(a) Calculate the pH of a solution obtained by mixing 50.00 mL of 0.20 M weak acid HA ($\mathrm{K}_{\mathrm{a}}=10^{-5}$) and 50.00 mL of 0.20 M NaOH at room temperature.(b) One mole of a salt of type MX is dissolved in 1.00 kg of water. The freezing point of the solution is $-2.4^{\circ} \mathrm{C}$. Calculate the percent dissociation of the salt in water.
Answer
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