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Topic: ion concentrations calculation  (Read 3831 times)

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Offline kimi85

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ion concentrations calculation
« on: August 31, 2007, 12:56:11 PM »
How many milligrams of MgI2 must be added to 250 ml of 0.0876 M KI to produce a solution  with [I-] = 0.1000 M?

I can't get the right answer.

The correct answer is 430 mg.

Thank you.
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Offline enahs

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Re: ion concentrations calculation
« Reply #1 on: August 31, 2007, 01:05:25 PM »
How much I- is in the solution to begin with?
How much do you have to add to the solution to get the desired amount?


Remember MgI2 gives you 2 I- for each mol of MgI2.
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