1. Tardigrade
  2. Question
  3. Chemistry
  4. 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 ?

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Q. Consider following reactions,
(I) $HI+ OH^- \rightleftharpoons H _{2} O +I^{-}$
(II) $HCO _{3}^{-}+ Br ^{-} \rightleftharpoons HBr + CO _{3}^{2-}$
(III) $O ^{2-}+ H _{2} O \rightleftharpoons 2 OH^{-}$
(IV) $HF + H _{2} O \rightleftharpoons H _{3} O ^{+}+ F ^{-}$
In which of the above reactions, $\Delta G^{\circ}<\,0 $ ?

Equilibrium

Solution:

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, $\Delta G^{\circ}<\,0$. $O ^{2-}$ is a stronger base than $OH^-$. Thus, above reaction (III) is favoured $\Delta G^{\circ}<\,0$