A 0.9182 g sample of CaBr2 is dissolved in enough water to give 500 ml of solution. what is the calcium ion concentration in this solution

Question

Casey Roach

Chemistry

30 May, 12:46

A 0.9182 g sample of CaBr2 is dissolved in enough water to give 500 ml of solution. what is the calcium ion concentration in this solution

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Isabel · Answer 1

First calculate the number of moles of CaBr2 given the molar mass of 199.89 g/mol.

moles CaBr2 = 0.9182 g / (199.89 g / mol) = 4.60 x 10^-3 mol

We see that each CaBr2 contains only 1 mole of Ca, so the moles of Ca is also:

moles Ca + = 4.60 x 10^-3 mol

So the molarity of this is:

Molarity Ca + = 4.60 x 10^-3 mol / 0.500 L

Molarity Ca + = 9.19 x 10^-3 M