What do you understand by the statement that the solubility of potassium nitrate is 65 g/100 g of water at 40°C?

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Solution

Solubility is the maximum amount of a substance that will dissolve in a given amount of solvent at a specified temperature.
The solubility of potassium nitrate at 40°C is 65 g/100 g of water.
It states that the maximum of potassium nitrate 65 g is soluble at 40°C in 100 g of water

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You are required to prepare 100 gm of crystals of pure potassium nitrate from its saturated solution at 75°C. The room temperature is 20°C and the solubility of potassium nitrate at 75°C and 20°C is 155 gm and 31 gm per 100 g of water respectively. Find the initial weight of potassium nitrate required to achieve it, assuming water available is 100 gm.

Q. Pragya tested the solubility of three different substances at different temperatures and collected the data as given below( results are given in the following table, as grams of substance dissolved in 100 grams of water to form a saturated solution).

Substance dissolved	Temperature in K
Substance dissolved	283	293	313	333	353
Potassium nitrate	21	32	62	106	167
Sodium chloride	36	36	36	37	37
Potassium chloride	35	35	40	46	54
Ammonium chloride	24	37	41	55	66

(a) What mass of potassium nitrate would be needed to produce a saturated solution of potassium nitrate in 50 grams of water at 313 K?

(b) Pragya makes a saturated solution of potassium chloride in water at 353 K and leaves the solution to cool at room temperature. What would she observe as the solution cools? Explain.

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What do you understand by the statement that the solubility of potassium nitrate is 65 g/100 g of water at 40°C?

Solubility is the maximum amount of a substance that will dissolve in a given amount of solvent at a specified temperature.The solubility of potassium nitrate at 40°C is 65 g/100 g of water.It states that the maximum of potassium nitrate 65 g is soluble at 40°C in 100 g of water

Solubility is the maximum amount of a substance that will dissolve in a given amount of solvent at a specified temperature.
The solubility of potassium nitrate at 40°C is 65 g/100 g of water.
It states that the maximum of potassium nitrate 65 g is soluble at 40°C in 100 g of water