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How many liters of water should be added to 10 liter of a 20% saline (salt) solution to make a 5% saline solution?

 Oct 9, 2021
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At present you have 2 litres of salt in 8 litres of water   which is 2/10 = 0.2 = 20% saline

 

I want to know how much water I need with 2 litres of salt to get  5% salinity

Let the TOTAL amount of solution be x litres

 

2/x = 0.05

2/0.05 = x

x=40 litres

But 2  we already have 10 litres of that so we need to add 30L of water.

 

check

2/40 = 0.05 = 5%

 

 

You might find that someone can explain this more simply than me.

 Oct 9, 2021

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