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1-Find the grams of KNO3 needed to add to a 0.02 mol kg-1 solution of KNO3(aq)...

1-Find the grams of KNO3 needed to add to a 0.02 mol kg-1 solution of KNO3(aq) containing 3.52 kg of water to raise its ionic strength to 0.17.

2- Find the mean ionic activity coefficient for NaCl in a solution at 25°C that has 0.067 mol kg-1 of NaCl(aq) and 0.160 mol kg-1 in Ca(NO3)2(aq), in reference to the NaCl.

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