Number of results: 37,189
chemistry
A sample of 6.65 grams of NaOH is dissolved into 621 mL of aqueous 0.250 M NaOH (as- sume no volume change). This solution is then poured into 2.16 gallons of water. (You may assume that the two volumes can be added.) What is the concentration of NaOH in the final solution? ...
Tuesday, December 18, 2012 at 7:53pm by lauren
please help analytical chemistry
What mass of BaSO4 is formed when 18.7 mL of 0.125 M Ba(NO3)2 solution is added to 16.2 mL of 0.152 M H2SO4 solution?
Monday, April 8, 2013 at 12:24pm by Anonymous
Chem 2
A solution is made by mixing 47.0 mL of ethanol, C2H6O, and 53.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C?
Saturday, July 14, 2012 at 5:43pm by Pagye
geometry
Since E and F are midpoints, EF ║ CB, and has length CB/2 = 1 CE = AC/2 = 3 Label angles CGB = a EBC = b FCB = c so, intriangle CGB, a+b+c = 180 degrees we want cos a = cos *180 - (b+c)) = -cos(b+c) = sinb sinc - cosb cosc Looking at the right triangles, EB = &#...
Saturday, March 2, 2013 at 2:02pm by Steve
science
How many ml of a 2% solution will 20 ml of a 10% solution make?
Tuesday, September 11, 2012 at 12:23pm by jenny
chemistry
Who knows? 30% in 200 mL solution means 60 g isopropyl alcohol with enough water added to make a total volume of 200 mL of solution. That will be 200-60 = 140 mL water IF (and ONLY IF) the volumes of isopropyl alcohol and water are additive. I expect they are not. For example...
Sunday, March 27, 2011 at 8:30pm by DrBob222
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 ...
Sunday, April 21, 2013 at 9:18pm by Emily
Math 101
Look at it as if you are given two ordered pairs (3,250) and (4,120) of the form (P,B) slope = (120-25)/(4-3) = -130/1 = -130 then just like in y = mx + b B = -130P + b sub in (4,120) 120 = -130(4) + b b = 640 B = -130P + 640 check: if P= 3 , B = -130(3) + 640 = 250 if P = 4...
Wednesday, October 19, 2011 at 10:39am by Reiny
chem
An aspirin tablet weighing 0.475 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved the tablet in hot NaOH and the cooled solution was diluted with DI water to the mark in a 250 mL volumetric flask. Exactly 3.00 mL of the solution was ...
Monday, April 18, 2011 at 4:23pm by CHEMCHEM
chem
An aspirin tablet weighing 0.650 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved the tablet in hot NaOH and the cooled solution was diluted with DI water to the mark in a 250 mL volumetric flask. Exactly 3.00 mL of the solution was ...
Sunday, April 20, 2008 at 6:01pm by un
Chemistry
A buffer is prepared by mixng 150.0 mL of 0.500 M ammonia, 250.0 mL of 0.200 M ammonium chloride and 600.0 mL of water. To this solution is added 50.0 mL of 0400 M hydrochloric acid. What is the final pH?
Wednesday, December 9, 2009 at 9:37pm by Cathy
chemistry
mL x M = mL x M 105 mL x 0.25 M = ??mL x 8 M. So you take ??mL of the 8 M and make it to a total volume of 105. The resulting solution will be 0.25 M.
Monday, January 25, 2010 at 7:10pm by DrBob222
CHEM AB HELP ASAP
I have a pre lab questions that are due in a few hours and I need help. Theres several questions In the titration of 25.00 ml of a water sample, it took 20.590 ml of 4.995x10-3 M EDTA solution to reach the endpoint. The total hardness is due to one or a combination of Ca2+, ...
Wednesday, October 17, 2012 at 3:17am by Lesle
Chemistry
Hg2+ + 2Cl- → HgCl Mercuric nitrate was standardized by titrating a solution containing 147.6 mg of NaCl(FM 58.44), which required 28.06 ml of Hg(No3)2 solution. Part a: Find the molarity of Hg(No3)2. I already calculated the molarity to be 0.04500 M Part b: When the...
Sunday, October 16, 2011 at 11:48pm by Asuna
medicine
I don't think adding salt would matter. The only one thing you're focusing on is how to make that 5% dextrose solution. (x mL)*(50) + 1000 mL = (1000 mL + x) mL)*(5)
Saturday, September 18, 2010 at 4:38pm by TutorCat
chemistry
Supposing the "68%" is 68% by weight: (0.255 L) x (0.150 mol/L) x (63.0130 g/mol) / 0.680 / (1.41 g/ml) = 2.51 ml The direct way would be to take 2.51 ml of the 68% solution and dilute it to exactly 255 mL. But as a practical matter, since measuring 2.51 mL ...
Saturday, July 30, 2011 at 12:31am by james to henry
Chemistry
A sample of 7.52 grams of Na OH is dissolved into 675 mL of aqueous M NaOH (assume no volume change). This solution is then poured into 1.95 gallons of water. (You may assume that the two volumes can be added.) What is the concentration of NaOH in the final solution? Answer in...
Thursday, September 23, 2010 at 8:48pm by Cheyenne
chemistry
A sample of oxygen at 25 degrees C occupies 697 mL. If this sample later occupies 1062 mL at 55 degrees C and 1.3 atm, what was its original pressure? Answer in units of atm
Monday, April 23, 2012 at 7:07pm by please help
Chemistry
M of the 75 mL = 58.2 mL x 6M/75 mL = 4.656M So the initial solution must have been 6M NaOH x 310 mL = 4.656M x ? mL Solve for ? mL, then subract 310 from it to see how much water was added.
Monday, March 19, 2012 at 12:27am by DrBob222
chem
To make things easier (on me to type) let's call fluoxymesterone just FLM. 13.0 x 10^-3 g FLM/500 mL = xx g FLM/mL. That is the stock solution. It is diluted 100.0 microliters to 100.0 mL. So the new solution is xx g FLM/mL x (100.0 x 10^-3 mL/100.0 mL) = yy g FLM/mL. To ...
Sunday, November 4, 2007 at 12:07am by DrBob222
ap chem
1% NaCl (w/w) means 1 g NaCl/100 g solution. Since the solution has a density of 1.071 g/mL, the 100 g solution must have a volume of v = m/d = 100/1.071 = 93.37 mL so we actually have 1g NaCl in 93.37 mL. We want to know how much is in 1 L. 1 g NaCl x (1000 mL/93.37 mL) = 10....
Thursday, February 24, 2011 at 12:36am by DrBob222
Science
10.0 g of KCl and 18.5 g of CaCl2 were dissolved in 500 mL of water. How many mL of 1.57 M AgNO3 solution would be required to precipitate all Cl- from the solution?
Friday, October 19, 2012 at 2:31pm by Jared
Chemistry II
A solution is made by mixing 38.0 mL of ethanol, C2H6O, and 62.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C?
Tuesday, July 17, 2012 at 8:47pm by Sam
chemistry
A potassium nitrate solution is prepared by dissolving 2.3 g of KNO3 in 25 mL of water. What is the concentration of this solution in units of grams of solute per 100 mL of solvent?
Friday, September 23, 2011 at 1:09pm by Bertsie
Chemistry
"A 25.0% solution of Al2(SO4)3 has a density of 1.75 g/ml. What is the mass of dissolved solute in 40.0 ml of solution?" How would one set this problem up?
Wednesday, December 8, 2010 at 11:30pm by Kathryn
Chemistry
If 535 Ml of gaseous HCL, at 26.5 degrees Celsius and 747mm Hg, is dissolved in enough water to prepare 625 ml of solution, what is the PH of the solution?
Wednesday, August 5, 2009 at 1:21am by ChemHurts
ap chem
A sample of 7.45 grams of NaOH is dissolved into 609 mL of aqueous 0.250 M NaOH (as-sume no volume change). This solution is then poured into 2.18 gallons of water. (You may assume that the two volumes can be added.) What is the concentration of NaOH in the final solution? ...
Sunday, September 16, 2012 at 11:09pm by cheri
Chem Lab Math!
What's the molarity of the solution? 1,000 mL x 1.037 g/mL x 0.37 = ?g HCHO. ?g HCHO/molar mass = moles and that is the molarity since the solution is 1 L.Abut 13M but you need to do that more accurately than I. final M = about 13M x (1.00/500) x (1.00/5.00) = ? (Note: ...
Sunday, March 18, 2012 at 9:41pm by DrBob222
Chemistry
The normal freeing point of cyclohexane if 6.6 degrees Celsius. A 0.2g sample of an unknown solute is dissolved in 50 ml of cyclohexane (d-0.8g/ml, Kf=20 degreesCelsius/m. If the freezing point of the solution is 3.6 degrees Celsius, what is the molar mass of the solute?
Wednesday, March 2, 2011 at 12:56am by Karolina
Chemistry
What is the molarity of the original solution? That will be 348.29 g/molar mass NaCl = moles and that is in 1.000L so that is the molarity. Technically you can't determine the molarity of the diluted solution because you don't give the density. IF you make the ...
Wednesday, August 24, 2011 at 2:19am by DrBob222
Chemistry
when 25.0 mL of a solution containing both Fe2+ and Fe3+ ions is titrated with 23.0 mL of 0.0200 M KMnO4 (in dilute sulfuric acid). As a result, all of the Fe2+ ions are oxidized to Fe3+ ions. Next, the solution is treated with Zn metal to convert all of the Fe3+ ions to Fe2+ ...
Thursday, December 15, 2011 at 5:34am by Albert
chemistry
My assumption, when you say 5.88% by volume that you mean 5.88% v/v or 5.88 mL acetic acid/100 mL solution. If that is so, then each mL solution contains 0.0588 mL acetic acid. mass = volume x density so mass = 0.0588 mL x 1.049 g/mL = ?? Change that to moles. moles = g/molar ...
Tuesday, September 15, 2009 at 2:08pm by DrBob222
Chemistry
A sample of 9.4 grams of NaOH is dissolved into 693 mL of aqueous 0.250 M NaOH (assume no volume change). This solution is then poured into 2.37 gallons of water. (You may assume that the two volumes can be added.) What is the concentration of NaOH in the final solution? ...
Monday, October 4, 2010 at 6:30pm by May
Redox Titration questions!
Oh goodness, I'm such a pain! I need some help with these! How do I calculate the percentage? How do I start it? 2. Imagine that you ran a similar titration using a different iron sample with 0.02 M KMnO4 as the titrant. Calculate the percent of iron in the sample if the ...
Wednesday, June 11, 2008 at 9:05pm by Angel
Chem
A sample of oxalic acid, H2C2O4, weighing 1.294 g is placed in a 100.0 mL volumetric flask, which is then filled to the mark with water. What is the molarity of the solution?
Wednesday, October 1, 2008 at 12:01am by Amis
AP Chemistry
A very old and tired , grey haired AP Chem instructor wanted to determine the Ka of an unlabelled monoprotic acid in his stockroom. He dissolved an unknown amount of acid in an unknown amount of water and proceeded to titrate the sample with a solution of NaOH of unknown ...
Sunday, February 24, 2013 at 2:42pm by Sarah
chemistry
A solution of ethanol (C2H5OH) in water is prepared by dissolving 87.4 mL of ethanol (density = 0.79 g/cm3) in enough water to make 250.0 mL of solution. What is the molarity of the ethanol in this solution?
Monday, January 3, 2011 at 4:42pm by bob
Chemistry
A solution of ethanol (C2H5OH) in water is prepared by dissolving 61.9 mL of ethanol (density = 0.79 g/cm3) in enough water to make 250.0 mL of solution. What is the molarity of the ethanol in this solution?
Wednesday, October 27, 2010 at 11:58pm by Andrea
chem
A solution of ethanol (C2H5OH) in water is prepared by dissolving 57.0 mL of ethanol (density = 0.79 g/cm3) in enough water to make 240.0 mL of solution. What is the molarity of the ethanol in this solution?
Saturday, November 3, 2007 at 11:31pm by mel
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 61 male firefighters are ...
Sunday, June 20, 2010 at 1:29pm by Jack
chemistry
I fyou had only 12g of KOH remaining in a bottle, how many ml of 12.8%(w/v) solution could you prepare? (in mL) How many ml of 0.29 M solution could you prepare using 12 g of KOH?
Sunday, November 21, 2010 at 5:57pm by nicole
science
Available is a 5 M/liter solution. You need 100 mL of a 0.91 M solution. In units of moles, you need 0.91 mol/liter * 0.1 liter = 0.091 moles of HNO3 0.091 moles / (5moles/liter) = 0.0182 liters of the 5 M solution. Take 0.0182 liters of the 5 M solution, and dilute to 100 mL...
Monday, December 17, 2012 at 7:33pm by Jennifer
Chem
In procedure B2, you will titrate a saturated solution to find out how much of the anion dissolved. Assume you we're able to dissolve about 0.12g of potassium hydrogen tartrate in 25.0 mL of water. For the titration, you will use 10.00mL of this sample. How many mL of 0....
Friday, March 8, 2013 at 8:44pm by K
chemistry
You are asked to prepare 150.0 mL of 3.15×10−2 M AgNO3. 2.) An aqueous solution is 6.40% methanol CH3OH by mass, with d = 0.988 g/mL} What is the molarity of CH3OHOH} in this solution?
Tuesday, February 16, 2010 at 4:34pm by Andrew
Chem
calculate pH of the buffer solution prepared by mixing 10 mL of 1.5 M HCl with 100 mL of 0.1 M K2CO3 solution. For H2CO3: Ka1= 4.46 e^-7, Ka2= 4.69e^-11
Wednesday, November 12, 2008 at 10:52pm by Sam
Chemistry
I have a solution made up of 100 ml of distilled water and 2.0g of NaOH. I need to determine the total volumeof the solution in order to the calculate the mass of the reaction mixture. How do I do this? We are to assume the density of the solution is the same as pure water, 1....
Wednesday, April 28, 2010 at 7:57pm by Jim
chemistry
What is the molarity of the Cl- ion in the solution of a sample containing 0.187g Cl- dissolved in 50.0 ml water?
Tuesday, October 23, 2007 at 10:13pm by mel
chemistry
A 3.0% by mass solution of H2O2 contains 3.0 g of H2O2 per 100 g of solution. (3.0 g H2O2 / 100 g solution) x (1.01 g solution / 1 mL solution) x (1000 mL / L) = 30.3 g H2O2 / L (30.3 g H2O2 / L) x (1 mole H2O2 / 34.01 g H2O2) = 0.8909 moles H2O2 / L = 0.89 M to 2 sig figs
Wednesday, November 17, 2010 at 11:50pm by Dani
Chemistry
1. A sample of argon gas is at a pressure of 1.24 x 10^4 kPa and a temperature of 24°C in a rigid 25-L tank. How many moles of argon does this tank contain? I ended up with .130 but its 130 Can someone tell me what I did wrong? This whole chapter on gases is really ...
Wednesday, August 11, 2010 at 1:34am by Anonymous
Chemistry
a 15ml sample of sulfuric acid was titrated against a solution of .0100 mol per litre of sodium hydroxide. to bring about neutralization, 25.00 ml of sodium hydroxide solution was required. calculate the concentration of the sulfuric acid
Thursday, January 24, 2013 at 7:16pm by Omaaaaaaaar
Chemistry
a solution is made by combining 5 mL of .2M HC2H3O2, 5 mL of .2M NaC2H3O2, and 10 ml of water. calculate the molarity of HC2H3O2 and of NaC2H3O2 in this new solution
Monday, March 28, 2011 at 1:00pm by Anonymous
Chemistry
i kinda understand waht you're saying. to be a bit more clear this is from a lab, and here are the volumes we retrieved: Volume of Concentrated NaOH soultion (mL) = 9.00 mL Concentration of Concentrated NaOH soultuon (M) = 6.00 M Volume of Stock Solution after Dilution (mL...
Friday, October 31, 2008 at 10:12am by Vanessa
urgent chem help ( dr bob plz)
A particular household ammonia solution (d= 0.97g/mL) is 6.8% NH3 by mass. How many milliliters of this solution should be diluted with water to produce 650 mL of a solution with pH = 11.55? ------------------------- i am gettig 5.3 x 10^-10 is tht rite or worng pzl conform ..
Tuesday, February 17, 2009 at 9:44pm by javeya
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
chemistry
You have four beakers labeled A, B, C, and D. In beaker A, you place 100 grams of silver nitrate and enough water to make 50 mL of solution. In beaker D, you place 100 grams of KCl and enough water to make 100 mL of solution. You also pour 100 mL of water into beaker B and 200...
Thursday, April 24, 2008 at 11:38pm by brandi
Chemistry
Suppose 50.0 mL of an aqueous solution containing an unknown monoprotic weak acid is titrated with 0.250 M KOH. The titration requires 31.52 mL of the potassium hydroxide solution to reach the equivalence point. What is the concentration (in molarity) of the unknown acid ...
Monday, March 5, 2012 at 10:52am by Chill
chem
In 100. mL solution contain 5.0 mL of solute and 95 mL of a water. The concentration is
Wednesday, October 17, 2012 at 2:56pm by Anonymous
chemistry
How much of solution 1 is mixed with how much of solution 2. Won't it make a differen First, the formula for sucrose is C12H22O11. For the 0.1495 M soln. density = 1.018 g/mL so 1 L has a mass of 1.018 g/mL x 1000 mL = 1018 grams. How much sucrose is in that? 0.1495 moles ...
Wednesday, February 17, 2010 at 3:15pm 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
analytical chemistry
Calculate the volume (mL) of 2.81 M magnesium phosphate solution require to prepare 43.20 mL of 2.1000 %w/v solution of Mg3(PO4)2 . [Answer in 3 decimal places].
Wednesday, February 15, 2012 at 12:13pm by donald
Chemistry
you have 20 ml of 0.1 M aqueous solution of the weak base (CH3)N (Kb = 7.4 x 10^-5). This solution will be titrated with 0.1 M HCl. how many ml of acid must be added to reach the equivalence point?
Wednesday, February 8, 2012 at 6:17pm by laura
chemistry (continued)
i kinda understand waht you're saying. to be a bit more clear this is from a lab, and here are the volumes we retrieved: Volume of Concentrated NaOH soultion (mL) = 9.00 mL Concentration of Concentrated NaOH soultuon (M) = 6.00 M Volume of Stock Solution after Dilution (mL...
Friday, October 31, 2008 at 10:40am by Vanessa
statistics
14. 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 61 male firefighters ...
Sunday, December 19, 2010 at 12:41am by Anonymous
Chemistry
A sample of 6.41 grams of NaOH is dissolved into 675 mL of aqueous 0.250 M NaOH (assume no volume change). This solution is then poured into 2.28 gallons of water. (You may assume that the two volumes can be added.) What is the concentration of NaOH in the final solution? ...
Tuesday, March 22, 2011 at 8:25pm by Scott
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 ...
Thursday, June 24, 2010 at 5:06pm by stan
chemistry
a sucrose solution with a volume of B uL has a density of C g/ml. the solution is D % sucrose by mass. if i added x ml of this sucrose to another solution, how many grams sucrose did I add?a sucrose so
Tuesday, January 24, 2012 at 1:05pm by neece
chemistry
A 25 mL solution of .5M NaOH is titrated until neutralization into a 50mL sample of HCl. What was the concentration of HCl?
Tuesday, February 22, 2011 at 10:56pm by E
Chemistry
what is the molecular weight (G/mol) of a diprotic acid 0.43 sample that needed 35.46 ml of 0.100 M of NaOH solution to reach a phenolphthalein point?
Monday, January 24, 2011 at 9:03pm by Judy
Ap chemistry
A 20mL sample of .200M potassium dichromate solution is added to 30 ml of .4M silver nitrate. What is the balnced molecular equation?
Monday, November 29, 2010 at 11:22am by Sarah McKee
Chemistry
I don't know. The close answer is mols sucrose = grams/molar mass Then M = mols/L SOLUTION. Dissolving the solid in 100 mL ethanol makes the SOLUTION greater than 0.1 L. I'm sure the author of the problem meant for you to ignore the difference and use 0.1 L; however ...
Monday, December 3, 2012 at 9:50pm by DrBob222
chemistry
What is the percent by mass of 3.55 g NaCl dissolved in 88 g H2O? 2. A solution is made by adding 1.23 moles of KCl to 1000.0 g of water. What is the % by mass of KCl in this solution? 3. If you have 100.0 mL of a 25% aqueous solution of ethanol, what volumes of ethanol and ...
Thursday, February 10, 2011 at 8:53pm by Anonymous
chem
A student placed 12.0grams of glucose in a flask added enough water to dissolve glucose by swirling then added additional water until the .100 ml mark. A 60.0ml sample of this glucose soon was diluted to 0.500 L. How many grams of glucose are in 100. ml of the final solution.
Monday, September 19, 2011 at 7:45pm by ALISON
help!!!!!
1. A sample of air was found to contain 21% oxygen by volume. how many ml of oxygen are present in 2.0 L of air? 2. A 25.0g solution containing salt and water is 2.2% salt by mass. what is the mass (in g) of salt in the solution? please show me how to solve :)
Tuesday, September 13, 2011 at 9:03pm by Anonymous
Chemistry
Molarity of NaOH solution = 0.06115 Volume of NaOH used = 15.50 mL Volume of unknown Sample = 10.00 mL Find the Moles of NaOH used? Find the molarity of H3PO4? Thanks!
Wednesday, October 10, 2012 at 8:18pm by Fred
CHEMISTRY
A 8.90-g sample of ethane, C2H6, is mixed with 18.8 atm of O2 (an excess) in a 1.50 L combustion chamber at 130.0°C. The combustion reaction to CO2 and H2O is initiated and the vessel is cooled back to 130.0°C. What is the final pressure in the combustion chamber ...
Thursday, January 17, 2008 at 8:04pm by Matt
Chemistry
A solution of magnesium chloride, MgCl2, is prepared by dissolving 19.0g of MgCl2 in 250 mL OF water. a.) Calculate the weight percent of magnesium chloride in solution. b.)The denstiy of the above solution is 1.05 g/mL. Calculate the molarity of the magnesium chloride ...
Wednesday, October 24, 2012 at 8:22pm by Josh
chemistry
A 23.596 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 79.504 g of water. A 13.803 g aliquot of this solution is then titrated with 0.1098 M HCl. It required 29.02 ml of the HCl solution to reac the methyl red endpoint...
Monday, November 14, 2011 at 3:25am by Mike
Chemistry
A 23.596 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 79.504 g of water. A 13.803 g aliquot of this solution is then titrated with 0.1098 M HCl. It required 29.02 ml of the HCl solution to reac the methyl red endpoint...
Monday, November 14, 2011 at 12:31am by Mike
chemistry
moles AgNO3 = M x L = ?? moles Cl^- is the same since the equation is a 1:1 ratio. Cl^- + Ag^= => AgCl. grams Cl = moles Cl^- x atomic mass Cl. %Cl^- = (mass Cl^-/mass sample)*100 = ?? Note: mass of the sample is 1/10 x 0.5324g since you took a 25 mL aliquot of the 250 ...
Monday, April 4, 2011 at 6:51pm by DrBob222
Calc
You are a lab technician and must create 250 ml of a 17% salt-solution. a. If you have 500 ml of 28% salt-solution, how many milliliters of it should you mix with water in order to create 250 ml of a 17% salt-solution? b. If you have 400 ml of 40% salt-solution, how many ...
Thursday, February 16, 2012 at 10:16am by Fatih
math
You are a lab technician and must create 250 ml of a 17% salt-solution. a. If you have 500 ml of 28% salt-solution, how many milliliters of it should you mix with water in order to create 250 ml of a 17% salt-solution? b. If you have 400 ml of 40% salt-solution, how many ...
Wednesday, February 15, 2012 at 8:45am by Fatih
chemistry 1st year, for midterm help
Hi, Can any1 help with theses questions. I need to solve these because there will be similar questions on the midterm for me, coming week. Btw I have tried few. 1. How many milliliters of a 15.0%, by mass solution of KOH (Aq) ( d= 1.14g/mL ) are required to produce 27.0 of a ...
Wednesday, February 11, 2009 at 11:10pm by ur class fella
chemistry
I am doing a home lab experiment about acid-base neutralization. I just need a little help to see if I am doing it correctly. I completed the experiment and recorded the data. We were to add 25 ml of vinegar and the 1 ml of cabbage indicator, the add i ml of ammonia at a time ...
Saturday, March 6, 2010 at 7:47am by Lynn
chemistry
A 31.0 mL solution of 0.155 M iron (III) perchlorate is prepared. This solution is then titrated with 27.1 mL of 0.250 M potassium hydroxide. What is the concentration of iron (III) perchlorate that remains in the solution?
Monday, October 1, 2012 at 9:49pm by Anonymous
biochemistry
An enzyme sample contains 24 mg protein/mL. Of this sample, 20 microliters in a standard incubation volume of 0.1 mL catalyzed the incorporation of glucose into glcogen at a rate of 1.6 nmol/min. Calculate the velocity of the reaction in terms of the following: A)micromoles/...
Sunday, February 17, 2008 at 3:16pm by stew
chemistry
You have 20 mL of a 0.1 M aquesous solution of the weak base (CH3)3N (Kb = 7.4x10^-5). This solution will be titrated with 0.1 M HCl. how many mL of acid must be added to reach the equivalence point?
Wednesday, February 8, 2012 at 11:19pm by laura
chemistry
if I add water to 100.0 mL of a 0.15 M NaOH solution until the final volume is 150.0 mL what will the molarity of the diluted solution be? If I set this up properly I believe it is 0.10 M.....am I correct?
Sunday, April 3, 2011 at 10:47am by carla
Chemistry
You have a stock solution of 5.0 M H2SO4. How many mL of stock solution are required to make 136 mL of 1.6 M H2SO4 solution
Monday, April 8, 2013 at 3:46pm by Linzy
science
Compound B is provided as a solution and has a specific gravity of 0.65 (Specific gravity is the weight in grams per mL of solution) and is known to be 90% pure (each gram of compound B solution only contains 90% Compound B and 10% of degradation products). 4.5 mL of Compound...
Friday, December 9, 2011 at 4:16pm by jake
chemistry
4. Compound B is provided as a solution and has a specific gravity of 0.65 (Specific gravity is the weight in grams per mL of solution) and is known to be 90% pure (each gram of compound B solution only contains 90% Compound B and 10% of degradation products). 4.5 mL of ...
Thursday, December 8, 2011 at 5:40pm by jenny
chemistry
4. Compound B is provided as a solution and has a specific gravity of 0.65 (Specific gravity is the weight in grams per mL of solution) and is known to be 90% pure (each gram of compound B solution only contains 90% Compound B and 10% of degradation products). 4.5 mL of ...
Thursday, December 8, 2011 at 5:40pm by jenny
Chemistry
Calculate the pH of a 25 mL distilled water sample after the addition of 2 mL of HCl Calculate the pH of a 25 mL distilled water sample after the addition of 2 mL of NaOH
Sunday, March 13, 2011 at 7:55pm by Kara
Chemistry
Calculate mass of iron in tablet by spectroscopy? I have to calculate the mass of iron in a tablet..The manufacturers claim it contains 60 mg elemental iron. background info: The tablet was crushed and dissolved in 25ml of 6M Hcl, filtered and added to a 100ml volumetric flask...
Tuesday, February 14, 2012 at 5:36am by Drake
chemistry
What is the ion in the resulting solution? 100.0 mL of 0.015 M K2CO3 and 100.0 mL of 0.0075 M BaBr2? 25 mL of 0.57 M Ni(NO3)2 and 100.0 mL of 0.150 M NaOH
Monday, October 24, 2011 at 8:25pm by dude
chemistry
A 600ml sample of a saturated solution of MgCO3 is reduced to 125 ml by evaporation. What mass of MgCo3 is formed? Ksp=4*10^-5
Sunday, March 25, 2012 at 5:22pm by maureen
chemistry please help
An enzyme sample contains 24 mg protein/mL. Of this sample, 20 microliters in a standard incubation volume of 0.1 mL catalyzed the incorporation of glucose into glcogen at a rate of 1.6 nmol/min. Calculate the velocity of the reaction in terms of the following: A)micromoles/...
Saturday, February 16, 2008 at 2:31pm by stew
Chemistry
A 25.00 mL sample of a clear saturated solution of PbI2 requires 14.3 mL of a certain AgNO3(aq) for its titration. I^-(from satd PbI2)+ Ag^+(from AgNO3)= AgI(s) So, this is where I am. using the Ksp equation for PbI2: 7.1*10^-9=4x^3 solving for x gives me 0.00121 Giving the ...
Sunday, March 18, 2012 at 5:18pm by Ash
chemistry
I did (2.8333mol x 120mL x 2mol FeCl3)/ (1000ml x 6mol) got .113332mols and converted to mL by You are right to here with 0.1133 moles FeCl3. Then M = moles/L and rearrange to L = moles/M = 0.1133/4.43 = 0.02558 L = 25.58 mL. However, there is a flaw in the problem. Since you ...
Friday, June 4, 2010 at 9:08pm by DrBob222
Chemistry
How do I do this problem? 1. A student did an alkalinity determination correctly, except that the sample titrated had a volume of 90.0 mL. Volume A was found to be 4.50 mL and Volume B was 7.00 mL. a) Calculate the alkalinity value from these data and then calculate the ...
Tuesday, March 13, 2007 at 10:36pm by Joe
Chemistry
Calculate the volume of 2.45 M NaI that would be needed to precipitate all of the Hg+2 ion from 185 mL of a 2.44 M Hg(NO3)2. AND Calculate the molarity of an acetic acid solution if 47.81 mL of the solution is needed to neutralize 147 mL of 1.32 M sodium hydroxide.
Monday, May 6, 2013 at 3:52pm by Marsha
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