What is the Correct Concentration of Sr2+ in a Saturated SrSO4 Solution?

[Jimbo57]

Homework Statement

A saturated solution of SrSO₄ has a [SO₄^2-] of 1.0x10^-4M. What is the [Sr²⁺]?

A. 3.4x10^-3M
B. 5.8x10^-4M
C. 1.0x10^-4M
D. 3.4x10^-7M

Homework Equations

The Attempt at a Solution

It's a multiple choice practice test and the answer key tells me that A is the answer. When I look at the question, the strontium and sulphate have a 1:1 molar ratio so wouldn't the answer be C? Is this a mistake or am I missing something?

 

[Borek]

Saturated solution doesn't have to be produced by putting SrSO₄ in water, it can be produced by other means (like dropping some SrSO₄ into sulfuirc acid). Then concentration of Sr²⁺ needs to be calculated from Ksp. I guess you were given Ksp somewhere else. But I agree question is ambiguous.

 

[Jimbo57]

Thanks for the help Borek! Turns out they forgot to supply the ksp value.