Question

During an experiment the students were asked to prepare a 20% (mass/mass) solution of sugar in water. Ram dissolved 20 gm of sugar in 100 gm of water while Sohan prepared it by dissolving 20 gm of sugar in water to make 100 gm of solution.
a) Are the two solutions of the same concentration
b) Compare the mass % of the two solutions.
c) Whose solution contain less amount of solute.

Answer 1

a) No.  

Mass % = Mass of solute  Mass of solute + Mass of solvent ×100

(b) Solution made by Ramesh  

Mass % = 10/ 100 +10 x 100 = 10 /110 x100 = 9.09%  

Solution made by Sarika  

Mass %  = 10 /100 ×100 = 10%  

The solution prepared by Sarika has a higher mass % than that prepared by Ramesh.

c) Ram's solution contain less amount of solute.

Answer 2

Answer and Explanation:

a) No.  

Mass % = Mass of solute  Mass of solute + Mass of solvent ×100

(b) Solution made by Ramesh  

Mass % = 10/ 100 +10 x 100 = 10 /110 x100 = 9.09%  

Solution made by Sarika  

Mass %  = 10 /100 ×100 = 10%  

The solution prepared by Sarika has a higher mass % than that prepared by Ramesh.

c) Ram's solution contain less amount of solute.