Which Salt Makes the Best Hot Pack?

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SUMMARY

The discussion centers on the effectiveness of different salts—Sodium Chloride, Ammonium Chloride, and Calcium Chloride—as hot packs when mixed with water. The initial temperature of the water was recorded at 24.5 degrees Celsius for Sodium Chloride and 25 degrees Celsius for both Ammonium Chloride and Calcium Chloride. Participants emphasized the importance of measuring the temperature after adding the salts to determine their impact on thermal energy. The conclusion drawn is that empirical measurement is essential to understand the thermal effects of these salts.

PREREQUISITES
  • Basic understanding of thermodynamics
  • Knowledge of solubility and dissolution processes
  • Familiarity with laboratory equipment, specifically beakers and thermometers
  • Experience in conducting scientific experiments and recording data
NEXT STEPS
  • Conduct experiments measuring temperature changes with Sodium Chloride, Ammonium Chloride, and Calcium Chloride
  • Research the thermodynamic properties of each salt, focusing on endothermic and exothermic reactions
  • Explore the concept of solvation and its effects on temperature changes in solutions
  • Investigate alternative salts and their effectiveness as hot packs
USEFUL FOR

Students conducting chemistry experiments, educators teaching thermodynamics, and anyone interested in the practical applications of salts in thermal energy management.

Icycomb
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Homework Statement


Which salt will make the best hot pack when combined with water?

Independent variable: Salt
Dependent variable: TemperatureIn the experiment I have a 50 ml beaker of water and I measure the initial temperature of the water. It was 24.5 degrees Celsius. I then add 10g of Sodium Chloride (table salt) to the same beaker. Now my question is will the temperature increase, decrease, or stay the same as the initial temperature of water.

I also did the same for two other salts: Ammonium Chloride and Calcium Chloride. The temperature of the water was 25 degrees Celsius for both of these salts. When I add the Ammonium Chloride and Calcium Chloride will the temperature stay the same, increase, or decrease?

Any help would be appreciated.
 
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Icycomb said:
In the experiment I have a 50 ml beaker of water and I measure the initial temperature of the water. It was 24.5 degrees Celsius. I then add 10g of Sodium Chloride (table salt) to the same beaker. Now my question is will the temperature increase, decrease, or stay the same as the initial temperature of water.

I don't understand the situation. You have measured initial temperature - it was 24.5 deg C. You have added salt. Next logical step is not asking the on the forums "what will happen", but measuring the temperature for the second time.

Ditto for the other two salts.
 

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