The best method for determining whether an element is present in that solution would be to look for precipitate-forming reactions.
What is precipitate forming reaction?
In a precipitation reaction, dissolved chemicals combine to create one or more solid products. These kinds of reactions, which are also known as double displacement, double replacement, or metathesis reactions, frequently take place in aqueous solutions and involve the exchange of ions between ionic compounds.
The presence of a specific element in a solution can be checked via precipitation reactions. The presence of lead in water sources could be checked by adding the chemical and watching for the appearance of a precipitate if, for instance, a chemical combines with lead to generate a precipitate.
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