This document contains 5 chemistry problems involving calculations of concentrations, volumes, and masses in acid-base reactions. The problems cover mixing solutions to calculate concentrations, determining the mass of base needed to neutralize an acid solution, calculating the volume of acid solution needed to neutralize a base solution, and using a titration experiment to determine the molecular weight of an unknown acid. All pertinent equations, calculations, and boxed final answers are shown.

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Section CN
Acids and Bases Probset Chem3 ~~k4~
Oct. 12/13, 201120pts
61rfC~
SHOW ALL PERTINENT EQUATIONS, CALCULATIONS AND SOLUTIONS. BOX YOUR FINAL ANSERS
1. Calculate the [Htjand [OH-] of a solution made by mixing 25.0mL of 0.200M HCl and 49.0mL of
0.100M NaOH.
2. How many grams of KOH is needed to neutralize 25.0mL of 0.10M Hel solution?
3. What volume in mL of 0.30M H2S04 solution is needed to neutralize 15mL of a 0.50 M NaOH
solution?
4. Calculate the [H+],pH, [OH-] and pOH ofa solution made by mixing 30.0mL 0.25M HI and 29.9mL
O.5M NaOH.
5. The titration of 0.2142 grams of unknown acid requires 32.7 mL ofO.l028M NaOH.Assuming
that the acid is monoprotic, calculate the molecular weight of the acid.

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