Question

Which is/are correct statements:

(i) In any strong acid’s solution, the concentration of [OH–] will be zero.

(ii) If DG⁰ of a reaction is positive, then the reaction will not proceed at all, in the forward direction for any concentrations of reactants and products.

(iii) Titration curves are drawn for (about the figure shown)

(1) 1M HCl (50 mL) with 1 M NaOH and

(2) 0.01 M HCl (50 mL) with 0.01 M NaOH on the same graph paper they look like:

• A. i & ii
• B. iii only
• C. ii only
• D. i & iii

Answer 1

Answer: (B)

iii only

Answer 2

(i) False, [OH–] = $\frac{10^{- 14}}{\lbrack H^{+}\rbrack}$ at 25⁰C

= $\frac{K_{w}}{\lbrack H^{+}\rbrack}$at any other temperature

(ii) False, DG⁰ = 0 = – RT ln Keq

so, Keq = 1

Hence reaction will proceed significantly in the forward direction.