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July 3, 2015

Search: Calculate the molarity of a solution of sodium hydroxide, NaOH, if 23.64 mL of this solution is needed to netralize 0.5632 g of potassium hydrogen phthalate

Number of results: 48,018

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.
December 3, 2010 by Sara

chemistry
If 5.20 g of HCl is added to enough distilled water to form 3.00 L of solution, what is the molarity of the solution? [Use molecular weight: HCl, 36.46 amu]
October 29, 2011 by Chemistry Chick

Chemistry
0.000341 g fluorescein (332.32 g/mol) is dissolved in 255 mL solution of ethanol. The density of ethanol is 0.785 g/mL. What is the concentration of the solution in molarity (M)?
July 16, 2012 by Anon

chemistry
What is the percent by volume (% v/v) of a solution made by mixing 12 ml of ethanol (C2H5OH) with 48 ml of water? b) Assuming the density of ethanol is 0.789g/ml, what is the molarity of this solution?
March 19, 2013 by ben

Math
A 12% solution and a 24% solution are to be mixed to create 80 mL of a 16% solution. How much of each should be used? Is the correct answer 53 1/3 L of the 12% solution and 26 2.3 of the 24% solution?
February 12, 2013 by Alyonka

math
A doctor needs to administer 2 mL of a 100 mg/mL solution to a 200-pound patient. However, the doctor has the solution available only in 20 mg/mL strength. What volume of the 20 mg/mL solution would be needed to administer the desired dose?
January 1, 2012 by Jamie

Chemistry
If 0.10 mg Fe is diluted in a 50 mL flask, what is the concentration of the resulting solution? What volume of the resulting solution is needed to prepare 25.0 mL of a dilute sample solution with a concentration of 0.30 ppm Fe?
November 8, 2012 by Lisa

chemistry
An aspirin tablet weighing 0.502 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 ...
January 27, 2008 by John

chemistry
An aspirin tablet weighing 0.502 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 ...
January 28, 2008 by Anonymous

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 ...
April 18, 2008 by Un

chemistry
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 ...
January 26, 2009 by leah

Chem.
An aspirin tablet weighing 0.400 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 ...
April 18, 2009 by Joanne

Chemistry
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 ...
January 21, 2011 by

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) = ...
October 31, 2008 by Vanessa

Chemistry
A 20.0mL 0.3M HCl solution is titrated with 0.4M NaOH. What is the exact pH of the solution before titration? And what is the pH at the equivalence point?(are there any straightforward formulas to use on this kind of problem?)
March 18, 2013 by Sue

Chemistry
A 20.0mL 0.3M HCl solution is titrated with 0.4M NaOH. What is the exact pH of the solution before titration? And what is the pH at the equivalence point?(are there any straightforward formulas to use on this kind of problem?)
March 18, 2013 by Sue

chemistry
8.00g of NaOH are dissolved in water to make 4.00L of solution. What is the concentration of hydronium ions, [H3O+], in this solution? Express your answer with the appropriate units.
November 7, 2014 by Anonymous

Chemistry
A .682 g sample of an unknown weak monoprotic acid, HA, was dissolved in sufficient water to make 50mL of solution and was titrated with a .135 M NaOH solution. After the addition of 10.6mL of base, a pH of 5.65 was recorded. The equivalence point was reached after the ...
May 10, 2007 by Sara

Chemistry
A. The forensic technician at a crime scene has just prepared a luminol stock solution by adding 13.0 g of luminol into a total volume of 75.0 mL of H2O. -What is the molarity of the stock solution of luminol? B. Before investigating the scene, the technician must dilute the ...
October 12, 2008 by Irvin

Chemistry 130
Can someone please help me and let me know if these questions and answers are correct? I just need a second opinion…and if there not correct can you help me…please?!? 1.(3). In the Arrhenius definition, an acid is a substance that a. turns litmus paper from blue to red b. has ...
October 6, 2009 by Jess

Chemistry
I hae a solution that contains 30 lbs of sugar in 2.5 gallons of water. Calculate the mass percent, molarity, molality and mole fraction.
October 27, 2011 by Pam

Chemistry
I have a solution that contains 30 lbs of sugar in 2.5 gallosn of water. Calculate the mass percent, molarity, molality and mole fraction
October 27, 2011 by Pam

Chemistry
The density of a solution of 3.69g KBr in 21.70g H2O is 1.11g/mL. What is the molarity of KBr in the solution.
October 10, 2010 by Jude

chemistry
what is the molarity of a solution containing 23g of NaCl in 500 mL of solution? (the molecular mass of NaCl is 58.44.)
April 28, 2011 by lilly

Chemistry
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) If 2.00 g of Mg reacts completely with 50.0 mL of HCl solution, what is the molarity of the HCl solution?
July 9, 2011 by Jayne

chemistry
What mass in grams of potassium hydroxide is contained in 500 mL of solution that has a pH of 11.5? I have a pOH of 2.5 to get [OH] I do 10^-2.5 to get 0.001581138 Then I divide this by 2 to find the mols in 500 mL Then, grams = mols x molar mass = 0.00158``38 x 56.105 g/mol =...
April 7, 2008 by Dustin

Chemistry, #3
Thallium hydroxide is a strong base used in the synthesis of some organic compounds. Calculate the pH of a solution containing 2.55 g TIOH per liter. Sorry! I'm having a really hard time with this acid/base stuff! TlOH is a strong base as the problem says. Do it just as you ...
August 4, 2007 by Taasha

chemistry
What is the concentration of Ag+ remaining in solution? Calculate the following when 0.250 L of 0.249 M AgNO3 solution is mixed with 0.350 L of 0.300 M Na2CO3 solution. Ksp for Ag2CO3 is 8.46E-12. A) What mass of the precipitate forms? I found out the answer: 8.59 g. But I don...
March 31, 2012 by hellp

Gen cmehistry
Calculate the hydroxide ion concentration in an aqueous solution that contains 3.50 x 10-3 M in hydronium ion.
April 21, 2010 by asasas

Chemistry.
If 6.02 moles of potassium react with a 0.8 M silver acetate solution, how many L of silver acetate are needed?
March 5, 2012 by Victoria

Chemistry.
If 6.02 moles of potassium react with a 0.8 M silver acetate solution, how many L of silver acetate are needed?
March 5, 2012 by Victoria

Chemistry
Calculate the mass of copper needed to displace 5.0g of silver from silver nitrate solution. Cu+2AgNO3->Cu(NO3)2+2Ag (Relative atomic masses:Ag=108,Cu=63.5) I got it to be 3.175g needed.
January 18, 2008 by Anonymous

chemistry
What mass of solid sodium acetate, NaCH3COO, must be added to 2.50 L of an aqueous solution of 0.55 M acetic acid, CH3COOH, in order to make a buffer solution whose pH is 4.50 ? Assume that adding the solid does not change the volume of the solution. Use the simultaneous ...
December 6, 2014 by airman

hemistry
sodium is manufactured commercially by electrolysis of molten sodium chloride. explain why it is not possible to use sodium chloride solution for this.
March 15, 2011 by Anonymous

chemistry
sodium is manufactured commercially by electrolysis of molten sodium chloride. explain why it is not possible to use sodium chloride solution for this.
March 15, 2011 by Anonymous

Chemistry- HW Check
I have seven homework problems. I did them but I wasn't sure if I did them correctly. Did I do them correct? Thank you! Give the reaction that describes how the hydrazine, N2H4(aq), / hydrazinium ion, N2H51+(aq), buffer reacts with a strong base such as sodium hydroxide. N2H4(...
November 15, 2011 by Maegan G

chemistry
the density at 20 degrees celcius of a .258m solution of glucose in water is 1.0173 g/ml, and the molar mass of glucose is 180.2 g/mol. What is the MOLARITY of the solution?
October 20, 2008 by Eric GReenblatt

chemistry
The molarity of urea in a solution prepared by dissolving 16 g of urea (MW = 60.0 g/mol) in 39 g of H2O is __________ M. The density of the solution is 1.3 g/mL. i get 8.9 but the practice test says the answer its 6.3
September 26, 2010 by BenY

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?
March 11, 2013 by mj

chemistry
A 25.0-ml sample of 1.00M KBr and a 75.0-ml are mixed. The solution is then heated to evaporate water until the total volume is 50.0 ml. What is the Molarity of the KBr in the final solution
February 9, 2014 by Mary

Quick chemistry check
Please check each of these mole statements. Correct me if I'm wrong! 1. 59g of hydrochloric acid (HCL)=____moles I got 1.6 moles 2. 4.6 moles of sodium hydroxide (NaOH)=___ grams I got 184 grams 3. 35.0 of sulfuric acid (H2SO4)=__ f.u sulfuric acid I got 2.15x10^25th power ...
February 25, 2015 by Anonymous

chemistry
how many grams of sodium metal are needed to give 781 g of hydrogen?
March 13, 2014 by nicole

chemistry
what mass (in grams) of solid potassium permanaganate is required to prepare 250mL of a 0.02 M of potassium permanaganate solution?
September 23, 2009 by Hannah

chemistry
what mass (in grams) of solid potassium permanaganate is required to prepare 250mL of a 0.02 M of potassium permanaganate solution?
September 23, 2009 by Hannah

Chemistry
How many mL of a stock solution of 2M potassium nitrate would you need to prepare 100mL of .150 M potassium nitrate?
May 16, 2012 by Lis

Chemistry
How many grams of a 17.7% potassium sulfate solution would contain 419.9 g potassium sulfate? Answer in units of g
March 13, 2014 by Kristen

chemistry
how many grams of NAOH are needed to make a 2.00 molal solution? I got stuck here 2.00 molal=2.00 mole/kg molecular weight of NAOH= 40g/mol (2.00 g/molecular weight x kg) x 40 g/mol= stuck thanks jim
January 30, 2010 by Jim_R

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

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

Chemistry
Can i please get a formula to calculate the concentration of an acid when it reacts with a standard solution? ( preferably 0.1 M NaOH and viniger )
August 5, 2010 by Daniel

Chemistry
Hi please help with this. You will mix 5 ml of each 2M HCL and 2M NaOH solutions, calculate the concentration of NaCl formed in the new solution?
October 17, 2010 by John

Chemistry
How many grams of sodium-hydroxide will react with 49g of phosphoric acid? H3PO4=98g/mol,NaOH=40/mol.The equation is:3H2O+Na3PO4
April 23, 2012 by faisal

college chemistry
An aspirin tablet weighing 0.502 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 ...
January 24, 2010 by Alexander

Fractions
A technician has prepared three solutions from a 600 mL stock solution. • In preparing the first solution ½ of the original volume of the stock solution was used. • The second solution required ¼ of the remaining stock solution. • Preparation of the third solution used 3/5 of ...
November 12, 2012 by anna

Math - urgent
2. A technician has prepared three solutions from a 600 mL stock solution. • In preparing the first solution ½ of the original volume of the stock solution was used. • The second solution required ¼ of the remaining stock solution. • Preparation of the third solution used 3/5 ...
November 12, 2012 by anna

Biochemistry
What is the pH of a solution prepared by mixing 150 mL of 0.1M HCl with 300mL of 0.1M sodium acetate (NaOAC) and diluting the mixture of 1L? PKa of acetic acid is 4.76. and give solution
October 22, 2014 by Maina john

Chemistry
What molarity of NaOH would produce a pH of 10? And how do you calculate it?
April 16, 2008 by Ashley

chemistry
If you add 5.0 mL of 0.50 M NaOH solution to 20.0 mL to Buffer C, what is the change in pH of the buffer? (where buffer C is 8.203 g sodium acetate with 100.0 mL of 1.0 M acetic acid) I have calculated the pH of buffer C to be 4.74. Now what? =\
November 7, 2010 by Chelsea

Chemistry
The molecular weight of glucose is 180.2 and the molecular weight of lactose is 342.3. What is the molarity of a 25% glucose solution? What is the molarity of a 25% lactose solution? I know that molarity = mol/L or mol/1000 mL and that molecular weight is g/mol. But I'm not ...
February 10, 2009 by Susie

Chemistry
Suppose a student used 28.4 ml of 0.100 M NaOH solution to neutralize the 25.0 ml of the lemon juice sample which contains citric acid (H3A)in it. H3A + 3NaOH -----> Na3A + 3H2O Molar mass of citric acid = 192.2 g/mole a)What is the molarity(M)of citric acid(H3A)in lemon ...
December 14, 2014 by Nam Le

Math Algebra , high school
A biologist has three salt solutions: some 5% solution, some 15% solution, and some 25% solution. She needs to mix some of each to get 50 liters of 20% solution. She wants to us twice as much of the 5% solution as the 15% solution. How much of each solution should she use? How...
December 13, 2012 by Gina

Chemistry
A buffer solution is prepared by mixing 50.0 mL of 0.300 M NH3 with 50 mL of 0.300 NH4Cl. The pKb of NH3 is 4.74. NH3 + H2O-> NH4+ +OH- 7.50 mL of 0.125 M HCl is added to the 100 mL of the buffer solution. Calculate the concentration of NH3 and NH4Cl for the buffer solution...
April 10, 2014 by Dee

chemistry
Calculate the change in pH when 4.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). Delta pH=? Calculate the change in pH when 4.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution. Delta pH=?
July 8, 2012 by rachel

vapor and osmotic pressure
A solution of the sugar mannitol ( molar mass 182.2 g/mol ) is prepared by adding 54.66 g of mannitol to 1.000 kg of water. The vapor pressure of pure liquid water is 17.54 torr at 20o C. Mannitol is nonvolatile and does not ionize in aqueous solution. a.) Assuming that ...
October 12, 2006 by Amy

Chemistry
Determine the number of grams of Potassium Iodate present in 10.0 g of a 0.267 m Potassium Iodate solution.
February 1, 2015 by Bethany

chemistry
A solution is made by adding 5.0 g Na2CO3 * 10H2O to enough water to make a 500 mL solution. what is the molarity. I have: M=mol solute/liter solution = (5/286)/.5 = .035M 286 is what i got for the molar mass of Na2CO3 * 10H2O Is that correct?? I think it is, but the next ...
May 3, 2010 by Maggie

chemistry
calculate the hydroxide ion concentration in a solution of almond extract PH.3.8.state if almond is basic or acid
April 25, 2013 by demi

chemistry
How many milliliters of 0.602M hydrochloric acid (HCl(aq)) must be added to 15.00mL of 0.538M sodium hydroxide (NaOH(aq)) to reach the equivalence point? Report your answer to 2 decimal places.
March 28, 2013 by Anonymous

Chemistry
A solution is made by dissolving 10.9 g of calcium chloride, CaCl2,in enough water to make exactly 500 mL of solution. What is the concentration (molarity) of CaCl2 in mol/L?
July 24, 2010 by Shelia

chemistry
Use the following balanced equation. 3Sr(OH)2 + 2H3PO4 --> 6H20 + Sr3(PO4)2 20 mL of H3PO4 is required to react with 40 mL of a 0.15 M Sr(OH)2 solution. What is the molarity of the H3PO4 solution?
June 20, 2011 by Brea

chemistry
What is the molarity of a salt solution in which 117.0 grams of salt (NaCl) is dissolved in water to give 5.00 L of solution? Show all work including units.
August 23, 2011 by len

chemistry
What is the molarity of a solution containing 8 grams of solute in 500 mL of solution? Round to the nearest hundredth. Don't forget the unit! (gram formula mass of solute = 24 g)
September 30, 2011 by archie

chemistry
What is the molarity of a solution containing 8 grams of solute in 500 mL of solution? Round to the nearest hundredth. Don't forget the unit! (gram formula mass of solute = 24 g)
September 30, 2011 by archie

chemistry
determine the molarity of a 18 ml sample of HCl solution that is required to prepare 30 ml of 2.3 M HCl solution?
February 11, 2011 by linda

chemistry
what is the molarity of a HCl solution that contains 13.0 g of HCl in 125 mL of solution? Answer in units of M
March 8, 2012 by please help !

Chemistry
A 15.0 mL sample of 0.250 M H2SO4 is neutralized by 20.5 mL of KOH solution. What is the molarity of the KOH solution?
October 8, 2012 by Audrey

chemistry
A solution contains 5.00% (by mass)NaCl. The density of the solution is 1.064 g/cm^3. What is the molarity of NaCl?
November 19, 2012 by evelyn

Chemistry lab
1) Using the 1st equivalence point from part a calculate the molarity of the phosphoric acid. Molarity of NaOH = .1523 M Volume of phosphoric acid used 10.0mL Volume at equivalence point 7.410 mL and 14.861 mL 2) Using the 2nd equivalence point from part a, calculate the ...
April 11, 2012 by Maura

SCI/241
Hello, I have to answer this question for my assignment. Compare and contrast how different electrolytes-sodium, potassium, and chloride-function in the body. This is what I have so far but I am not sure if this is the whole answer. The Electrolytes in your body are sodium and...
December 10, 2010 by Nikol

molarity
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 ...
February 16, 2007 by christine

Chemistry
I really need help with this question. If 2 trials using 10.0 mL of a solution with an unknown concentration were titrated using close to 20mL of a standard solution each trial, what approximate volume of the standard solution would be needed to titrate 20mL of the solution ...
February 28, 2012 by Missy

chemistry
sorry i forgot some of the units in the initial posting 8.00g of NaOH are dissolved in water to make 4.00L of solution. What is the concentration of hydronium ions, , in this solution?
November 2, 2009 by katy

Chemistry
I am having trouble with how to approach this problem. I have the solution but can't figure out how to get it. How many moles of NaOH must be added to 1.0 L of 2.0M HC2H3O2 to produce a solution buffered at each pH? a) pH=pKa b)pH=4 c)ph=5
April 12, 2010 by Larry

chemistry
I am having trouble with how to approach this problem. I have the solution but can't figure out how to get it. How many moles of NaOH must be added to 1.0 L of 2.0M HC2H3O2 to produce a solution buffered at each pH? a) pH=pKa b)pH=4 c)ph=5
April 12, 2010 by heather

Chemistry
What volume of solution do you have if you know you dissolved 0.0500g nitric acid to make solution that was determined to be 0.0793M (molarity). My teacher gave 10.0 mL as the answer, but I got .0098. Not quite sure where I went wrong.
May 20, 2012 by Lindsey

Chemistry
1. Which of the following metals is oxidized by calcium ions? *potassium zinc iron lead 2. The first electrochemical cell was invented by ____. Michael Faraday *Alessandro Volta James Maxwell Benjamin Franklin 3. Why can't a lead storage battery be recharged indefinitely? A ...
March 28, 2013 by Jack

Chemistry
2.500g sample of a mixture of sodium carbonate and sodium chloride is dissolved in 25.00ml of 0.798M HCl. Some acid remains after the treatment of the sample. If 28.7 ml of 0.0108M NaOH were required to titrate the excess hydrochloric acid how many moles of sodium carbonate ...
March 3, 2009 by eliz

chemistry
The concentration of HNO3 in a solution is 3.50 10-6 M. What is the [H3O+] in the solution? _______M What is the [OH-] in the solution? ________ M What is the pH of the solution? What is the pOH of the solution?
December 21, 2010 by jim

CHEMISTRY
Ion Concentrations 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 ...
October 25, 2013 by Anonymous

Chemistry
A 10 mL sample of 1.5 M Potassium Phosphate is placed in a 100 mL volumetric flask and diluted to the mark. What is the Molar concentration of Potassium ions in this diluted solution?
April 11, 2013 by Jo

Chemistry
Calculate the percent ionization of 0.140 M lactic acid in a solution containing 8.5×10−3 M sodium lactate.
April 27, 2013 by John

Chemistry
A solution is made by containing 15 mL of 17.5 M acetic acid with 5.52 g of sodium acetate and diluting to total volume of 1.50 L. Calculate the pH
March 23, 2015 by Gabby

chemistry
A solution is made by containing 15 mL of 17.5 M acetic acid with 5.52 g of sodium acetate and diluting to total volume of 1.50 L. Calculate the pH
March 23, 2015 by Gabby

College Chemistry
A student weighs out 0.568 g of KHP (molar mass=204g/mol) and titrates to the equivalence point with (36.78 cm cubed which is 3) of a stock NaOH solution. What is concentration of stock NaOH solution? KHP is an acid with one acidic proton. The word cubed is in word form ...
October 22, 2010 by Elleni

Chemistry
HA and HB are both weak acids although HB is the stronger of the two. Will it take a larger volume of a 0.10 M NaOH solution to neutralize 50.0 mL of 0.10 M HB than would be needed to neutralize 50.0 mL of 0.10 M HA?
March 10, 2011 by sovanna

SUPER URGENT-- CHEMISTRY
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 much carbon dioxide if at stp? 3. ...
May 21, 2012 by Danny

Chemistry
Sorry about that The chemical 5-amino-2,3-dihydro-1,4-phthalazinedione, better known as luminol, is used by forensic scientists in analyzing crime scenes for the presence of washed-away blood. Luminol is so sensitive that it can detect blood that has been diluted 10,000 times...
February 11, 2009 by HELP PLEASEEE

chemistry
No precipitate formed when an aqueous solution of NaCl or Na2SO4 was added to the sample solution. A precipitate formed when the sample solution was made basic with NaOH. Which ion(s) are present in the sample soluiton? [Hg2]2+ [Ba]2+ [Mn]2+ I know that all three are not, but ...
October 8, 2007 by Christie

Math
A chemistry teacher needs 2.5 liters of a sulfuric acid solution that is 20% sulfuric acid and 80% water . He has 2 liters of a 15% sulfuric acid solutionleft over from earlier laboratory exercises. He also has 44 liters of a 50% solution. Let x represent the number of liters ...
May 31, 2011 by Paul

Chemistry III
Assume you dissolve 0.240 g of the weak acid benzoic acid, C6H5CO2H, in enough water to make 1.16 102 mL of solution and then titrate the solution with 0.153 M NaOH. C6H5CO2H(aq) + OH -(aq) C6H5CO2-(aq) + H2O(l) (a) What was the pH of the original benzoic acid solution? (b) ...
March 27, 2012 by Kelly

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