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Question

Define Molarity. Calculate the molarity of a solution containing 5 g of NaOH in 500 ml of solution.

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Solution

Molarity Molarity is the concentration of a solution expressed as the number of moles of solute per litre of solution.
Molarity=No. of moles of soluteVolume of solution(in L)
Now,
Molecular mass of NaOH=40g
Given mass of NaOH=5g
No. of moles (n)=Given massMolecular mass=540=0.125 mol
Volume of solution (V)=500mL=5001000=0.5L
Therefore,
Molarity=0.1250.5=0.25M
Hence the molarity of solution is 0.25M.

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