Question

For the reaction $C_2{H}_{5}OH+B{r}^{-}\leftrightharpoons C_2{H}_{5}Br+O{H}^{-}$, equilibrium will shift to the right on:

• A. exposing the system to light
• B. adding an alkali
• C. adding an acid
• D. adding $C_2{H}_{5}Br$

Answer 1

The correct option is C adding an acid

When an acid is added, the hydrogen ions from acid react with hydroxide ions to form water. Due to this, the hydroxide ion concentration decreases.

The equilibrium will shift towards the right so that more hydroxide ions are produced, which will nullify the effect of the decrease in the hydroxide ion concentration.