1-A KNO3 solution containing 47 g of KNO3 per 100.0 g of water is cooled from 44

Question

1-A KNO3 solution containing 47 g of KNO3 per 100.0 g of water is cooled from 44 C to 0 C.

What mass of KNO3 will precipitate?

2-An aqueous NaCl solution is made using 140 g of NaCl diluted to a total solution volume of 1.30 L .(Express your answer using three significant figures.)

Calculate the molarity of the solution.

Calculate the molality of the solution. (Assume a density of 1.08 g/mL for the solution.)

Calculate the mass percent of the solution. (Assume a density of 1.08 g/mL for the solution.)

Explanation / Answer

Ans 1 : the siolubility of KNO3 at 0 degrees C is 14 g/100 g of water

So when the solution is coooled from 44 degrees C to 0 degrees C , the amount of KNO3 to precipitate will be :

= 47 g - 14 g

= 33 g

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