## Chemistry 10th Edition

a) $Na_2SO_4$: Strong base $(NaOH)$ and weak acid $(HS{O_4}^-)$: Basic solution. b) $NH_4Cl$: Weak base $(NH_3)$ and strong acid $(HCl)$: Acidic solution. c) $KCl$: Strong base $(KOH)$ and strong acid $(HCl)$: Neutral solution. d) $NH_4CN$: Weak base $(NH_3)$ and weak acid: $(HCN)$: We need to compare the constants values: $K_b (NH_3) > K_a ( HCN)$: Therefore: Basic solution.