Question

How would you know if a solution is saturated?
A.When a sample is taken out and cooled, it forms small crystals rapidly
B.When the sample starts to evaporate
C.When more solid is added, they continue to dissolve in the solution
D.When solution changes colour

Answer 1

A Saturated solute is a solute which has an end point till which it can dissolve any added solute in it whereas unsaturated solute can add any amount of added salt as possible. So the saturated solute will lead to formation of crystals very fast and easily.

Complete step by step answer:
Saturated solutes are the solutes, in which if we add more solute it does not dissolve further whereas in case of unsaturated solutes, when we add more solute it dissolves further. Hence to know if a solute is saturated or not just add some little solute, if the given solute dissolves it is saturated otherwise it isn’t saturated.
In the above options, in option (B) both of the samples will evaporate so it isn’t a good way to check the saturation.
In option (C), though saturated samples will have an endpoint when the whole sample will get saturated but we don’t know what is the saturation level of both the samples.
In option (D), we don’t know which type of sample is given to us, so we aren’t sure which sample will change colour and which one will not change the colour.
Therefore, out of the four options, option (A) would be the best to check if the sample is saturated or not.
Hence option(A) is the correct option

Note:
Both of the saturated sample and unsaturated sample will evaporate and will add solute inside them but the formation of crystals in case of saturated sample will be fast and much earlier.