Question

How many ml of a 0.2w/w% NaOH solution (d=1.2 g/ml) contains 1.32g solute ?

I dont what should I do

Answer 1

550 ml

Explanation:

In a 0.2% w/w solution, 0.2 g of solute is found in 100 g of solution. Therefore, 1.32 g of solvent is found in:

`(1.32/0.2) times 100 = 660` g

To get the volume in ml, rearrange the relationship between density D, mass M and volume V, `D = M/V` to give `V = M/D`

And plug in the numbers: Volume = (660 / 1.2) = 550 ml.