IOM 2018, Блиц, английски — Задача 71

OLYMPIAD OF METROPOLISES. Moscow, September 3 · 3 септември 2018 г.

Условие

A solution of hydrochloric acid is added to 10 mL of a 0.2 M solution of sodium aluminate. The amount of precipitate produced when 10 mL of the $HCl$ solution is added is equal to the amount of the precipitate when 20 mL of the $HCl$ solution is added. What is the molar concentration (in M) of the $HCl$ solution? Give the answer with 2 digits after decimal point and without units. Assume that only $Al(OH)_3$ precipitates.

Отговори

Решение

---

Оригинал в Архива: blitz.pdf · официални решения: blitz-answers.pdf