Question

Calculate the molarity of a saline solution prepared by dissolving 41.2g of sodium chloride in 550mL of water.

Answer 1

1.282 M.

Step-by-step explanation:

• Molarity is defined as the no. of moles o solute dissolved in a 1.0 L of the solution.

M = (no. of moles of solute) / (V of solution (L))

M = (mass/molar mass)of NaCl / (V of solution (L))

mass of NaCl = 41.2 g, molar mass of NaCl = 58.44 g/mol, V of solution = 550 mL = 0.55 L.

∴ M = (mass/molar mass)of NaCl / (V of solution (L)) = (41.2 g / 58.44 g/mol) / (0.55 L) = 1.282 M.