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Elevation in Boiling Point

Which of the ...

Question

Which of the following aqueous solutions should have the highest boiling point?

1.0 M

N a O H

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1.0 M

{N a}_{2} {S O}_{4}

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1.0 M

{N H}_{4} {N O}_{3}

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1.0 M

K {N O}_{3}

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Solution

The correct option is A $1.0 M$ ${N a}_{2} {S O}_{4}$
we have,

$Δ T_{b} = i K_{b} m$

$Δ T_{b} = T_{b} - 373 K$

$T_{b}$ is boiling point of solution,

$T_{b} = 373 + i K_{b} m$

for $N a_{2} S O_{4} ⟶ 2 N a^{+} + S O_{4}^{2 -}$ , we have $i = 3$

$T_{b} = 373 + 3 K_{b} m$

so, it has highest boiling point .

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