Quick questions on Weak acids and Ka - TCE Chemistry (Tasmania)

2short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is the acid dissociation constant?

Show answer

A weak acid HA ionises only partly in water:

What is calculating the pH of a weak acid?

Show answer

Set up an equilibrium with the initial acid concentration. Let

x

be the concentration of

\text{H}^+

formed. Then

[\text{H}^+] = [\text{A}^-] = x

and

[\text{HA}] = c - x

. Because the acid is weak,

x

is small, so we approximate

c - x \approx c

Have a question we have not covered?

This dot-point answer is short enough that we have not extracted many short questions yet. Read the full dot-point answer or ask Mo, our study assistant, in the chat for follow ups.

All ChemistryQ&A pages