Author Question: A monoprotic weak acid when dissolved in water is 0.66% dissociated and produces a solution with a ... (Read 297 times)

craiczarry · **on:** Mar 21, 2021

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 K_aof 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 K_a 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.

alexisweber49 · **Reply #1 on:** Mar 21, 2021

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