The conclusion that is consistent with the ionic equation would be that COS (s) is a precipitate.
What is a precipitation reaction?
It is a reaction in which 2 soluble salts in aqueous forms react to produce an insoluble salt as one of the reaction's products.
Precipitate products are usually insoluble and can be filtered off using suitable filter paper. In other words, they are solids that are suspended in solution.
Following the ionic reaction, the two reacting ions are in aqueous forms while the product formed is solid.
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