As a lab technician for a pharmaceutical comapny, you areresponsible for prepari

Question

As a lab technician for a pharmaceutical comapny, you areresponsible for preparing hot packs and cold packs. A hot packinvolves a release of heat when a salt and water are mixed. A coldpack becomes colder because mixing a salt and water absorbsheat. Which compound could you use to make a hot pack? Which compound could you use to make a cold pack? As a lab technician for a pharmaceutical comapny, you areresponsible for preparing hot packs and cold packs. A hot packinvolves a release of heat when a salt and water are mixed. A coldpack becomes colder because mixing a salt and water absorbsheat. Which compound could you use to make a hot pack? Which compound could you use to make a cold pack?

Explanation / Answer

To make the cold pack, you want a salt that mixes with water toabsorb heat. In this context, absorbing heat means an endothermicreaction takes place...an endothermic reaction takes place asfollows: A + B +heat -> C + D As you can see, heat is absorbed for the reaction to take place.Thus, for the cold pack, you want an endothermic reaction. You needa very soluble salt such as NaCl, which is very endothermic, atabout +3kJ/mol. To make the hot pack, you want an endothermic reaction. A + B -> C + D + Heat The reaction of the salt and water must be exothermic, releasingheat. Thus, you need a salt such as sodium acetate..which is lesssoluble and thus creates an endothermic reaction. Please rate, if you have any questions just ask. Good luck.

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