Question

5g of salt was dissolved in water and a 100 g solution was produced
1.give the composition of this solution as mass fraction
2.when more table salt was added and stirred to the above solution, it precipitated without dissolving . At this state ,how is the solution called?
3.Give an action that you can perform to dissolve this precipitated salt.
4.can you dissolve this table salt in kerosene? Give reason for your answer

Answer 1

here you go-

1- mass fraction is mass of solute/mass of solution so it is 0.05 here.

2-when no more table salt can be added and if tried then it is precipitating,this state of solution is called as 'saturated solution'.Means no more solute can be dissolved in the solution at this particular temperature,pressure etc.

3-To dissolve the precipitated salt,heat the solution.It will break bonds and new bonds will be formed.Also some solution will be evaporated.So the answer is just heat it and stir constantly with a spoon.

4- No you can not dissolve it in Kerosene.There in a rule in solution chemistry that "like dissolves like" means polar compound will dissolve in polar solvent.As water is polar and table salt is polar too,it dissolves in water.But kerosene is alkane or parrafin compound,which are non polar in nature.So salt will not dissolve.

Try this at home but with your parents.

Thanks.
Tripathy.