Question

calculate the mass of sodium sulphate required to prepare its 20 percent solution in 100 g of water

Answer 1

Let the mass of sodium sulphate required be =xg=xg

The mass of solution =(x+100)g=(x+100)g

x g of solute in (x + 100) g of solution

20% =xx+100×100=xx+100×100

20x+2000=100x20x+2000=100x

80x=200080x=2000

x=200080x=200080

=25g