Question

Calculate molality of mixture of solution produced by mixing 25% W/W of NaOH solution with 15% W/W solution.​

Answer 1

$\huge{\underline{\sf{\red{Answer}}}}$

❥Let x be the mass of solution.

Mass of NaOH=

100

x×20

❥Molar mass of NaOH=40g

∴ Number of moles= (

100

20x

)/40=

200

x

❥Now mass of solvent in the solution= x−

100

20x

=

100

80x

❥∴ Molality=

(80x/100)

x/200

×1000=6.25M

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