Quick questions on Conjugate acid-base pairs (Ka, Kb, Kw relationship) explained: HSC Chemistry Module 6

5short 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 salt hydrolysis?

Show answer

A salt is named by its cation and anion. Each ion comes from an acid or a base.

What is calculating the pH of a salt solution?

Show answer

For a salt of a strong base and a weak acid (say, sodium ethanoate at concentration

c

What is q1?

Show answer

State the relationship between

K_a

K_b

and

K_w

for a conjugate acid-base pair, and explain in words what the relationship implies. [3 marks]

What is q2?

Show answer

The

K_a

of formic acid (HCOOH) is

1.8 \times 10^{-4}

. Calculate

K_b

for the formate ion (

HCOO^-

) and state the pH of a 0.10 mol L

^{-1}

sodium formate solution. [3 marks]

What is q3?

Show answer

Predict whether each of the following salt solutions is acidic, basic or neutral and justify with the conjugate-pair analysis: (a)

NaCl

, (b)

NH_4NO_3

, (c)

Na_2CO_3

. [2+2+2 marks]

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