What happens to the basic strength (measured by degree of dissociation) of an aqueous solution of up — Ionic Equilibrium Chemistry Question

💡 Solution & Explanation

$NH_4OH$ is a weak base that dissociates as $NH_4OH \rightleftharpoons NH_4^+ + OH^-$. The addition of $NH_4Cl$ (a strong electrolyte) provides a large concentration of $NH_4^+$ ions. According to Le Chatelier's principle, this common ion shifts the equilibrium backward, suppressing the dissociation of $NH_4OH$ and thus decreasing its basic strength.