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Homework Help: Molarity of chemical solutions

  1. Oct 9, 2007 #1
    This is probably an incredibly easy one for you, but it's frying me. I'm in AP Chem, and since I'm involved in a lot (excuses, excuses...tsk tsk...), my brain is fried and it's having trouble clicking. My teacher is unhelpful, even hostile, and the book provides no explanations. For example:

    A 0.1025 gram sample of copper metal is dissolved in 35 mL of concentrated HNO(subscript 3) to form Cu+2 ions and then water is added to make a total volume of 200 mL. (Calculate the molarity of Cu+2.)

    Why isn't this clicking? Maybe a short answer and an explanation would be helpful.

    Also this:

    Calculate the concentration of all ions present in each of the following solutions of strong electrolytes:

    .1 mol of Ca(NO3)2 in 100 mL of solution


    1 g of K3PO4 in 250 mL of solution.

    Thank you for any help.
  2. jcsd
  3. Oct 10, 2007 #2


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    Science Advisor
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    Gold Member

    Write out the definition of molarity and go from there.
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