Year 12 Chemistry
Abstract: Cold packs are based on the principle of endothermic reactions, which means a reaction that absorbs heat from the surrounding resulting in a temperature drop. Due to this temperature drop, cold packs have many benefits when it comes to injuries such as sprains and strains. It cools the local tissue and reduces bleeding, swelling and pain. It also aids in a speedy recovery. The most commonly used chemical in instant cold packs is ammonium nitrate which will be tested in the investigation along with four other chemicals in water. These other chemicals include potassium nitrate, potassium chloride, sodium acetate and sodium chloride. The …show more content…
Calculations to find the weight of 0.05 moles of each chemical.
Calculating amounts of Ammonium Nitrate and Potassium Nitrate for the various ratios.
1:1 = 0.05 molar concentration of Ammonium Nitrate: 0.05 molar concentrate of Potassium Nitrate 4 grams of NH4NO3: 5.05 grams of KNO3
3:1 = 0.075 molar concentration of Ammonium Nitrate: 0.025 molar concentration of Potassium Nitrate 6 grams of NH4NO3: 2.5 grams of KNO3
1:3 = 0.025 molar concentration of Ammonium Nitrate: 0.075 molar concentration of Potassium Nitrate 2 grams