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Water quality analyses were performed at different sites on a river shown on the map - HSC - SSCE Chemistry - Question 15 - 2005 - Paper 1
Question 15
Water quality analyses were performed at different sites on a river shown on the map. Map The table shows the results of the tests performed at the different sites... show full transcript
Worked Solution & Example Answer:Water quality analyses were performed at different sites on a river shown on the map - HSC - SSCE Chemistry - Question 15 - 2005 - Paper 1
Step 1
Step 2
Biochemical Oxygen Demand Analysis
Answer
At Site 1, the biochemical oxygen demand is 145 ppm, whereas Site 2 shows a much lower demand of 2 ppm. This suggests that Site 1 has higher organic pollution, consuming more oxygen, which can significantly impact water quality and aquatic ecosystems.
Step 3
pH Level Evaluation
Answer
The pH values are also noteworthy: Site 1 has a pH of 5.2, indicating a more acidic environment, while Site 2 has a pH of 6.9, which is closer to neutral. Acidic waters can affect fish and other aquatic organisms adversely, making Site 2 more favorable for aquatic life.