Question

Sulfate in soil on Mars. A Barium Sulfate titration precipitation is described as follows. Initial concentration of Cl- before adding BaCl2 was 0.00019M in 25 mL of aqueous extract of Martian soil. At the end point, when there is a sudden rise in Ba2+, [Cl-] = 0.0096 M.

a) Write the titration reaction

b) How many mmol of BaCl2 were required to reach the end point?

c) How many mmol of (SO4)^2- were contained in the 25mL?

d) If (SO4)^2- is derived from 1.0g soil, what is the wt% of (SO4)^2- in the soil?

Answer 1