What is the molality of a 1M NaOH solution?

1 Answer
Ernest Z.
Jun 23, 2018

The molal concentration is 1 mol/kg.

Explanation:

Assume you have 1 L of the solution. Then you have 1 mol (40 g) of #"NaOH"#.

The density of the solution is 1.04 g/mL.

#"Mass of solution" = 1000 color(red)(cancel(color(black)("mL solution"))) × "1.04 g solution"/(1 color(red)(cancel(color(black)("mL solution")))) = "1040 g solution"#

#"Mass of water" = "(1040 - 40) g = 1000 g = 1.0 kg"#

#b = "moles of solute"/"kilograms of solvent" = "1 mol"/"1.0 kg" = "1 mol/kg"#

The molal concentration is 1 mol/kg.

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