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CBSE Class 9 Answered

(a) Calculate the amount of glucose required to prepare 250g of 5% solution of Glucose by mass. (b) What are dispersed phase and dispersed medium in colloids. OR (a) To make a saturated solution, 36g of sodium chloride is dissolved in 100g of water at 293 K. Find its concentration at this temperature. (b) What is the effect of temperature on the solubility of a solid in liquid? (c) Why is it possible to distinguish the particles of solute from those of solvent in a suspension?
Asked by Topperlearning User | 03 Feb, 2015, 04:44: PM
answered-by-expert Expert Answer

(a) Percentage of solution = 5

Mass of solution = 250g

 

Percentage of solution = Mass of solute / Mass of solution  x 100                                         

 

                                  = Mass of solute / 250  x 100

                                           

                                  =  5  x  250 / 100

                                        

                                   =  12.5g


(b) Dispersed phase - the solute like component in a colloid form the dispersed phase.

Dispersed medium - the component in which the dispersed phase is suspended is the dispersed medium

OR

(a) Mass of solute = 36 g

     Mass of solvent = 100g

     Mass of solution = 100 + 36

                           = 136g

Concentration of solution = (Mass of solute / Mass of solution ) x 100

                                   = (36/136) x 100

                                   = 26.47%

(b) If temperature increases, solubility increases and if temperature decreases, solubility decreases.

(c) Because particle size is bigger in suspensions hence it is easier to distinguish the particles of solute.

 

Answered by | 03 Feb, 2015, 06:44: PM
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