Consider following reactions, (I) HI+ OH- leftharpoons H 2 O +I- (II) HCO 3-+ Br - leftharpoons HBr + CO 32- (III) O 2-+ H 2 O leftharpoons 2 OH- (IV) HF + H 2 O leftharpoons H 3 O ++ F - In which of the above reactions, Δ G°

Question

Consider following reactions, (I) HI+ OH- leftharpoons H 2 O +I- (II) HCO 3-+ Br - leftharpoons HBr + CO 32- (III) O 2-+ H 2 O leftharpoons 2 OH- (IV) HF + H 2 O leftharpoons H 3 O ++ F - In which of the above reactions, Δ G°< 0 ? (A) II, III and IV (B) II and IV (C) I, II and III (D) I and III

Tardigrade Admin · Accepted Answer

A Bronsted-Lowry acid-base reaction is always favoured in the direction from the stronger to the weaker acid/base combination. Then, (I) is feasible. For such case, Δ G°< 0. O 2- is a stronger base than OH-. Thus, above reaction (III) is favoured Δ G°< 0

Q. Consider following reactions,
(I) $H I + O H^{-} ⇌ H_{2} O + I^{-}$
(II) $H C O_{3}^{-} + B r^{-} ⇌ H B r + C O_{3}^{2 -}$
(III) $O^{2 -} + H_{2} O ⇌ 2 O H^{-}$
(IV) $H F + H_{2} O ⇌ H_{3} O^{+} + F^{-}$
In which of the above reactions, $Δ G^{\circ} < 0$ ?

II, III and IV

II and IV

I, II and III

I and III

A Bronsted-Lowry acid-base reaction is always favoured in the direction from the stronger to the weaker acid/base combination. Then, (I) is feasible. For such case, $Δ G^{\circ} < 0$ . $O^{2 -}$ is a stronger base than $O H^{-}$ . Thus, above reaction (III) is favoured $Δ G^{\circ} < 0$

Q. Consider following reactions, (I) HI+OH−⇌H2​O+I− (II) HCO3−​+Br−⇌HBr+CO32−​ (III) O2−+H2​O⇌2OH− (IV) HF+H2​O⇌H3​O++F− In which of the above reactions, ΔG∘<0 ?