Question

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

Answer 1

Mass % of sodium sulphate in the solution = 20%
If the total mass of the solution = 100g
Then mass of sodium sulphate = (20/100)x100 = 20g
Mass of water = 100-80= 20g


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Answer 2

Let the mass of sodium sulphate required be ' x ' g

The mass of water = 100 g

The mass of solution = ( mass of sodium sulphate + mass of water ) = ( x + 100 ) g

Percentage of sodium sulphate in solution = ( Mass of sodium sulphate / Mass of solution ) * 100

20 = [ x / ( x + 100 ) ] * 100

20x + 2000 = 100x

80x = 2000

x = 2000 / 80

x = 25 g

THEREFORE , THE MASS OF SODIUM SULPHATE REQUIRED IS 25 G.