A student is given a solution containing 1.08 g of an unknown diprotic acid, . To determine the molar mass of the acid, the student titrates the sample using a solution of . The balanced equation for the reaction is shown below. 35.5 mL of are required to

Добавлена: 02.05.2026
Обновлена: 02.05.2026
Предмет: Химия
Автор: Кэмп

#Аналитическая химия
#Экспериментальные методы в химии

A student is given a solution containing 1.08 g of an unknown diprotic acid, . To determine the molar mass of the acid, the student titrates the sample using a solution of . The balanced equation for the reaction is shown below. 35.5 mL of are required to

Условие:

A student is given a solution containing 1.08 g of an unknown diprotic acid, $\mathrm{H}_{2} \mathrm{~A}$ . To determine the molar mass of the acid, the student titrates the sample using a $0.524 M$ solution of $\mathrm{KOH}(\mathrm{aq})$ . The balanced equation for the reaction is shown below.

\mathrm{H}_{2} \mathrm{~A}(a q)+2 \mathrm{KOH}(a q) \rightarrow 2 \mathrm{H}_{2} \mathrm{O}(l)+\mathrm{K}_{2} \mathrm{~A}(a q)

\nIf 35.5 mL of

\mathrm{KOH}(a q)

are required to consume the acid completely, what is the molar mass of the unknown acid?

Решение:

Шаг 1. Определим количество молей KOH. Объем раствора KOH равен 35,5 мл, что в литрах равно 0,0355 л. Концентрация KOH равна 0,524 M. Число молей KOH вычисляем по формуле:
n(KOH) = M × V = 0,524 моль/л × 0,0355 л...