The amount of solutes ‘A’, ‘B’ and ‘C’ in $300$ g of water at $25 ° C, 40 ° C$ and $60 ° C$ in their saturated solutions are given below. Identify the correct statement from the following when hot saturated solutions of A, B and C are cooled slowly from $60 ° C$ to $25 ° C$ .
$25 ° C$ $40 ° C$ $60 ° C$
A $110 g$ $90 g$ $105 g$
B $140 g$ $170 g$ $180 g$
C $130 g$ $150 g$ $140 g$

$5$ g of A and $40$ g of B are precipitated.

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$30$ g of B and $20$ g of C are precipitated.

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$15$ g of A and g of C are precipitated.

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$40$ g of B and $10$ g of C are precipitated.

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Solution

The correct option is D
$40$ g of B and $10$ g of C are precipitated.

Explanation of correct option:
Let us assume the solutions are present in their saturated state at $60 ° C$ i.e., the amount present at $60 ° C$ for each of them.
For solute A
As temperature decreases form $60 ° C$ to $40 ° C$ , $15 g$ of A will be precipitated. While going from $40 ° C$ to $25 ° C$ nothing will happen as the dissolved amount after precipitation ( $105 - 15 = 90 g$ ) is lower than the amount of saturated solution at $25 ° C$ ( $110 g$ ).
For solute B
As temperature decreases form $60 ° C$ to $40 ° C$ , $10 g$ of B will be precipitated. While going from $40 ° C$ to $25 ° C$ another $30 g$ will be precipitated. So, a total of $40 g$ will be precipitated.
For solute C
As temperature decreases form $60 ° C$ to $40 ° C$ , nothing will happen as solubility increases. While going from $40 ° C$ to $25 ° C$ $10 g$ of C will be precipitated.
So, a total of $15 g$ , $40 g$ , $10 g$ of A, B and C respectively will be precipitated in each case.
$40$ g of B and $10$ g of C are precipitated.

Hence, the correct option is (D).

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The amounts of solutes ‘A’, 'B' and ‘C’ in $300$ g of water at $25 ° C$ , $40 ° C$ and $60 ° C$ in their saturated solutions are given below. Identify the true statement among the following:

	$25 ° C$	$40 ° C$	$60 ° C$
A	$110$ g	$90$ g	$105$ g
B	$140$ g	$170$ g	$180$ g
C	$130$ g	$150$ g	$140$ g

Two saturated aqueous solution A and B using the same solute are prepared at 25°C and 40°C respectively.

The densities of A and B are 1200g/I and 1300g/I at the given temperature 600g of solution A is heated to 40°C from 25°C.

x g of solute is added to it in order to saturate it. Then this solution is cooled to15°C and 75g solute is precipitated.

Consider the density of water as 1 g/cc at all given temperatures and the addition of solute in water does not alter the volume of the solution.

Calculate the density of the solution in g/I at 15°C

Q. The solubility of a salt at

40^{o} C

25 g m

and at

100^{o} C

it is

75 g m

. A saturated solution of

1.5 g m

of the salt is cooled from

100^{o} C

40^{o} C

. How much salt settle down?

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