Mass Naa de) ) 116) Postlab Questions Q1. Many d kits include an instant cold pa
ID: 1046118 • Letter: M
Question
Mass Naa de) ) 116) Postlab Questions Q1. Many d kits include an instant cold pack. A cold pack utlizes a chemical reaction that has a of reaction, an endothermic reaction or an exothermic reaction, would be most useful for making a cold pack An E mment on hone HCI is a strong acid, and NaOH is a strong base. Neither substance should be poured down the drain because two substances, why do you think it was okay to pour the contents of the reaction mixture down the sink? Q2 they are corrosive. Considering the chemical equation for the reaction between these Discuss whether aspirin in the form of a tablet or a powder would be more effective at quickly relieving a headache. Support your answer, if possible, using experimental evidence. adb data sbeet: 10 pts Page 3 of 3Explanation / Answer
1) A cold pack contains a salt, usually ammonium nitrate or urea in a sealed bag of water. When squeezed, the salt is released and dissolves in water. The dissolution of ammonium nitrate in water is an endothermic reaction. Cold packs usually function by absorbing heat from the surroundings (hence the surroundings feel cooler). An endothermic reaction absorbs heat; hence, a cold pack employs an endothermic reaction to exhibits its function.
2) HCl, a strong acid and NaOH, a strong base are corrosive. HCl and NaOH react to form a neutral salt, sodium chloride, NaCl and water, H2O. Both are neutral substances having pH = 7.00 (close to the pH of blood) and hence, neither NaCl nor H2O can any adverse effect on skin. Hence, it is always advised to dispose off HCl or NaOH by neutralizing with the acidic/basic counterpart to attain a neutral pH and then pour the products of the reaction down the sink in presence of running water.