Question

An experiment was performed to determine the solubility and the solubility product constant of gallic acid, a monoprotic organic (gmm = 170.12). The equilibrium involved is C6H5O3COOH(s) ------C6H5O3COO-(aq) + H+(aq) Titrations using 1.14 x 10^-1M NaOH were performed, and the following data was obtained Determinations 1, 2, 3 temperature of solution 20.2 20.4 20.1 volume of acid solution titrated, mL 25.00 22.00 20.10 volume of NaOH solution, mL 14.61 13.02 11.73 Calculate: number of moles of NaOH used _____ _____ ______ number of moles of H+ titrated _____ _____ ______ [H+} in acid solutin _____ _____ ______ Ksp _____ _____ ______ average Ksp ____ solubility of acide in g per 100 mL _____ chemistry handbook value for solubility at 20 degrees 1.15 per 100 mL

Answer 1

An experiment was performed to determine the solubility and the solubility product constant of gallic acid, a monoprotic organic (gmm = 170.12).

The equilibrium involved is

C₆H₅O₃COOH_(s) ------C₆H₅O₃COO^-_(aq) + H⁺_(aq)

Titrations using 1.14 x 10^-1M NaOH were performed,

Determination	Temperature of solution	Volume of acid solution titrated	Volume of NaOH solution
1	20.2	25.00 mL	14.61 mL
2	20.4	22.00 mL	13.02 mL
3	20.1	20.10 mL	11.73 mL

Calculate:

Number of moles of NaOH used _____ _____ ______

Number of moles of H+ titrated _____ _____ ______

[H+] in acid solutin _____ _____ ______

Ksp _____ _____ ______

Average Ksp ____

Solubility of acide in g per 100 mL _____

chemistry handbook value for solubility at 20 degrees 1.15 per 100 mL

Number of moles of NaOH used:

Determination 1

Determination 2

Determination 3

Number of moles of H+ titrated:

Determination 1

Determination 2

Determination 3

[H+] in acid solution

Determination 1

Determination 2

Determination 3

Ksp

Determination 1

Determination 2

Determination 3

Average Ksp

Solubility of acid in g per 100 mL

1) The molar solubility of C₆H₅O₃COOH_(s)

C₆H₅O₃COOH_(s) ------C₆H₅O₃COO^-_(aq) + H⁺_(aq)

You want to know the solubility on acid in g per 100 ml:

in 100ml: