Question

If you need to make a 5.6% solution of `NaCl` using 9.6g of `NaCl`, how many grams of water is needed?

Answer 1

`161.8*g` of water is required.

Explanation:

`"Mass of sodium chloride"/"Mass of solution"xx100% = 5.6%`

So `(9.6*g)/"Mass of solution"= 0.056`

So `(9.6*g)/(0.056) ="Mass of solution"= 171.4*g`

Of course the mass of solution includes the `9.6*g` mass of sodium chloride. So we require `171.4*g-9,6*g" of water"` `=` `161.8*g`