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If it is 5%(w/v) then you should add 100 ml of water to 5g of the salt.
If it is 5%(w/w) then you should add 100g of water to 5g of the salt.

w/v - weight in volume
w/w - weight in weight
We generally use 5% of salt to prepare 5% of the solution . If 5g of salt is used then it is 5% of 100. So 100g of water should be mixed with 5g of salt.