Agenda 4-2-12 and 4-3-12

AP Chemistry

Here's our practice buffer probelm:

The acid ionization constant, K_a, for propanoic acid, C₂H₅COOH, is 1.3x10^-5.

(a)   Calculate the hydrogen ion concentration, [H⁺], in a 0.20-molar solution of propanoic acid.

(b)   Calculate the percentage of propanoic acid molecules that are ionized in the solution in (a).

(c)   What is the ratio of the concentration of propanoate ion, C₂H₅COO^-, to that of propanoic acid in a buffer solution with a pH of 5.20?

(d)   In a 100.-milliliter sample of a different buffer solution, the propanoic acid concentration is 0.35-molar and the sodium propanoate concentration is 0.50-molar. To this buffer solution, 0.0040 mole of solid NaOH is added. Calculate the pH of the resulting solution.

Answer.

Chemistry 102/Accel

We worked on the titration part of the explorelearning.com site. Accel needs to finish whole packet by tomorrow. 102 needs to get to Activity B question 6.