Question

Give one test that can be used to detect the presence of ions produced.

Answer 1

As we know that an ion is a particle, atom or molecule with a net electrical charge. The charge of the electron is considered negative by convention. We know that the negative charge of an ion is equal and opposite to the charged proton considered positive by convention. For the detection of the ions we use the scientific acidic or basic tests.

Complete step by step answer:
We can test for positive ions by adding sodium hydroxide solution and noting the colour of the precipitate. As we know that ammonium ions give off ammonia gas when we heat them with sodium hydroxide solution.
Some metal ions also give coloured lights when we heat them in a Bunsen flame. The flame colour produced indicates which alkali metal ion is present in the compound. There are positive ions and negative ions. Some examples of positive ions are $A{l^{^{ + 3}}},B{a^{ + 2}},C{a^{ + 2}}$ …etc while some examples of negative ions are $B{r^ - },C{l^ - },{N^{3 - }}$and many more.
So Litmus paper or indicators can be used to detect the presence of ions in the solution which results as: Red litmus turns blue and Phenolphthalein turns colourless.
Hence to test the presence of ions produced we can use the red litmus paper test which turns blue, methyl orange or yellow.

Note: We know that ions in solution are called electrolytes. All soluble ionic compounds are strong electrolytes. If we have to find the ionic charge of the element we need to see the Periodic table. On the left side of the periodic table we can see the metals which are positive and in the right side are negative.