The rate of reaction:
`CH_3C(S) NH_2(aq) + H_2O to H_2S (aq) + CH_3C(O)NH_2(aq)`
is given by the rate law:
Rate = `k[H_3O^+] [CH_3C(S) NH_2]`
Consider 1 litre of solution that is 0.20 M in `CH_3C(S)NH_2` and 0.15 M in HCl at `25^@C`.
(a) For each of the following changes, state whether the rate of reaction increases, decreases or remains the same.
(i) A 4 g sample of NaOH is added to the solution
(ii) 500 mL of water is added to the solution
(iii) The 0.15 M HCl solution is replaced by a 0.15 M acetic acid solution.
(b) State whether the value of k will increase, decrease or remain the same.
(i) A catalyst is added to the solution (ii) The reaction is carried out at `15^@C` instead of `25^@C`

Explanation

(i), (ii) and (iii) decreases (b) (i) increases (ii) decreases