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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):
