Question

Дихромат калия массой 14,7г добавили к 84,8мл 36,5%-ной соляной кислоты (плотность 1,18г/мл), и раствор нагрели до окончания реакции. Определите массовые доли веществ в полученном растворе.

Answer 1

Решение в прикрепленном файле 

Answer 2

Calculation of Mass Fractions in the Solution

To determine the mass fractions of the substances in the solution, we need to calculate the masses of potassium dichromate (K2Cr2O7) and hydrochloric acid (HCl) in the solution.

Given: - Mass of potassium dichromate (K2Cr2O7) = 14.7 g - Volume of 36.5% hydrochloric acid (HCl) = 84.8 mL - Density of 36.5% hydrochloric acid (HCl) = 1.18 g/mL

To calculate the mass of potassium dichromate (K2Cr2O7), we need to convert the volume of hydrochloric acid (HCl) to mass using its density:

Mass of hydrochloric acid (HCl) = Volume of HCl x Density of HCl Mass of hydrochloric acid (HCl) = 84.8 mL x 1.18 g/mL

Let's calculate the mass of hydrochloric acid (HCl) first:

Mass of hydrochloric acid (HCl) = 84.8 mL x 1.18 g/mL = 100.144 g

Now, we can calculate the mass fraction of potassium dichromate (K2Cr2O7) in the solution:

Mass fraction of K2Cr2O7 = Mass of K2Cr2O7 / Total mass of the solution Mass fraction of K2Cr2O7 = 14.7 g / (14.7 g + 100.144 g)

Let's calculate the mass fraction of potassium dichromate (K2Cr2O7):

Mass fraction of K2Cr2O7 = 14.7 g / (14.7 g + 100.144 g)