Exercise 13.43 6 of 15 Part A A KNO, solution containing 45 g of KNOs per 100.0

Question

Exercise 13.43 6 of 15 Part A A KNO, solution containing 45 g of KNOs per 100.0 g of water is cooled from 40 ° C to O C. What will happen during cooling? Match the words in the left column to the appropriate blanks in the sentences on the right Reset Help 45 63 85 14 31 58 35 10 At 40 C the solution has g of KNOs per 100 g of water and it can contain up to g of KNOs per 100 g of water. At 0 °C the solubility is gKNOs per 100 g of water, so- gKNOs per 100 g of water will precipitate out of solution. Previous Answers Request Answer F11 12

Explanation / Answer

Solubility is the mass of a solute that can be dissolved in a given mass of solvent (here water) and it  varies according to temperature. At 40 oC KNO3 has solubility in water is 63 g/100 g water and at 0 oC it is 14 g/100 g of water (From solubility graph for potassium nitrate in water).

So, at 0 oC, the excess amount will be precipitated out.

first box - 45, second box - 63, third box - 14, fourth box - 31 (45 g - 14 g).

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