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Question: How do you make up certain concentrations of a solution, starting from a 1% solution?
 

Answer: It is perhaps easiest to explain the way to get the answer by dealing with numbers. If we assume you have 10 ml of your 1% solution, then to dilute this to 0.2% (i.e. one fifth) then you would need to take 1/5 of your 1% solution, which would be in this example 1/5 of 10 = 2ml. To make up the total of 10ml, you would now need 8ml of water. Similarly, to dilute to 0.4% (i.e. two fifths), you would need 4/5 of 10 = 4ml. To make this up to the total of 10ml, you would need to add 6ml of water. This is then repeated for the concentrations you would need.


Here is a table that you might find useful:


Total Volume

Volume of Water

Volume of 1% concentration

Final Concentration of solution

10 ml

0 ml

10 ml

1%

10 ml

1 ml

 9 ml

0.9%

10 ml

2 ml

 8 ml

0.8 %

10 ml

3 ml

 7 ml

 0.7%

10 ml

4 ml

 8 ml

0.6%

10 ml

5 ml

 5 ml

0.5%

10 ml

6 ml

 4 ml

0.4%

10 ml

 7 ml

3 ml

0.3%

10 ml

8 ml

 2 ml

0.2% 

10 ml

9 ml

1 ml 

0.1% 





 

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