Medium Practice — Set 1

Quick Recap — Equilibrium & pH Calculations

• $K_p=K_c(RT)^{\Delta n_g}$; $K_{reverse}=1/K$.
• Strong acid/base: $pH=-\log C$ (or $pOH=-\log C$). Weak acid: $[H^+]=\sqrt{K_a C}$, $\alpha=\sqrt{K_a/C}$ (Ostwald).
• $K_{sp}$: $AB\to s^2$; $AB_2$ or $A_2B\to4s^3$; $AB_3\to27s^4$.
• Salt hydrolysis: weak-acid salt $\to$ basic; weak-base salt $\to$ acidic.