Question

Learning task 4:Using the available materials at home,make the following solutions.Be careful in handling materials.Use the sample problem as a guide to help you solve the % concentration of your prepared solution.


Dissolve 10.0g of a substance in 100.0g of water.,the concentration by mass will be:


Divide the mass of the solute by the total mass of the solution.

c%=10.0g10.0g+100.0g*100%=9.09%



Solutions to make:

1. 450 g flour and 1 L water



2. 500 ml alcohol and 1 L water



3. 300 g rice grains and 540 ml water



4. 450 g sugar and 360 ml coconut milk



5. 50 ml Liquid detergent and 250ml water
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Answer 1

Answer:

1. 2%

2. 10%

3. 2%

4. 2%

Explanation:

Divide 500 and 1 then times niyo sa 100 check niyo pa sa calcu

Ganun rin gawin niyo sa ibang no.

Answer 2

Given: Given quantities are

1. 450 g flour and 1 L water

2. 500 ml alcohol and 1 L water

3. 300 g rice grains and 540 ml water

4. 450 g sugar and 360 ml coconut milk

5. 50 ml Liquid detergent and 250ml water

To find: We have to find % concentration of the solutions.

Solution:

% of concentration is a ratio of mass of solute to mass of solution multiplied by 100.

1. 1 L water is equal to 1000 gram water. So, mass of solution is 450+1000=1450 gram. % concentration will be

$\frac{450}{1450} \times 100 = 31\%$.

2.1 L water will be equal to 1000 ml water. So, mass of solution is 500+1000=1500 L. % concentration will be

$\frac{500}{1500} \times 100 = 33.33\%$.

3.1 L water is equal to 1000 gram water. Thus 540ml water will equal to 540 gram water.

So, mass of solution is 540+300=840 gram. % concentration will be

$\frac{300}{840} \times 100 = 35.7\%$.

4. 1 L water is equal to 1000 gram water. Thus 360 ml liquid detergent will equal to 360 gram.

So, mass of solution is 450+360=810 gram. % concentration will be

$\frac{450}{810} \times 100 = 55.5\%$.

5.Total mass will be 50+250=300ml.

% concentration will be

$\frac{50}{300} \times 100 = 16.66\%$.