Question

Sugar solution is given to you in two different testtubes. In one test tube the solution is saturated while in the other it is unsaturated. What test would you do to identify them???

Answer 1

To identify then first we have to see in which solution more of the sugar (solute) can be dissolved. If more of the sugar in the solution can be dissolved then the solution is unsaturated otherwise, it is saturated.

Answer 2

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By adding  cold dilute Baeyer's reagnant

More about Baeyer's Reagnant.

• Baeyer's reagnant is cold dilute

• It is an oxidising agent.

If this mixture is added to an unsaturated compounds such as alkenes or alkanes then :

• Purple colour of  the reagnant changes .

• It is first converted to a green compound   which is unstable in alkaline medium.

• This again changes to brown  

• The supernatant liquid gets decolourised.

However saturated compounds do not respond to the above test.

In simple words........... your answer is :

In order to test unsaturation first add cold dilute Baeyer's reagnant.

If the reagnant decolorises from purple to colourless then the compound is unsaturated

Otherwise if the reaction does not occur , then it is a saturated compound.

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