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Factors Affecting Solubility of Solids in Liquids

Explain why a...

Question

Explain why a hot saturated solution of potassium nitrate forms crystals as it cools?

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Solution

The solubility of nitrate decreases with the fall in temperature. Thus, when the saturated solution of nitrate is cooled the excess of it separates from solution, in the form of crystals.

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Similar questions

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).

(a)

What mass of potassium nitrate would be needed to produce a saturated solution of potassium nitrate in

50

grams of water at

313

(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.

(c)

Find the solubility of each salt at

293 K

. Which salt has the highest solubility at this temperature?

(d)

What is the effect of change of temperature on the solubility of a salt?

Q. Prachi 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.

Q. The weight of an empty china dish is 39 g and when a saturated solution of potassium nitrate is poured into, its weight is 108 g at

50^{\circ} C

. After evaporating the solution to dryness, if the weight of the dish along with the crystals is 72 g then the solubility of potassium nitrate at

50^{\circ} C

is .....................

Q. Assertion :A super-saturated solution of glucose in boiling water crystallizes as it cools. Reason: The solubility increases as the temperature decreases.

Q. Which of these actions will cause more potassium nitrate to dissolve in a saturated potassium nitrate solution?
I. Grind the potassium nitrate and then add to the solution while stirring
II. Add more potassium nitrate while using a magnetic stirrer
III. Add more potassium nitrate and heat the solution

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Factors Affecting Solubility of Solids in Liquids

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