An experiment was performed to determine the solubility and the solubility product constant of gallic acid, a monoprotic organic acid (gmm=170.12). The equilibrium involved is: C6H5O3COOH(s) <-----> C6H5O3COO-(aq) + H+(aq)

Titrations using 1.14x10^-1M NaOH were performed.

Determination 1 2 3

Temp of solution, C 20.2 20.4 20.1

Vol of acid solution titrated, mL 25.00 22.00 20.10

Vol of NaOH solutions used, mL 14.61 13.02 11.73

Calculate the following:

1. number of moles of NaOH used

2. number of moles of H+ titrated

3. [H+] in acid solution

4. [C6H5O3COO-] in acid solution

5. Ksp

6. Solubility of acid in g per 100mL