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Testing Ph For Acidity Essay

630 words - 3 pages

The nature of this acidic environment - by Christopher Mullins from Toongabbie Christian School

The world around us is composed of all acids and bases including the ones in air and water. As humans, we come into contacts with acids and bases each day. For example, vinegar, lemon juice and vitamin C are acids that are used everyday. Testing the pH is important at it determines whether the substance is a strong or weak acid/base. Indicators such as methyl orange, bromothymol blue and litmus are examples of indicators that are used to test the pH of swimming pools as acids from the human body and acid rain could change the pH in the pool. Also, they are used to test the pH of aquarium water and ensure that the pH doesn't exceed or fall below the pH ranges that fish can survive in. A typical fish can have better quality life in pH ranges between 7.0 and 8.0.

Acidic oxides

There are 3 acidic oxide gases that are present in the atmosphere:
Carbon dioxide (CO2)
Sulfur dioxide (SO2
Nitrogen dioxide (NO2)

Sources of carbon dioxide

Carbon dioxide is a gas which is part of the carbon cycle. The combustion of fossil fuels by humans has increased the concentration of CO2 by 30%. Carbon dioxide is created by living organisms such as plants and animals. The negative consequences of having more CO2 in the air is that it raises the temperature of the atmosphere (known as global warming) as carbon dioxide prevents heat from escaping the Earth's atmosphere. Before the industrial revolution, the concentration of CO2 was below 300 parts per million

C6H12O6 + 6O2 ------> 6CO2 + 6H2O

Sources of Sulfur dioxide

Approximately 70% of sulfur dioxide that is released into the atmosphere comes from natural sources such as volcanic eruptions. Approximately 30% of the sulfur dioxide comes from the burning of fossil fuels. For example, car exhausts. They are also produced by
SO2cigarettes

S + O2

...

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