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A sample of river water taken from point X is analysed - HSC - SSCE Chemistry - Question 15 - 2015 - Paper 1
Question 15
A sample of river water taken from point X is analysed. Which row of the table shows the most likely results? Results of water analysis at X | Turbidity (NTU) | B... show full transcript
Worked Solution & Example Answer:A sample of river water taken from point X is analysed - HSC - SSCE Chemistry - Question 15 - 2015 - Paper 1
Step 1
Evaluate water characteristics
Answer
To determine the most likely results for water analysis at point X, we need to consider common water characteristics based on the surrounding environment, which includes farmland, a river, and a forest. These areas typically contribute to high turbidity and BOD levels due to runoff and organic matter.
- Turbidity: A high turbidity level (e.g., 400 NTU) indicates a lot of suspended solids, which aligns with the potential runoff from farmland.
- BOD (Biochemical Oxygen Demand): A higher BOD value (e.g., 18 ppm) suggests the presence of organic materials, again consistent with agricultural runoff.
- pH: The pH value around 6.5 is generally acceptable for natural water environments.
- Total dissolved solids: This can vary, but high levels can also occur due to runoff and dissolved materials in the water.
Therefore, analysis of the options shows that option (A) likely reflects the state of the water from point X.