3.0 molal of NaOH solution a density of 1.110g/ml.the molarity of the solution is??????
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Solution
3 molal solution means 3 moles of solute in 1000 gm of solvent. Mass of 3 moles of NaOH = 3 x molar mass of NaOH = 3 x 40 = 120 g Mass of solvent = 1000 gm Mass of solution = mass of solute + mass of solvent = 120 + 1000 = 1120 g
Volume of solution = mass of solution/density of solution = 1120/1.110 = 1009 ml = 1.009 L
Molarity of solution = moles of solute/volume of solution = 3/1.009 = 2.97 M