How many moles Ca(OH)2 did you dissolve? That is 5.0g/molar mass Ca(OH)2.
M = moles/L soln. L = 2.
There is 1 Ca ion in a molecule of Ca(OH)2 and 2 OH ion in a molecule of Ca(OH)2 so the M of the Ca^2+ is the same as the M of the Ca(OH)2 but M OH^- is twice that of Ca(OH)2.
You dissolve 5 g of calcium hydroxide in 2 liters of water. What is the molarity of the hydroxide ions in this solution? What is the molarity of the calcium ions in this solution?
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