What is the freezing point of a 0.05500 m aqueous solution of $N a N O_{3}$ $NaNO_3$ , if the molal freezing-point-depression constant of water is 1.86°C /m?

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Answer 1 · 2016-12-28T09:54:52

We know the depression of freezing point

$DeltaT_f=K_fxxbxxi$

Where

$K_f->"cryoscopic consrant"=1.86^@"C/m"$

$b->"molal concentration"=0.055m$

$i->"Van'tHoff factor"=2" for "NaNO_3 "*"$

$"*"$ As $NaNO_3$ dissociates as follows producing 2 ions per molecule.

$NaNO_3rightleftharpoonsNa^+ +NO_3^(-)$

So

$DeltaT_f=1.86xx0.055xx2~~0.2$

So the freezing point of the given aqueous solution will be $-0.2^@C$

What is the freezing point of a 0.05500 m aqueous solution of NaNO_3NaNO3NaNO_3, if the molal freezing-point-depression constant of water is 1.86°C /m?