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Standard XIII

Chemistry

Molality

The following...

Question

The following table gives the solubility at different temperatures Answer the question based on this.
Temperature in Kelvin
Substance dissolved 283 293 313 333 353
KNO₃ 21 32 62 106 167
NaCl 36 36 36 36 37
KCl 35 35 40 46 54
NH₄Cl 24 37 41 55 66
Find the solubility of each salt at 293 K.

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Solution

Solubility: The maximum amount of solute that can dissolve in a known quantity of solvent at a certain temperature is its solubility.
According to the given table solubility of given salts at 293K for:
KNO₃ (Potassium Nitrate)= 32g
KCI (Potassium Chloride)=35g
NaCl (Sodium Chloride)=36g
NH₄Cl (Ammonium chloride)=37g

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Rama tested the solubility of four substances at different temperatures and found in grams of each substance dissolved in 100 g of water to form a saturated solution

Now answer the following questions :

(a) Which substance is the least soluble at 293 K?

(b) Which substance shows the maximum change in its solubility when the temperature is raised from 293 K to 313 K?

(d) What is the effect of temperature on the solubility of a salt?

(e) What mass of sodium chloride would be needed to make a saturated solution in 10 g of water at 293 K?

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. 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.

(c) Find the solubility of each salt at 293 K. What salt has the highest solubility at this temperature?

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

The following table gives the solubility at different temperatures Answer the question based on this.

Temperature in Kelvin

Substance dissolved	283	293	313	333	353
KNO₃	21	32	62	106	167
NaCl	36	36	36	36	37
KCl	35	35	40	46	54
NH₄Cl	24	37	41	55	66

Which salt has the lowest solubility at 283 K?

The following table gives the solubility at different temperatures Answer the question based on this.

Temperature in Kelvin

Substance dissolved	283	293	313	333	353
KNO₃	21	32	62	106	167
NaCl	36	36	36	36	37
KCl	35	35	40	46	54
NH₄Cl	24	37	41	55	66

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

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The following table gives the solubility at different temperatures Answer the question based on this. Temperature in KelvinSubstance dissolved283293313333353KNO3213262106167NaCl3636363637KCl3535404654NH4Cl2437415566Find the solubility of each salt at 293 K.

The following table gives the solubility at different temperatures Answer the question based on this.
Temperature in Kelvin
Substance dissolved 283 293 313 333 353
KNO₃ 21 32 62 106 167
NaCl 36 36 36 36 37
KCl 35 35 40 46 54
NH₄Cl 24 37 41 55 66
Find the solubility of each salt at 293 K.