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Qualitative Analysis · Part 2 of 2
6 exam-style questions with model answers, plus 8 quick multi-choice questions — every question on this part of the standard, grouped by the 2 pages of notes they come from.
Write a full answer before you reveal the model one. That comparison is where the learning happens.
A student identifies nitrate ions in a water sample taken from a drain in a dairy farming area. Describe the significance of this species for people and the environment.
Explain the significance of identifying lead ions, Pb2+, in water collected from a roof-fed water tank on an older house.
A student identifies both Ca2+ and SO42− in a water sample from a bore in a limestone region. Discuss the significance of these species, considering more than one perspective.
A sample is found to contain Fe3+ and SO42−. State the formula and name of the compound present, and explain how you determined the formula.
Explain why recording negative results is important in a qualitative analysis report, using an example.
A student's report identifies Cu2+ and Cl− correctly and includes all the required equations, but the marker awards Merit rather than Excellence. Justify what is most likely missing, and explain what the student should have written.