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April 16, 2014

Homework Help: Chemistry

Posted by Rodrigo on Saturday, January 23, 2010 at 12:17am.

Given these chemical reactions:

Ca^(2+)(aq) + 2IO3^(-)(aq) → Ca(IO3)2(s)

Ca(NO3)24H2O(s) → Ca^(2+)(aq) + 2NO3^(-)(aq) + 4H2O(l)

KIO3(s) → K^(+)(aq) + IO3(-)(aq)


Calculate the masses of Ca(NO3)24H2O(s) and KIO3(s) required to make 10 g of Ca(IO3)2(s). This is done by combining IO3^(-) with a slight excess of Ca^(2+) and allowing the first reaction above to proceed. Calculate the amount of Ca(NO3)24H2O(s) needed so that the Ca^(2+) is in excess of the iodate ion concentration by 20% (i.e., calculate a weight of calcium nitrate that is 20% higher than the minimum required to produce 10 g of calcium iodate).

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