Thursday
March 23, 2017

Number of results: 46,286

Chemistry
Calculate the pH of a solution prepared by diluting 0.0015L of a 0.100 mol/L nitric acid solution with 0.5L of water. *C1×V1=C2×V2 C2=0.3MOL/L Do we use this concentration to find the pH
January 11, 2015 by Fayza

chemistry
if the average concentration of PCBs in the body tissue of a human is 4.0 ppm, what mass of the PCB is present in a 64 kg person? is this a significant amount in regards to the health of the person? What is the concentration of a solution of sodium nitrate that contains 35.0 g...
January 11, 2015 by Anonymous

chemistry
if the average concentration of PCBs in the body tissue of a human is 4.0 ppm, what mass of the PCB is present in a 64 kg person? is this a significant amount in regards to the health of the person? What is the concentration of a solution of sodium nitrate that contains 35.0 g...
January 11, 2015 by Anonymous

Chemistry
The pH of a solution is 1. Which of the following statements are also true for the solution? (Select all that apply.) It will change the color of red litmus to blue. The concentration of hydronium ion is equal to the concentration of hydroxide ion. The solution is acidic. It ...
May 18, 2012 by Cody

Chemistry
Enough of a monoprotic acid is dissolved in water to produce a 0.0195 M solution. The pH of the resulting solution is 6.24. Calculate the Ka for the acid. Also, the answer is not 1.7 * 10 ^ -11 The response is: You treated the initial concentration as 0. In this case, the ...
April 22, 2012 by chem1

Chemistry
I have a question about buffers. Part A So it starts with 20ml 0.1 sodium acetate and 25ml 0.1 acetic acid. Calculate ph of buffer is 4.74 because the acid and conjugate base have the same molarity correct? So the Ph is just pKa (1.8e-5)? Part B So the next part is add 5ml of ...
March 31, 2010 by Rio

chemistry
What is the concentration (in molarity) of acetone in a solution prepared by mixing 11 mL of 4.0 M acetone, 16 mL of 0.02 M Br2, 11 mL of 1.0 M HCl, and 16 mL of water?
September 16, 2010 by elizabeth

chemistry
A saturated solution of NaCl (dissolved in water) has a concentration of 4.01 M at a given temperature. The solution has a volume of 1 L (1000 mL). If the water were to evaporate until the volume of the solution is 500 mL (and then stirred), what would the concentration of the...
February 14, 2013 by Avi

chemistry
X is a solution,of dibasic of H2X. G is a solution containing 1.00g of NaOH in 250cm3 of solution . 24.60cm3 of solution F required 25.00cm3 of solution G . From your result and information provided above. (I)concentration of G in mol/dm3 (ii) concentration of F in mol/dm3 (...
May 25, 2014 by john kelechi

Chemistry
Solid AgNo3 is added slowly to solution of 0.001M Cl,Br,and I a) at what concentration of Ag will AgI precipitating? at what concentration of Ag will AgCl precipitating? at what concentration of Ag will AgBr precipitating? b) calculate the percent % of I ppt before reaching of...
October 18, 2016 by Ali

Chemistry
Solid AgNo3 is added slowly to solution of 0.001M Cl,Br,and I a) at what concentration of Ag will AgI precipitating? at what concentration of Ag will AgCl precipitating? at what concentration of Ag will AgBr precipitating? b) calculate the percent % of I ppt before reaching of...
October 18, 2016 by Ali

Science (Chemistry)
4. A Beer’s Law plot was prepared for the reaction A(aq) + B(aq) AB(aq), plotting absorption over AB(aq) concentration. The linear equation for this plot was y = 78.3x. A solution was prepared by mixing 10.0mL of 0.100M A with 5.00mL of 0.100M B and adding enough ...
June 16, 2014 by Niharika

chemistry
A STUDENT STUDYING THE FE+3- HSCN equilibrium put into a test tube 10.00ml of 2.00 x 10-3 M Fe(NO3)3 with 10.0 mL of 2.00 x 10-3 M HSCN.THE H+ in the resulting solution was manteined at 0.500.By spectrophotometric analysis of the equilibrium solution, the equilibrium ...
September 29, 2012 by Christina

chemistry
The pH of a solution prepared by mixing 45 mL of 0.183 M KOH and 65 mL of 0.145 M HCl is i solved it but my answer is wrong. the right one is 1.97. am i missing a step? moles of HCl left over = (moles of HCl) – ( moles of KOH) moles of HCl left over = (0.009425 mol) – ( 0....
November 23, 2010 by ben

chemistry
Calculate the pH at the equivalence point for the titration of a solution containing 1250.0 mg of hilariamine (MW = 92.5 g/mol, Kb = 8.1×10−4) with 0.1000 M HCl solution. The volume of the solution at the equivalence point is 175.0 mL. (I got the answer to be 12.0208 ...
May 15, 2011 by vivian

chemistry
Calculate the pH at the equivalence point for the titration of a solution containing 1250.0 mg of hilariamine (MW = 92.5 g/mol, Kb = 8.1×10−4) with 0.1000 M HCl solution. The volume of the solution at the equivalence point is 175.0 mL. (I got the answer to be 12.0208 ...
May 15, 2011 by vivian

chemistry
1)100ml sample of solution that is 0.2m in both Naf and Hf has 4.0 ml of 1.0m hcl added to it. calculate the ph change of this soultion .ka =7.2*10^-4 2)40 ml of 0.32m benzoic acid if titrated with 60 ml of 0.2 m naoh. clacilate the ph of the resulting solution at the ...
March 4, 2012 by Anonymous

chemsitry
1)100ml sample of solution that is 0.2M in both Naf and Hf has 4.0 ml of 1.0M hcl added to it. calculate the ph change of this soultion .ka =7.2*10^-4 2)40 ml of 0.32M benzoic acid if titrated with 60 ml of 0.2 M naoh. clacilate the ph of the resulting solution at the ...
March 4, 2012 by Anonymous

Please help. I have no idea how to do these 4 homework problems. 1- How many milliliters of 0.140 M HCl are needed to completely neutralize 42.0mL of 0.106 M Ba(OH)2 solution? 2-How many milliliters of 0.123 M H2SO4 are needed to neutralize 0.250 g of NaOH ? 3-If 55.2 mL of ...
February 22, 2010 by Robert

AP Chem
Hey guys! Stuck on some pH problems! Thanks so much in advanced: A) Calculate the pH of a 0.200 M solution of potassium acetate, KCH3CO2, in water at 25 °C. At this temperature, Ka = 1.76 × 10-5 for acetic acid. 1. 2.73 2. 5.45 3. 9.02 4. 9.94 5. 10.16 6. none of these Maybe...
October 10, 2015 by Allie

chem SCC 151
10.0 mL of HCl and a few drops of phenolphthalein indicator. The buret contains 0.110 M NaOH. What was the initial concentration of HCl?
July 15, 2012 by Anonymous

Chemistry
In this reaction solid NaOH is added to approximately 100 mL of 0.500 mol/L HCl. Trial 1: 2.02 g of solid NaOH is added to 102.0 mL of the HCl solution. The temperature goes from 22.00°C to 32.0°C. Calculate the heat evolved in each trial (Q). I'm confused on how to ...
August 4, 2015 by Emily

chemistry
The pKb values for the dibasic base B are pKb1 = 2.1 and pKb2 = 7.4. Calculate the pH at each of the following points in the titration of 50.0 mL of a 0.75 M B(aq) with 0.75 M HCl(aq). (b) after addition of 25.0 mL of HCl (c) after addition of 50.0 mL of HCl (d) after addition...
April 4, 2013 by Ashley

chemistry
What will be the final pH value if you mix 50ml HCl (aqueous solution, pH=0.5) and 40ml NaOH (aqueous solution, pH=12). Hint: convert pH value to concentration of acids/base, then consider the neutralization reaction, then find out the resulting pH value. Please show me your ...
April 4, 2013 by Anonymous

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

Chemistry105
1. (a) What is the molarity of a solution prepared by dissolving 4.315 g of NaOH in water to exactly 100 mL in a graduated flask? (Na = 23.0; O = 16.0' H = 1.0 amu).    (b) What volume of the above solution is required to neutralize exactly 25.00 mL of 0.1500 M HCl ...
December 4, 2012 by Mira

chemistry
A chemist needs a HCl solution with a molarity of less than 0.400 M for an experiment. To find out if a sample of HCl solution can be used in the lab, the chemist performs a titration to neutralize 59.2 mL of the HCl with 45 mL of 0.400 M NaOH. Based on the results, will the ...
January 31, 2014 by Matthew

Chemistry
Suppose that 18.84 mL of 0.315 M Ca(OH)2 is required to neutralize 18.2 mL of aqueous HCl solution. What is the molarity of the HCl solution? All help is appreciated. Would also like help showing which numbers go where within any equations! Thanks so much!
April 15, 2015 by Radio Active Wear

chem
Osmolarity (Osm) is the molar concentration of the particles-molecules and/or ions-in a solution. In physiological solutions, 5 \% ({\rm m/v}) glucose ({\rm C}_{6}{\rm H}_{12}{\rm O}_{6}) and 0.9 \% ({\rm m/v}) {\rm NaCl}, the osmolarity must be the same as for the blood, ...
April 11, 2011 by Anonymous777

chem
Osmolarity (Osm) is the molar concentration of the particles-molecules and/or ions-in a solution. In physiological solutions, 5 \% ({\rm m/v}) glucose ({\rm C}_{6}{\rm H}_{12}{\rm O}_{6}) and 0.9 \% ({\rm m/v}) {\rm NaCl}, the osmolarity must be the same as for the blood, ...
April 11, 2011 by Anonymous100

chemistry
For the titration of 50.00 mL of 0.1000 M ammonia with 0.1000 M HCl, calculate the pH (a) before the addition of any HCl solution, (b) after 20.00 mL of the acid has been added, (c) after half of the NH3 has been neutralized, and (d) at the equivalence point.
April 11, 2012 by chamy

Chemistry
A 10.00-mL sample of 0.1000 M KH2PO4 was titrated with 0.1000 M HCl Ka for phosphoric acid (H3PO4): Ka1= 7.50x10-3 ; Ka2=6.20x10-8 ; Ka3= 4.20x10-10 Calculate the pH after addition of 10.00 mL of HCl to the KH2PO4 solution?
August 7, 2014 by Jesus

AP CHEMISTRY
An experiment was carried out to determine the value of the equilibrium constant Kc for the reaction. Total moles of Ag+ present = 3.6 x 10-3 moles Total moles of NH3 present = 6.9 x 10-3 moles Measured concentration of Ag(NH3)2+ at equilibrium= 3.4* 10-2 M Total solution ...
March 12, 2012 by Jamba

Chemistry 1
A dilute solution of hydrochloric acid with a mass of 614.86 g and containing 0.33004 mol of HCl was exactly neutralized in a calorimeter by the sodium hydroxide in 619.41 g of a comparably dilute solution. The temperature increased from 15.529 to 19.691°C. The specific heat ...
July 1, 2014 by Sarah

Chemistry
You have an unlimited amount of 12M HCl stock solution. You need to neutralize 2.00 grams of NaOH by slowly adding 0.100M HCl solution. How will you prepare the proper amount of hydrochloric acid solution to add to the beaker of sodium hydroxide using a 500 ml volumetric flask.
November 25, 2011 by Shelby

HCl - Chem
Assume you had a very magnified view of a solution of HCl that allowed you to "see" the HCl. Draw this magnified view. If you dropped in a piece of magnesium, the magnesium would disappear and hydrogen gas would be released. Draw this out using symbols to represent the ...
January 13, 2007 by Gil

chemistry
these is 0.1M HCl of 100ml of that solution in a beaker,calculate pH?
February 12, 2011 by kabelo

Chemistry
Calculate the pH after 0.14 mole of NaOH is added to 1.07 L of a solution that is 0.54 M HF and 1.15 M NaF, and calculate the pH after 0.28 mole of HCl is added to 1.07 L of the same solution of HF and NaF. 0.14 mole of NaOH 0.28 mole of HCl
March 13, 2013 by Margaret

chemistry
a. How many moles of NaOH are present in 89.6 mL of 0.714 M NaOH? 6.40E-2 b. How many moles of HCl are present in a 30.0 mL sample that is neutralized by the 89.6 mL of 0.714 M NaOH? 6.40E-2 c. What is the molar concentration of the HCl solution described in part b of this ...
February 29, 2012 by krystal

Chemistry
If a chemist titrates 120.0 mL of NaOH with a 5.0 M solution of HCl and requires 56.0 mL of the acid to reach the endpoint, what is the concentration of the NaOH?
February 17, 2012 by Anonymous

Chemistry
If a chemist titrates 120.0 mL of NaOH with a 5.0 M solution of HCl and requires 56.0 mL of the acid to reach the endpoint, what is the concentration of the NaOH?
February 17, 2012 by Spacy1996

chemistry
A 25.0 mL solution of HCl has been spilt. It took 21.8 mL of saturated 2.5 M NaOH to neutralise the acid. What was the molar concentration of the acid?
August 7, 2013 by sarah

difficult chemistry
Calculate the molarity of thiosulfate solution if 0.400mg of Kl03 required 100ml of the thiosulfate solution provided that excess kl and hcl were added. Who helps me
January 12, 2013 by Fai

Chemistry
Consider the titration of a 50.0 mL 0.500 M F- with 0.500 M HCl. The pKa of HF = 3.46 and the pKb of F- is 10.54. Calculate the pH at the following volumes of HCl added. 1. Vsa= 0.00 mL of 0.500 M HCl 2. Vsa= 25.0 mL of 0.500 M HCl 3. Vsa= 49.5 mL of 0.500 M HCl 4. Vsa= 50.0 ...
April 27, 2016 by Lily

Chemistry - titration lab
Hello. For my chemistry of solutions class, we had a titration lab where we titrated NaOH into an HCl + H2O mix. This was a preparatory titration for the next one consisting of the hydrolysis of ethyl acetate into acetic acid with H+ ions as a catalyst (in our case the HCl). ...
July 31, 2012 by Robertq

chemistry
25ml of a solution of na2c03 having a specific gravity of 1.25g ml required 32.9ml of a solution of hcl containing 109.5g of the acid per litre for complete neutralization. Calculate the volume of 0.84N heso4 that will be compltetly neutralized by 125g of na2c03 solution The ...
February 17, 2013 by Fai

Chemistry
Sorry DrBob, it's me again! Here's the info: Antacid Brand: Life Concentration of HCl: 0.1845 M Concentration of NaOH: 0.1482 M Trial 1: 1.Mass of Table: 1.2173g 2.Volume of HCl added: 75.0 mL 3.Milliomoles of HCl added:(0.1845M x 75.0mL= 13.84 mmoles 4.Volume of NaOH used: 17...
October 18, 2010 by Akhed-To DrBob222

chemistry
it is found that 23.8 ml of 1 x 10^-3 M Sr(OH)2 is required to titrate 10.0 ml of an HCl soln. A) what is the concentration of the HCl soln? B) what is the pH of the HCl soln?
May 18, 2010 by jared

difficult chemistry
100 Liters of air at STP is slowly bubbled through 200ml of 0.03N Ba(OH)2 solution. The Baco3 formed due to reaction is filtered and few drops of phenolphthalein is added to the solution rendering it pink. The solution required 25ml of 0.2N HCL solution when indicator turned ...
January 12, 2013 by Fai

Chemistry
you have75.0ml of 2.5 M Solution of Na2CrO4(aq). You also have 125ml of a 1.74M solution of AgNO3(aq)Calculate the concentration of NO3 when the two solutions are added together
February 27, 2011 by Logan

Chemistry
a solution is prepared by dissolving 50 g of calcium chloride in a 250ml volumetric flask which is then filled with distilled water up to the line-mark. Calculate the molar concentration of the solution.
April 5, 2014 by Huda

chemistry
A common way of producing hydrogen gas in the lab is by reacting zinc with hydrochloric acid. Zn (s) + 2 HCl (aq) -> ZnCl2 (aq) + H2 (g) A sample of impure zinc, of mass 5.10g, reacted with an excess of hydrochloric acid solution 3.0 mol dm-3 concentration. In the end 1.7dm...
November 17, 2016 by Lois

chemistry
Make up a 500mL solution of 4.8M solution HCl (HCl gmw= 36.5g)
September 9, 2012 by Dena

Chemistry
How can dilute a 1 M HCl solution to obtain 100 mL of HCl solution 0,1 M?
March 25, 2016 by Eliza

chemistry help
A solution of thiosulfate ions has been prepared by dissolving 4.5g of Na2S2O3.5H2O in 250 ml of solution. Calculate the concentration of the thiosulfate ions S2O3^2- in the solution
January 17, 2016 by vicky

chem2
A small piece of zinc is dissolved in 22.29 mL of 0.968 M HCl. Zn (s) + 2 HCl (aq) ----> ZnCl2 (aq) + H2 (g) At the end of the reaction, the concentration of the 22.29-mL sample is redetermined and found to be 0.691 M HCl. What must have been the mass of the piece of zinc ...
September 22, 2008 by fru

chemistry
the concentration of OH ions in a household ammonia cleaning solution is0.0035M. Calculate the concentration of H ions. would it be pH=-log (.0035)??? or Kc=1/.0035???
April 10, 2008 by david

Chemistry
OK I just need help with two final problems that I am stuck on: The problem states the calcium carbonate in limestone reacts with HCl to produce a calcium chloride solution and carbon dioxide gas CaCO3(s)+2HCl(aq)-->CaCl2(aq)+H2O(l)+CO2(g) 1)Find how many moles of CO2 form ...
December 9, 2010 by TT

Calculate the concentration of I- in an aqueous solution prepared in a 250 ml volumetric flask from 50.0 ml of a 0.840 mol/L aluminum iodide solution and 160.0 ml of a 0.500 mol/L tin(IV) iodide solution.
March 28, 2015 by Sim

CHEM
Calculate the equilibrium constant for the weak base CH3NH2, if a solution of the base with an initial concentration of 7.05×10-4 M has a [CH3NH3+] of 0.000379 M (make an exact calculation assuming that initial concentration is not equal to the equilibrium concentration). ...
April 26, 2009 by harry

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
Calculate the H3O+ ion concentration and the pH at the equivalence point when 45.0 mL of 0.4000 M NH3 is mixed with 45.0 mL of 0.4000 M HCl. Ka=5.6x10-10
April 21, 2013 by john

Chemistry
Calculate the H3O+ ion concentration and the pH at the equivalence point when 45.0 mL of 0.4000 M NH3 is mixed with 45.0 mL of 0.4000 M HCl. Ka=5.6x10-10
April 21, 2013 by john

Chemistry
you are given the equation S2O3 + 2H --> S + SO2 + H2O you mix 25 ml of HCl with a concentration of 2 mol/L with 5 mL of Na2S2O3 with a concentration of 0.3 mol/L. what is the concentration of S2O3 and H?
October 14, 2010 by Samantha

Chemistry
4 Questions on molarity that I really don't understand. I have the formulas, but they don't seem to fit in to the question right. Please take a look, thanks! 1. Calculate the weight, in grams, of HNO3 present in 1.0 litre of 0.10M of solution. 2. What is the concentration, in ...
October 25, 2015 by Bethany

Chemistry
A cell was constructed with two lead electrodes. The electrolyte compartment is 1 M Pb(NO3)2 (aq). In the other compartment, NaI has been added to a Pb(NO3)2 solution until a yellow precipitate forms and the concentration of I- ions is .5 M. The potential of the cell is .155 V...
February 28, 2014 by Anonymous

Chemistry
At 100 degrees C, pure H2O has a vapor pressure of 760 torr. An aqueous solution has a concentration of 1.90 M MgCl2. The van't Hoff factor is 2.45. The density of the solution is 1.09 g/mL. Calculate the vapor pressure of the solution.
May 24, 2016 by Ayaka

Calabasas HS
A 46.2-mL, 0.568 M calcium nitrate [Ca(NO3)2] solution is mixed with 80.5 mL of1.396 M calcium nitrate solution. calculate the concentration of the final solution
September 28, 2010 by Michael

chemistry
Calculate the equilibrium constant for the weak base C5H5N, if a solution of the base with an initial concentration of 5.74×10-3 M has a [C5H5NH+] of 0.00000283 M (make an approximate calculation assuming that initial concentration is equal to the equilibrium concentration). ...
October 10, 2013 by HELP ASAP PLEASE

chemistry
Calculate the hydronium ion concentration and pH in a 0.037 M solution of sodium formate, NaHCO2. hydronium ion concentration i don't understand these
March 6, 2013 by sara

Math
The pH of a solution ranges from 0 to 14. An acid has a pH less than 7. Pure water is neutral and has a pH of 7. The pH of a solution is given by pH = -logx where x represents the concentration of the hydrogen ions in the solution in moles per liter. Find the pH if the ...
January 6, 2017 by lili

chemistry
0.30M nh3 and 0.20M HCL calculate the ph of solution kb=1.8 × 10^-5
March 2, 2013 by kanks

science
Calculate the pH of the solution 5ml of M/5,HCl+10ml of M/10 NaO
August 12, 2016 by KANNAN

Chemistry
My brain refuses to wrap around titration. Problem: Given 150.0 mL of a 1.05 M HCl solution, how many milliliters of a 2.50 M Al(OH)3 solution are required to neutralize the HCl? I think the balanced formula is 3HCl + Al(OH)3 - AlCl +3H20 but that's as far as I get.
December 7, 2009 by Wolfmaid

chemistry
a solution (S) is prepared by dissolving 50.0 g calcium chloride in 250 ml volumetric flask wich is then filled with distilled water up to the line mark. calculate the molar concentration of solution (S)
March 10, 2013 by alia

Chemistry
a solution of OH- ions is added to a beaker of pure water at 25 C, to a final concentration of 872 nM. Calculate the pH of the solution. I know that pH=-log[H+], but I'm still really confused as to how to convert the nM to M and how to solve this problem.
September 5, 2014 by Kayla

chemistry
Ould you please offer me some insight to this, Calculate the hydrogen ion concentration (H+) for the aqueous solution in which (OH-) is1×10-15 mol/L. Is this solution acidic, basic or neutral? Thanks in advance
March 20, 2016 by lulu

Chemistry:Important!!!!!!!
20.00 mL of a H2SO4 solution with an unknown concentration was titrated to a phenolphthalein endpoint with 39.13 mL of a 0.1061 M NaOH solution. What is the concentration of the H2SO4 solution?
March 3, 2014 by Jackie

chemistry
A home swimming pool is disinfected by the daily addition of 0.50 gal (1 gal = 3.785 L) of a "chlorine" solution–NaOCl in NaOH(aq). To maintain the proper acidity in the pool, the NaOH(aq) in the "chlorine" solution must be neutralized. By experiment it is found that about ...
October 9, 2012 by joe

ap chemistry
Calculate the pH at the equivalence point for the titration of a solution containing 150.0 mg of ethylamine (C2H5NH2) with 0.1000 M HCl solution. The volume of the solution at the equivalence point is 250.0 mL. Kb for ethylamine is 4.7 × 10−4.
February 4, 2014 by gabriella

Chemistry
Determine how many mL of solution A (acetic acid-indicator solution) must be added to solution B (sodium acetate-indicator solution) to obtain a buffer solution that is equimolar in acetate and acetic acid. Solution A: 10.0 mL 3.0e-4M bromescol green solution 25.0mL 1.60M ...
October 29, 2012 by Jake

Chemistry
If 20.00 mL of 0.2019 M HCl requires 39.63 mL of a NaOH solution for complete neutralization, what is the concentration of the NaOH solutions? How many significant figures are justified in the answer?
October 29, 2008 by Lilit ***

Math
The pH of a solution ranges from 0 to 14. An acid has a pH less than 7. Pure water is neutral and has a pH of 7. The pH of a solution is given by pH = -logx where x represents the concentration of the hydrogen ions in the solution in moles per liter. Find the pH if the ...
May 23, 2016 by Liz

Chemistry
A volume of 45.3mL of .719 M Ca(NO3)2 solution is mixed with 82.3mL of 1.409M Ca(NO3)2 solution calculate the concentration of the final solution
October 10, 2010 by Jorge

Chemistry
Sorry DrBob, it's me again! Here's the info: Antacid Brand: Life Concentration of HCl: 0.1845 M Concentration of NaOH: 0.1482 M Trial 1: 1.Mass of Table: 1.2173g 2.Volume of HCl added: 75.0 mL 3.Milliomoles of HCl added:(0.1845M x 75.0mL= 13.84 mmoles 4.Volume of NaOH used: 17...
October 19, 2010 by Akhed-To DrBob222

Chemisty
Let's explore the efficiency of chloride ion precipitation in seperating Ag^+ from Pb^2+ in a solution. Suppose that [Pb^2+]= 0.045 mol/L and [Ag^+]= 0.084 mol/L. Calculate the chloride ion concentraion required to just start precipitation of Pb^2+ ion and then calculate the ...
March 4, 2012 by Tanner

Chemistry
A pH = 7.6 buffer is needed in the lab. This buffer is made by first dissolving 17.42 g K2HPO4 in 600 mL of water. What is the pH of this salt solution? This solution of course will be too basic becuase we only have the base of the buffer present. What must the value of the ...
March 12, 2015 by Carl

Chemistry
Chester makes 1L of a 0.01M HCl solution and measure the pH. Burt then adds 5.80 g of sodium chloride to Chester’s solution and measures the pH. Calculate the difference between the two pH values obtained.
February 14, 2014 by Anonymous

Chemistry
24.0 mL of a 2.4 M silver nitrate is mixed with 32.0 mL of 2.0 M sodium. Calculate the mass of precipitae formed. Calculate the concentration of all ions remaining in solution after the precipitate forms. I don't know how to start this or where to go with it...
April 7, 2015 by Marissa

Chemistry
A goal of the acid-base titration in this scenario is to determine the concentration of sodium hydroxide solution. To do this, a 1.3000 g sample of potassium hydrogen phthalate (KHC8H4O4) is massed out. The KHP has one acid proton (H+). The solid is dissolved in a beaker and 2...
September 26, 2015 by Seth

Chemistry
Phosphate standards used to generate the calibration curve are usually made by first preparing a stock solution of known concentration, then diluting it to the required concentration. First prepare a stock solution that is 1.00 x 10-2 M in phosphate ion. How many g of Na3PO4 ...
September 6, 2010 by Khaalid

chemistry
A lab tech had accidentally set out 16M HCl for this experiment. How much ( in mL) 16M HCl is needed to make 450mL of a 3M HCl solution?
October 7, 2013 by Christina

chemistry
A beaker contains 250.0 mL of a 1.00 M HCl solution. How many moles of the acid would remain in the solution after 0.199 moles of HCl are neutralized?
June 13, 2010 by Jerry

chemistry
A 5.309 g antacid tablet, with CaCO3 as the active ingredient, was mixed was 30.0 mL of 0.831 M HCl. After the reaction occurred, it took 15.3 mL of 0.7034 M NaOH to neutralize the excess acid. a) How much HCl (in mL) of was neutralized by NaOH? b) How much HCl (in mL) was ...
March 20, 2017 by Alex

College Chemistry
given the concentration of 125.0mg/L of Fe(2+)in the stock solution and the volume used which is (1.00mL) how do i calculate the concentration of iron(II) ions in mg/L? i pipet 1.00mL of the stock into a 250ml volumetric flask!
July 12, 2012 by Anonymous

chemistry
Calculate the [OCl-] of a 7.03×10-2 M solution of the weak acid HClO (make an approximate calculation assuming that initial concentration is equal to the equilibrium concentration). Round your answer to 3 significant digits. HClO = OCl- + H+
October 10, 2013 by HELP ASAP PLEASE

Chemistry
A solution of HCL whose pH=2.010 was added to neautralize a 40.00 ml solution of KOH, the molarity of KOH is .2567 M. How many mls of HCl were required?
October 10, 2011 by Anonymous

chemisty
NaOH + HCl -> NaCl + H2O What is the molarity of a NaOH solution that required 31.6mL to neutralize 25.0mL of a 0.145 M HCl solution?
December 5, 2012 by Jo

Chemistry
Some solid copper(II) sulfate is dissolved in sufficient water to make 100.0 mL of solution. Enough of a sodium hydroxide solution of concentration 0.1500 mol/L is added just to react with all of the first solution, with none left over. This turns out to be a volume of 47.08 ...
February 22, 2011 by OLGA

Science - chemistry
The SO2 present in air is mainly responsible for the phenomenon of acid rain. The concentration of SO2 can be determined by titration against a permanganate solution of known concentration as follows: SO2 + MnO4^-1 -> SO4^-2 + Mn2+ (unbalanced) Balance the equation showing ...
June 8, 2014 by Teagan

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