Page 1 - 3.Lesson Notes-Numericals on conc. of solutions
P. 1
SAI International School
Subject-Chemistry
Ch-Is Matter around us pure?
Topic-Numericals based on concentration of solutions
LESSON NOTE
Concentration
It is the amount of solute present in given quantity of solution.
1. Mass Percentage (w/w):
=
Q.1 Calculate the grams of NaC1 (5.25% by mass) in 245 grams of a commercial
bleach solution.
Ans:
=
. =
Or, mass of solute= 5.25 X245 = 12.9 g
100
2. Volume Percentage (V/V):
=
Q.2. Calculate the concentration of a ink solution which contains 20 mL of ink in 500
mL of solution.
Ans: =
= = 4 %(v/v)
Mass by Volume Percentage (w/V):
− =
Q.3. Calculate the concentration of a sugar solution which contains 50g of
sugar per 500 mL of the solution.
