Question

Определить pH 0,01 М раствора HCN, если константа диссоциации равна 7.9*10^-10

Answer 1

PH=5.55
решение на фото

Answer 2

Determining the pH of a 0.01 M HCN Solution

To determine the pH of a 0.01 M solution of HCN (hydrogen cyanide), we can use the dissociation constant (Ka) of HCN, which is given as 7.9 * 10^(-10) [[1]](https://uchi.ru/otvety/questions/opredelit-ph-001-m-rastvora-hcn-esli-konstanta-dissotsiatsii-ravna-7-9-10-10).

HCN is a weak acid that partially dissociates in water, forming H+ ions and CN- ions. The dissociation reaction can be represented as follows:

HCN ⇌ H+ + CN-

The dissociation constant (Ka) is defined as the ratio of the concentration of the products (H+ and CN-) to the concentration of the undissociated acid (HCN). In this case, the Ka value is given as 7.9 * 10^(-10).

To determine the pH of the solution, we need to calculate the concentration