1. Using Figure 2, determine a. the number of grams of KNO3 that will dissolve i
ID: 816935 • Letter: 1
Question
1. Using Figure 2, determine
a. the number of grams of KNO3 that will dissolve in 100.0 g of H2O at 100
Using Figure 2, determine the number of grams of KNO3 that will dissolve in 100.0 g of H2O at 100 degree C. the number of grams of water required to dissolve 20.0 g of KNO3 at 100 degree C. (Hint: the number of grams of water required to dissolve 2.0 g CuSO4 at 100 degree C. the number of grams of water required at 100 degree C to dissolve a mixture containing your answer to la gives you the needed conversion factor for g KNO3 to g H20.) 20.0 g KNO3 and 2.0 g CuSO4 Assume that the solubility of one substance is not affected by the presence of another. This is a reasonable assumption for a dilute ionic solution. To the solution in Problem 1d. at 100 degree C, 15.0 g of water are added, and the solution is cooled to 0 degree C. How much KNO3 remains in solution? (See Fig. 2.) How much KNO3 crystallizes out? How much CuS04 crystallizes out? What percent of the KNO3 in the sample is recovered?Explanation / Answer
1)
a) 240 gms of KNO3 dissolves in 100 g H2O
b)(100/240)*20 = 8.33 gms H2O reqd.
c)(100/180)*2 = 1.11 gms H2O reqd.
d)The higher water requirement will be the solution.
20 gms KNO3 requires 8.33 gms of H2O
2 gms CuSO4 requires 1.11 gms of H2O
8.33 gms of water required.
2)15 gms of H2O is added.
Total water content is 15 + 8.33 = 23.33 gms
At 0 deg. , 100 gms water can dissolve 13 gms KNO3
23.33 gms can dissolve 3.03 gms KNO3
a) 3.03 gms KNO3 remain in the solution.
b) (20 - 3.03) = 16.97 gms remain in the solution.
c)At 0 deg. , 100 gms water can dissolve 21 gms CuSO4
23.33 gms can dissolve 4.9 gms CuSO4.
Since only 2 gms CuSO4 is present , no crystallization occurs.
d) (16.97/20)*100 = 84.8 % KNO3 is recovered.
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