Homework Help: AP Chem

Posted by Anna on Monday, November 3, 2008 at 8:08pm.

An aqueous solution contains 4.50 g of calcium chloride, CaCl2, per liter. What is the molarity of CaCl2? When calcium chloride dissolves in water, the calcium ions, Ca^+2, and chloride ions, Cl^-, in the crystal go into the solution. What is the molar concentration of each ion in the solution?

I got .0450 M CaCl2. I'm pretty sure that is right, but I don't understand what it means by how to find the molarity of each ion.

AP Chem - Anna, Monday, November 3, 2008 at 8:10pm
Oh wait, is this one like the last one I asked for? I didn't work that one out yet.
AP Chem - DrBob222, Monday, November 3, 2008 at 8:16pm
Yes, the principle is the same.
- AP Chem - DrBob222, Monday, November 3, 2008 at 8:19pm
  But I obtained 4.50/110.983 = 0.04055 which I would round to 0.0406 M.
  - AP Chem - Anna, Monday, November 3, 2008 at 8:36pm
    I divided by 111.1. Our teacher likes us to use 3 digits when using atomic weight.
    - AP Chem - DrBob222, Monday, November 3, 2008 at 8:39pm
      OK, but 4.50/111 still isn't 0.0450. Perhaps you just made a typo.

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