Answer to Question #171190 in Chemistry for Marvis

Question

A 0.2025 Sample consisting of only Bacl2 and Kcl required 20.25ml of 0.1200M Agno3 solution for the quantitative precipitation of chloride. Calculate the %Ba and %K in the sample.

Answer 1

2AgNO₃ + BaCl₂ = 2AgCl + Ba(NO₃)₂

C_M = n/V

n = C_M x V

n (AgNO₃) = 0.1200 x 0.02025 = 0.00243 mol

n (BaCl₂) = 1/2 x n (AgNO₃) = 0.00243/2 = 0.001215 mol

n = m/M

M (BaCl₂) = 208.23 g/mol

m (BaCl₂) = n x M = 0.001215 x 208.23 = 0.25 g

The mass of BaCl₂ in the sample is 0.25 g. Mass of the sample is required to calculate the %Ba and %K in the sample.