Experiment 3 Advance Study Assignment: Resolution of Matter into Pure Substances

Question

Experiment 3 Advance Study Assignment: Resolution of Matter into Pure Substances, ll. Fractional Crystallization 1. Using Figure 1, determine the number of gram of KNO, that will dissolve in 100 g of Hoa 100 cc b, the number of grams of water required to dissolve 2s KNO, al 100 C IHint your answer to Part a gives you the newded comersion factor forgKNO, to gHoy g Hao the number of grams of water wquirid rodissolve20gcuso.' 5Huoat 100 c d. the number of grams of water required ut a containing 25 g KNO, solubility of one substance is affected by therfore b. and c. do race need to be added together. R 2. To the solution in Problem ld at loo c, 10g of water at added, and thw Holution is cooled to 0 c.

Explanation / Answer

(b) From (a) it is given that,

247 g. of KNO3 can be dissolved in 100 g. of water.

Then, 25 g. of KNO3 can be dissolved in 25 * 100 / 247 = 10.12 g. of water.

(c)

It is know that,

114 g. of CuSO4.5H2O can be dissolved in 100 g. of water

Then, 20 g. of CuSO4.5H2O can be dissolved in 20 * 100 /114 = 17.54 g. of water

(d)

Amount of water required to dissolve 25 g. of KNO3 and 20 g. of CuSO4.5H2O = 17.54 g.

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