Application Exercise 6

1a. The combustion of coal produces SO2 and forms aerosol in the air which leads to poor visibility.

b. Natural rain has pH of 5 to 6. “Ten times more acidic” means that [H+] increases by 10 times. Every 10 times increase in [H+] leads to decrease in 1 pH value. The pH value at the National Park is 4 to 5.

2.
A. Reduce electricity usage and increase water vapour
B. Reduce co2 emission which can become acid when contact with water
C. Reduce electricty usage which usually use coal as power source which emit co2 to the air
D. Improve efficiency of the heater which can reduce the usage of electricity which usually use coal as power source which emit co2 to the air
E. Saving the energy which wasted from transporting non local food.

3a. Acids – HCl (hydrochloric acid), H2SO4 (sulfuric acid), CH3COOH (acetic acid), CHNO3 (Nitric acid), H3PO4 (Phosphric acid)

Bases – NaOH (sodium hydroxide), KOH (potassium hydroxide), NH3 (ammonia), Mg(OH)2 (magnesium hydroxide), Ba(OH)2 (barium hydroxide)

b. Acids turn litmus paper to red while bases turn litmus paper to blue.

4. Issues in Singapore: Acid rain causes the acidification of the stream and disappearance of species. The acid deposition mainly comes from industrial pollution and use of cars, which produces large amount of SO2 and NOx. SO2 from Indonesia due to burning of trees will increase the acid deposition level in Singapore.

 

Author: Thomas Chen

Life is a sum of all your choices!