# Chemistry

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Determine the number of grams of water which are required to dissolve a mixture of 25 g of KNO3 and 2.0 g of CuSo4 * 5H20 AT 100 Degrees celscius?

• Chemistry -

We need the solubility numbers for KNO3 and CuSO4.5H2O. YOu must have them in a table, either in your text, notes, or in the problem. (Note the correct spelling of celsius.)

• Chemistry -

So, the soulubility for Kno3 IS 245 of 100 grams in water. The solubility for CuSo4 is 180 grams over 100 grams of water. How would you solve that?

• Chemistry -

Is that the solubility at 100 C? I assume it is. Then KNO3 will require
100g H2O x (25/245) = about 10 g H2O (but you need to do it more accurately).
CuSO4.5H2O will require
100 g x (2/180) = about 1 gram H2O.
Generally, one does not add the masses of the water. Generally, the more soluble salt (in this case KNO3) will take about 10 g H2O to dissolve it AND the solution will have enough room to dissolve the smaller amount of CuSO4.5H2O also.

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