Question

plzzz answer the question no 21?

Answer 1

(a)The sollubilty of potassium nitrate at 40°C is 62gm. This means that 62 grams of potassium nitrate is needed to make a saturated solution of potassium nitrate in 100 grms of water at 40°C. So, to make a saturates solution in 50 gm of water we will require half of 62 grams potassium nitrate which is 62/2 = 31 grams of potassium nitrate.
(b) When a saturated solution of potassium chloride at 0°C is left to cool the solid potassium chloride(or crystals of potassium chloride) will gradually separate out from the sloution(because sloubity decreases on cooling).
(c) The solubitlity of varoious salts at 20°C is : Potasssium nitrate 32gm; Sodium Chloride 33gm; potassium chloride 35 gm; and ammonium chloride 37 gm. Ammonium chloride has the highest sloubitly(37gms) at 293K.
*T Kelvin - 273 = t°C