Help with Chemistry Problems (Titration, Buffers, pH?)?

Posted on 2016-02-20 13:58:00 in Chemistry by CHRISTINA

Here are three things/concepts I need help solving. 

1)A solution of 0.348 M KOH is used to titrate 16.5 mL of a 0.178 M H3PO4 solution. What volume, in milliliters, of the KOH solution is required? 

H3PO4(aq)+3KOH(aq)→3H2O(l)+K3PO4(aq) 

2) Which of the follow are buffers? 
HCOOH and HCOOK 
HF and KCl 
HCl and KCl 
NaF and KF 
NaCl and NaOH 
NaCl and KCl 
HCN and KCN 

3) A solution of hydrochloric acid is mixed with an equal volume solution of barium hydroxide. When pH paper is inserted into the resulting solution, the pH was determined to be 7.0. If the initial concentration of the hydrochloric acid solution was 0.5 M, what is the concentration of the barium hydroxide solution? (options are 0.5M, 1.5M, 1.0M, 0.25M)

4. A 1.0 M solution of hydrochloric acid is mixed with an equal volume of sodium hydroxide solution. The resulting solution turns pH paper blue, meaning the solution is basic. Which of the following concentrations would be consistent with the experimental results for sodium hydroxide? (options are 0.5M, 0.25M, 2.0M, and 1,0M)

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