From the homework given on Friday, there was a question about combustion. This means that oxygen gas (O2) is involved as a reactant in the chemical reaction.
The class then did an experiment to determine which cations ions were soluble or insoluble with certain anions. Half of the class did set A and the other half of the class did set B. Somehow the solutions containing (Na+), (K+), and (Cl-) were contaminated. These ions don't form precipitates :((
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