If a solution of NaOH has a 20% mass percent of NaOH and a density of...

If a solution of NaOH has a 20% mass percent of NaOH and a density of 1.22 g/ml, what is the molarity of this solution ?

Expert Solution

Answer –

We are given, 20% mass percent of NaOH , density = 1.22 g/mL

So, 20% mass percent of NaOH means 20 g of NaOH in 100 g of solution

So, moles of NaOH = mass of NaOH / molar mass of NaOH

= 20 g / 39.9969 g.mol^-1

= 0.500 moles of NaOH

Now we need to convert 100 g od solution to volume

We know,

Density = mass / volume

So, volume = mass / density

= 100 g / 1.22g.mL^-1

= 81.97 mL

So, molarity of solution = 0.500 mole / 0.08197 L

= 6.1 M

So, molarity of this solution is 6.1 M

queen_honey_blossom answered 8 months ago

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