTW, note the correct spelling of fluorite. CaF2 ==> Ca^+2...
Saturday, September 11, 2010 at 9:01pm by DrBob222

Calculus
A large tank is filled with 200 gallons of pure water. Brine containing 1 pound of salt per gallon is pumped into the tank at the rate of 5 gallon per minute. The well-mixed solution is pumped out at the same rate. (a) Find the number A(t) of pounds of salt in the tank at any ...
Monday, November 23, 2009 at 11:32pm by Thomas

pharma medicine
you are combining 50ml of a 20%sol,150ml of a 15% sol.,and 200ml of a 35% sol.what is the final % concentration of the mixed sol. how many total grams are is the final sol? Grams total= .2*50 + .15*.15 + 200*.35 This is making a big assumption: that the density of the ...
Saturday, December 2, 2006 at 1:34pm by rimple

Chemistry
Did I do this correctly or do I need to try again? What is the mass percent of a solution when 18.6 g of table salt is added to 81.4 g of water? Mass Percent = mass of solute(g)x100 mass of solution (g) = 18.6 g x100 18.6 g + 81.4g = 18.6 g x 100 100g = 0.186 x 100 = 18.6 The ...
Friday, February 8, 2008 at 1:48pm by Lori

Chemistry
2KMnO4(aq)+16HCl(aq)->2MnCl2(aq)+5Cl2(g)+8H2O(l)+2KCl(aq) A.)the volume of 0.414 M KMnO4 needed to produce 1.66 mol MnCl2 B.) the volume of 2.15 M HCl needed to produce 112 mL of 0.618 M KCl C.)the molarity (M) of the HCl solution when 26.42 mL react with 28.38 mL of 0.398 ...
Friday, December 10, 2010 at 1:40pm by Anonymous

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