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