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Homework Help: Simple Concentration Q

  1. Oct 22, 2012 #1
    1. The problem statement, all variables and given/known data
    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

    2. Relevant equations

    3. 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?
  2. jcsd
  3. Oct 23, 2012 #2


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    Staff: Mentor

    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.
  4. Oct 24, 2012 #3
    Thanks for the help Borek! Turns out they forgot to supply the ksp value.
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