Question

a saturated solution was obtained at 25 degree Celsius what will happen if it is kept in 40 degree Celsius

Answer 1

If saturated solution is heated the solution become unsaturated because solubility is directly depends upon temperature, so on heating solubility of the solution increase and its become unsaturated or in other words the solution is now capable to take some more solute into it....... 
I hope it would help you...

Answer 2

its solubility increase because heat transfer more kinetic energy to the atoms of the solution which make them more vibrate and hence more gap between atoms ,that's why its solubility increase. and it is no more saturated