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Concentration by Mass and Volume

Concentration is the amount of solute dissolved in a solution and can be expressed as a percentage by mass or volume. Percentage by mass is calculated as the mass of solute divided by the total mass of the solution, while percentage by volume is the volume of solute divided by the total volume of the solution. Examples are provided to demonstrate calculating percentage concentration by mass and volume for solutions involving substances like salt, ethanol, and glucose dissolved in water.

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238 views3 pages

Concentration by Mass and Volume

Concentration is the amount of solute dissolved in a solution and can be expressed as a percentage by mass or volume. Percentage by mass is calculated as the mass of solute divided by the total mass of the solution, while percentage by volume is the volume of solute divided by the total volume of the solution. Examples are provided to demonstrate calculating percentage concentration by mass and volume for solutions involving substances like salt, ethanol, and glucose dissolved in water.

Uploaded by

mel vin
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© © All Rights Reserved
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Concentration is the amount of solute in a given solution.

Concentration by Percent:
It is the amount of solute dissolves in 100 g solvent.

Example 1: 10 g salt and 70 g water are mixed and solution is prepared. Find
concentration of solution by percent mass.

GIVEN
Mass of Solute= 10 g
Mass of Solution= 10 + 70 = 80 g
% Solution by mass=?

SOLUTION
%mass= mass of solute x 100 = 10g x 100 = 12.50 %
mass of solution 80g

Example 2. What is the percent by volume of a solution formed by mixing


25mL of isopropanol with 45mL water?

GIVEN
Volume of Solute= 25 mL
Volume of Solution= 25mL + 45mL = 70mL
% Solution by volume=?

SOLUTION
%volume= volume of solute x 100 = 25mL x 100 = 35.71 %
volume of solution 70mL
Seatwork
Solve the following. (Given 1pt, Solution 3pts, Final
answer 1pt)

1. The active ingredient in wines and other alcoholic


beverages is ethanol. A 300mL sample of wine was
found to contain 37.5mL of ethanol. What is the
percentage by volume concentration of ethanol in the
wine sample?

2. What is the percent by mass concentration of a


solution that contains 5.30 g of salt dissolved in 19.7 g
of water?

3. What is the percent by mass concentration of a


solution that contains 5.30g of salt dissolved in 19.7g
of water?

4. You have 200g or a solution that contains 30g of


hydrochloric acid (HCl), what percentage of your
solution is made up of HCl acid?

5. What is the percentage concentration in the following


solution given 2g sucrose in 80g water?

6. How many grams of glucose (C6H12O6) are needed to


prepare 400mL of a 5% glucose solution?
7. Suppose you want to make 2000g of a solution of
glucose in water that has 2.8% (m/m) concentration.
How much glucose should you use?

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