The solubility of KNO3 is 155 g per 100.0 g of water at 75°C and 38.0 g at 25°C,

Question

The solubility of KNO3 is 155 g per 100.0 g of water at 75°C and 38.0 g at 25°C, what mass (in grams) of KNO3 will crystallize out of solution if exactly 175.0 g of its saturated solution at 75°C is cooled to 25°C?
Show me the steps please And what formal did you use? The solubility of KNO3 is 155 g per 100.0 g of water at 75°C and 38.0 g at 25°C, what mass (in grams) of KNO3 will crystallize out of solution if exactly 175.0 g of its saturated solution at 75°C is cooled to 25°C?
Show me the steps please And what formal did you use? The solubility of KNO3 is 155 g per 100.0 g of water at 75°C and 38.0 g at 25°C, what mass (in grams) of KNO3 will crystallize out of solution if exactly 175.0 g of its saturated solution at 75°C is cooled to 25°C?
Show me the steps please And what formal did you use?

Explanation / Answer

Lets assume that water = x g at 75 0C

Then quantity of KNO3 =155g/100g x = 1.55x g

And total mass = 175 g

So

x + 1.55x = 175

So

x = 68.6274

so 1.55x = 106.37

Hence 175 g saturated solution means that 106.37 g of KNO3 is dissolved in 68.627 g of water

When it will cooled to 25 0C.
Mass of KNO3 dissolved = 68.627 x 0.38 = 26.07 g

So

Mass of KNO3 crystallize out = 106.37 - 26.07 = 80.29 g

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