Answer:
Weigh 80g of Sodium chloride and dissolve it in 100ml of water.
Step-by-step explanation:
The formula for weight percent (w/v) is: [Mass of solute (g) / Volume of solution (ml)] x 100. This is used to prepare a solution of a solid in a liquid.
To prepare 80% solution of sodium chloride in water, 80g of sodium chloride is dissolved in 100ml of water according to the formula above. 80g of sodium chloride is measured in an appropriate weighing balance and carefully transferred to a standard flask and made up to the 100ml mark.