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At present,210 g of potassium nitrate saturated solution at 60°C is used. If the temperature drops to 20°C, how much g of potassium nitrate crystal is precipitated Solubility of potassium nitrate at 60 g at 60°C and 31.6 g at 20°C At present,210g of potassium nitrate saturated solution at 60°C is used. If the temperature drops to 20°C, what is the mass of potassium nitrate crystal Solubility of potassium nitrate is 110 g at 60°C and 31.6 g at 20°C
Since the solubility of potassium nitrate at 60°C is 110 g, there is a solute of potassium nitrate 110 g and a solvent of 100 g.
Since the solubility of potassium nitrate at 20°C is 31.6 g,31.6 g of potassium nitrate is dissolved in 100 g of solvent.
The precipitated potassium nitrate crystal =110 g -31.6 g =78.4 g
Why don't you ask?
At present,315 g of saturated potassium nitrate solution at 60°C is used. If the temperature drops to 20°C, what is the mass of precipitated potassium nitrate crystal Solubility of potassium nitrate at 60 g at 60°C and 31.6 g at 20°C This is the teacher's problem. It was 210g saturated solution. At present,315g potassium nitrate saturated solution at 60°C is used. If the temperature drops to 20°C, what is the mass of potassium nitrate crystal Solubility of potassium nitrate is 110 g at 60°C and 31.6 g at 20°C This is the teacher's problem. It was 210g saturated solution.
Potassium nitrate saturated solution at 60°C 315g solvent 315g*100g/(100g+110g)=150g solute 315g-150g=165g
Solubility of potassium nitrate at 20°C is 150g*31.6g/100g=47.4g 31.6g 150g water at most
The mass of precipitated potassium nitrate crystals is 165 g-47.4 g=117.6 g
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