'A' is a blue coloured crystalline salt. On heating it loses blue colour and to give 'B'. When water is added, 'B' gives back to 'A'. Identify A and B, write the equation.

1.5 g of solute is dissolved in 15 g of water to form a saturated solution at 298K. Find out the solubility of the solute at the temperature.

What is the mass of sodium chloride that would be needed to form a saturated solution in 50 g of water at 30°C. Solubility of sodium chloride is 36 g at 30°C?

A solution was prepared by dissolving 25 g of sugar in 100 g of water. Calculate the mass percentage of solute.

Find the amount of urea which is to be dissolved in water to get 500 g of 10 % w / w aqueous solution?