Purpose: Find crystallization temperatures for 7 concentrations of KNO3 and make a solubility graph

Materials: KNO3, test tube, stir rod, weigh boats, hot plates, thermometer, 10 mL graduated cylinder.

Procedure:

-In two test tubes, put exactly 5 mL water in each

-Put assigned amount KNO3 in each

-Heat in hot water bath until dissolved- you may stir with sitr rod

-Find crystallization temperature as test tube cools -use a cold water bath for lower concentrations

Table:

Grams KNO3Grams H2OGrams KNO3 per 100g H2OActualCrystallization Temp.Class Average
25402425, 24, 2424, 26, 23, 24
35603841, 40, 33, 4642, 37, 38, 40
45804955, 50, 5549, 51, 50, 53
551005757, 66, 6459, 57, 62, 62
651206671, 71, 6466, 66, 64, 72
751407377, 70, 7173, 77, 72, 73
851607879, 77, 8081, 80, 75, 79

solubility-of-kno3-graph

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