What would you observe when :
(a) A saturated solution of potassium nitrate prepared at `60^(@)C` is allowed to cool to room temperature ?
(b) A mixture of iron filings and sulphur is heated strongly ?
(c ) A colloidal solution of starch is passed through an ordinary filter paper ?

What happens when a saturated solution of sodium chloride prepared at 60^(@)C is allowed to cool at room temperature ?

What would you observe when (a) a saturated solution of potassium chloride prepared at 60^(@) C is allowed to cool at room temperature? (b) an aqueous sugar solution is heated to dryness? (c) a mixture of iron filings and sulphur powder is heated strongly?

What do you think would happen when a mixture of iron filings and sulphur powder is heated ?

A student , determined the solubility of four substabces ,potassium nitrate ,sodium , sodim choride ,potassium choride and ammonium choride in a water at five different temperatures of 10^(@)C, 20^(@(C 40^(@)C,60^(@) C and 80^(@)C and obtained the following data : (a) what mass of potassium nitrate woulds be needed to make a satured solution of potassium nitrate in 50 grams of water at 40^(@)C ? (b) what would be observed if a saturated solution of potassium choride at 80^(@)C is left to cool to the room temperature ? ( c) what is the solubilty of each salt at 20^(@) C ? which salt has the highest solubility at this temperature ? (d) what is the effect of change of temperature on the solbubility of a salt as shown by the above date?

Pragya tested the solubility of three different substances at different temperatures and collected the data as given below (results are given in the following table, as grams of substance dissolved in 100 grams of water to form a saturated solution). (a) What mass of potassium nitrate would be needed to produce a saturated solution of potassium nitrate in 50 grams of water at 313 K ? (b) Pragya makes a saturated solution of potassium chloride in water at 353 K and leaves the solution to cool at room temperature. What would she observe as the solution cools ? Explain. (c ) Find the solubility of each salt at 293 K . Which salt has the highest solubility at this temperature ? (d) What is the effect of change of temperature on the solubility of a salt ?

Pargya tested the solubility of four different substances at different temperatures and collected the data as given below (results are given in the following table as grams of substance dissolved in 100 grams of water to from a saturated solutin). (a) What mass of potassium nitrate would be needed to procuce a strurated solution of potassium nitrate in 50 grams of water at 313 K ? (b) Pragya makes a saturated solution of potassium chloride in water at 353 K and leaves the solution to cool at room temperature. What would she observe as the solution cools ? Explain. (c ) Find the solubility of each salt at 293 K. Which salt has the highest solubility at this twmperature? (d) What is the effect of change in temperature on the solubility of a salt ?

Explain what is observed when ltbr. a. An electrolyte NaCl is added to hydrated ferric oxide sol. b. Electric current is passed through a colloidal sol. c. When a beam of light is passed through a collidal solution.