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A 2 molal solution of sodium chloride in...

A 2 molal solution of sodium chloride in water causes an elevation in the boiling point of water by `1*88 K`. What is the value of van't Hoff factor? What does it signify ? `[K_b = 0*52 " K kg " mol^(-1)]`

Text Solution

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`DeltaT_(b)= i xx K_(b) xx m" "`...(i)
Here, `DeltaT_(b)= 1.88, m=2`
`K_(b)=0.52"K kg mol"^(-1)`
Substituting the values in eq. (1), `1.88 = i xx 0.52 xx 2`
`i=(1.88)/(0.52 xx 2)=1.80`
As `igt 1`, it signifies that the sodium chloride is an electrolyte and it undergoes dissociation in the solution.
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