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Molarity of chemical solutions

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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.
 

Answers and Replies

  • #2
chemisttree
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Write out the definition of molarity and go from there.
 

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