3. percent by volume, is the amount of solute in a
given volume of solution expressed as grams
solute per 100 milliliter of solution (g/100 mL),
and
percent by mass, is the amount of solute in a
given mass of solvent expressed as grams solute
per 100 grams of solution.
Concentration of Solution is
expressed as:
4. Sample problem 1
How many mL of ethyl alcohol are
present in an 80 mL bottle of solution,
with 70% concentration?
80ml 56 ml
5. This means that an 80ml total volume of
solution with 70% concentration contains 56 ml
of dissolved ethyl alcohol.
Thus, only 24ml is water (solvent).
6. Sample problem 2
A one peso coin has a mass of 3.5
grams. How many grams of copper
are in a one peso coin containing
75% copper by mass?
7. 75% by mass means 75 grams of copper in
100 grams of one peso coin.
So, a 3.5 grams one peso coin contains,
3.5 2.63g
8. To get the percent concentration by
volume/mass, we use this formula:
𝑚𝑎𝑠𝑠 % =
𝑚𝑎𝑠𝑠 𝑜𝑓 𝑠𝑜𝑙𝑢𝑡𝑒
𝑚𝑎𝑠𝑠 𝑜𝑓 𝑠𝑜𝑙𝑢𝑡𝑖𝑜𝑛
𝑥 100%
𝑣𝑜𝑙𝑢𝑚𝑒 % =
𝑣𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝑠𝑜𝑙𝑢𝑡𝑒
𝑣𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝑠𝑜𝑙𝑢𝑡𝑖𝑜𝑛
𝑥 100%
9. Problem #3
Liza dissolved 10 ml food coloring in 40 ml
water . What will be the percent concentration
by volume of the solution?
𝑣𝑜𝑙𝑢𝑚𝑒 % =
𝑣𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝑠𝑜𝑙𝑢𝑡𝑒
𝑣𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝑠𝑜𝑙𝑢𝑡𝑖𝑜𝑛
𝑥 100%
𝑣𝑜𝑙𝑢𝑚𝑒 % =
10𝑚𝑙
40𝑚𝑙
𝑥 100%
= 25%
