Sudha tested the solubility of four salts X, Y, Z and T as different temperature and collected the following data. (Solubility refers to the amount in grams dissolved in 100 g of water to give a saturated solution.)

Answer the following question from the table
(i) Which salt has the highest and lowest solubility at 323 K ?
(ii) A student prepared a saturated solution of X at 323 K and then added 25 g water to it. Water mass of X must be added to again make the solution saturated ?
(iii) The solubility of which salt is least affected by increase in temperature ?
(iv) What mass of 'T' would be required to make saturated solution in 200 g of water at 290 K ?

Explanation

(I) At 323 K, salt Y has the highest solubility in water while salt Z has the lowest solubility
(ii) By definition of saturated solution,
100 g of water at 323 K contain salt = 40 g
125 g of water at 323 K contain salt = `((40 g))/((100g)) xx (125 g) = 50 g`
`therefore` Mass of salt to be added to make the solution again saturated = (50 - 40) = 10 g
(iii) The data shows that the solubility of the salt Y is least affected with increase in temperature.
(iv) At 290 K, mass of T required to make the saturated in 200 g of water = `((25 g))/((100g)) xx (200g) 50 g`