How would you know if a solution is saturated?

When a sample is taken out and cooled, it forms small crystals rapidly

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When the sample starts to evaporate

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When more solid is added, they continue to dissolve in the solution

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When solution changes colour

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Solution

The correct option is A When a sample is taken out and cooled, it forms small crystals rapidly
When a sample is taken out and cooled, it forms small crystals rapidly. (At a given temperature, a solution can only hold a certain amount of solute. A saturated solution is one that contains the maximum amount of solute at a given temperature.)

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Q. A

3.0

g sample of

C u_{2} O

is dissolved in

d i l . H_{2} S O_{4}

where it undergoes disproportionation quantitatively. The solution is filtered off and

8.3

g pure

K I

crystals are added to clear filtrate in order to precipitate

C u I

with evolution of

I_{2}

. The solution is again filtered and boiled till all the

I_{2}

is expelled. Now excess of an oxidizing agent is added to filtrate, which liberates

I_{2}

again. The liberated

I_{2}

this time requires

10

mL of

1.0 N

N a_{2} S_{2} O_{3}

solution. Calculate

%

by mass of

C u_{2} O

in sample.

100 mL of water at room temperature of $25^{\circ} C$ is taken in a beaker and a little of solid S is dissolved in it by stirring to obtain a solution X. More and more of solid S is added to the solution with constant stirring while keeping the temperature of solution constant at $30^{\circ} C .$ After some time it is observed that no more solid dissolves in water and at the same time some solid is also left undissolved at the bottom of the beaker. The contents of beaker are filtered through a filter paper to obtain solution Y in the form of a filtrate.