What is the expected freezing point of a 0.50  m solution of Na 2CO 3 in water?  K f for water is 1.86°C/ m.     -0.93°C     -6.5°C     -1.9°C     -2.8°C

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What is the expected freezing point of a 0.50  m solution of Na 2CO 3 in water?  K f for water is 1.86°C/ m.
   
-0.93°C
   
-6.5°C
   
-1.9°C
   
-2.8°C
Expert Solution
Introduction

Freezing point depression will be equal to,
ΔTf = i Kf m 

Given that,
Molality = 0.50 m 
Kf = 1.86oC/m
i = 3 for Na2CO3 as it can split into 2 Na+ ions and 1 CO32- ion.  

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