Answer to Question #232211 in General Chemistry for Joy

Question

In separate test tubes, prepare 2mL of 0.2 M of the following buffer solutions by mixing volumes of 0.1 M salt and 0.1 M acid/base

Test tube Number

Buffer solution

Salt

Acid/Base

1

Acetate buffer

0.1 M CH₃COOH

0.1 M CH₃COOH

2

Phosphate buffer

0.1 M Na₂HPO₄

0.1 Na₂HPO₄

 

QUESTION:

The internal pH of a muscle is 6.8. Calculate the [H₂PO₄^-]/[HPO₄^2-] ratio in the cell. The second dissociation constant of phosphoric acid is 6.31x10^-8

Answer 1

[H2PO4-]/[HPO42-] ratio=0.4