Question

Calculate the mass of sodium sulphate Na2SO4 needed to prepare 125 mL of solution with a concentration of 1.98 M

Answer 1

Answer:

1. 98M solution of Na2SO4 means

1.98 moles in 1000ml solution

Therefore,

We can say in 125 ml of 1.98M solution we have

1.98/8 moles of Na2SO4

1 mole Na2SO4 is 140 g

So 1.98/8 moles weighs 34.65g