Question

How is 0.5 molal of sodium hydroxide different from 0.5 molar of sodium hydroxide?
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Answer 1

Explanation:

We denote Molality with m and Molarity with M.

Where, Molality(m)=No. of moles of solute/Amount of solvent (in kg)

And Molarity(M)=No. of moles of soulte/Volume of solution(in Litres)

Therefore,

0.5m of NaOH means 0.5 moles of NaOH in 1 kg of solvent

And, 0.5 M of NaOH means 0.5 moles of NaOH in 1 Litre of Solution

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