Calculating Freezing Point of 50% Antifreeze Radiator Fluid

In summary, the freezing point of a 50% antifreeze radiator fluid can be calculated using the formula: freezing point = -1.86 * molality of antifreeze. The freezing point depression constant (Kf) for antifreeze is approximately 1.86 °C/m for a 50% solution. The freezing point of antifreeze can be calculated for any concentration by knowing the molality of antifreeze. It is important to calculate the freezing point of antifreeze to determine its effectiveness in preventing water from freezing. Other factors that can affect the freezing point include the type and concentration of antifreeze, the purity and quality of the antifreeze and water used.
  • #1
sunnyorange
7
0
What is the freezing point of radiator fluid that is 50% antifreeze by mass? for water is 1.86 .

I used
delta: K_fc_m
First I found the molar mass of ethylene glycol to be 62.07 g/mol. Then I multiplied 1/62.06 by 500g/1 kg to get 8.06 mol/kg for cm. I plugged these values in and got 15 C. However it is incorrect. I then thought to say that -15C was the freezing point, this was also wrong.

Please help!
 
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  • #2
What's the other 50% of the radiator fluid?
 
  • #3
Usually water.
 
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FAQ: Calculating Freezing Point of 50% Antifreeze Radiator Fluid

1. How do you calculate the freezing point of 50% antifreeze radiator fluid?

The freezing point of a solution depends on the concentration of the solute (in this case, antifreeze) in the solvent (water). To calculate the freezing point of a 50% antifreeze radiator fluid, you can use the formula: freezing point = -1.86 * molality of antifreeze. Molality is the number of moles of solute per kilogram of solvent. So, for a 50% antifreeze solution, the molality of antifreeze would be 0.5 moles per kilogram.

2. What is the freezing point depression constant for antifreeze?

The freezing point depression constant (Kf) for antifreeze is a constant that is specific to each solvent and solute combination. For a 50% antifreeze solution, the Kf for water is approximately 1.86 °C/m. This means that for every mole of antifreeze added to one kilogram of water, the freezing point will be lowered by 1.86 °C.

3. Can the freezing point of antifreeze be calculated for other concentrations?

Yes, the freezing point of antifreeze can be calculated for any concentration using the formula mentioned above. You would just need to know the molality of antifreeze in the solution, which can be calculated by dividing the number of moles of antifreeze by the mass of the solvent (water) in kilograms.

4. Why is it important to calculate the freezing point of antifreeze?

Knowing the freezing point of antifreeze is important because it helps determine the effectiveness of the solution in preventing water from freezing in the radiator. If the freezing point of antifreeze is too high, it may not provide enough protection against freezing temperatures. On the other hand, if the freezing point is too low, it could mean that there is too much antifreeze in the solution, which can lead to other issues such as reduced heat transfer efficiency.

5. Are there any other factors that can affect the freezing point of antifreeze radiator fluid?

Yes, there are several other factors that can affect the freezing point of antifreeze radiator fluid. These include the type and concentration of antifreeze used, the purity of the antifreeze, and the quality of the water used in the solution. It is important to use high-quality antifreeze and water to ensure accurate and consistent results when calculating the freezing point.

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