Solid Na 2 SO 4 is slowly added to a solution which is 0.02… | CGP Edu

Chemistry Ionic Equilibrium NTA Abhiyas Question Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

Solid Na 2 SO 4 is slowly added to a solution which is 0.020 M in Ba(NO 3 ) 2 and 0.020 M in Pb(NO 3 ) 2 . Assume that there is no increase in volume on adding Na2SO 4 . There preferential precipitation takes place. What is the concentration of Ba 2+ when PbSO 4 starts to precipitate? [K sp (BaSO 4 ) = 1.0 x 10 -10 and K sp (PbSO 4 ) = 1.6 x 10 -8 ]

A

5.0 x 10 -9 M

B

8.0 x 10 - 7 M

C

1.25 x 10 -4 M

D

1.95 x 10 - 8 M

Text Solution

Verified by Experts

The correct answer is:

1.25 x 10 -4 M

When BaSO 4 begins to precipitate

When PbSO 4 begins to precipitate

= 8.0 x 10 -7 M

is less for BaSO 4 precipitation so BaSO 4 precipitates first when PbSO 4 begins to precipitate = 8.0 x 10 -7 M at that point

concentration of

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