Question

Calculate the amount of nacl needed to prepare 50 ml of 0.9% nacl solution and 20% nacl solution

Answer 1

Your answer would be, 
Formula: Molarity (M) = Number of moles of solute/Solutions volume Liters

0.009(50) = .45 gm dissolved in 50 ml H2o
= 0.20(50) = 10 gm





Hope that helps!!!