Question 1
A 4.5 x 10–3M solution of a weak acid is 6.3% dissociated at 25ºC. In a 4.5 x 10–4M solution, the percentage of dissociation would be:
◦
the same.◦
> 6.3%.◦
< 6.3%.◦
zero.◦
Need to know the Kaof the acid to answer this.Question 2
A monoprotic weak acid when dissolved in water is 0.66% dissociated and produces a solution with a pH of 4.15. Calculate the Ka of the acid.
◦
6.6 × 10–3◦
1.1 × 10–2◦
4.7 × 10–7◦
Need to know the initial concentration of the acid.◦
None of these are correct.