Simple Concentration Q

  • Thread starter Jimbo57
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  • #1
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Homework Statement


A saturated solution of SrSO4 has a [SO42-] 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?
 

Answers and Replies

  • #2
Borek
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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.
 
  • #3
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Thanks for the help Borek! Turns out they forgot to supply the ksp value.
 

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