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Homework Help: Concentration of sulphate ion

  1. Sep 13, 2012 #1
    1. The problem statement, all variables and given/known data
    The concentration of Al3+ ion in aqueous solution of Al2(SO4)3 is 0.28M, Then the concentration of SO42- ion in this solution will be?

    2. Relevant equations
    Al2(SO4)3 → 2Al3+ + 3SO42-

    3. The attempt at a solution
    What should i compare to start of with?
  2. jcsd
  3. Sep 14, 2012 #2


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    Gold Member

    How many moles of sulphate ions are present in 1 mole Aluminium Sulphate?
  4. Sep 14, 2012 #3
    3 moles, is this the answer?
  5. Sep 14, 2012 #4
    How many moles of Aluminium Sulphate do you currently have?
  6. Sep 14, 2012 #5
    1 mole
  7. Sep 14, 2012 #6


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    Staff: Mentor

    Take a look at the formula - how many moles of Al3+ and how many moles of SO42- in 1 mole of Al2(SO4)2? What is their ratio? Can you use this ratio to solve the problem?
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