How much amount of NaCl should be added to 600 g of water to decrease the freezing point of water to ?

(The freezing point depression constant for water = 2 K kg mol⁻¹)

Question

How much amount of NaCl should be added to 600 g of water  to decrease the freezing point of water to ?

(The freezing point depression constant for water = 2 K kg mol⁻¹)

Canvas Classes · Accepted Answer

Strategy:
 Depression in freezing point () is a colligative property. Since  is an electrolyte, we must include the van't Hoff factor (). Use the formula  where  is molality.

Step 1: Identify the variables
- Target freezing point =  
- Cryoscopic constant () = 
- Van't Hoff factor for  () = 2 (Assuming complete dissociation)

Step 2: Calculate the required molality ()

Step 3: Determine the moles of  required
Mass of water (solvent) = 600 g = 0.6 kg.

Step 4: Calculate the mass of 
Molar mas

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