How do I test for the presence of Hydroxide Ions in a solution? I can only test

Question

How do I test for the presence of Hydroxide Ions in a solution? I can only test it using:
Solutions of halide salts Solutions of nitrate salts Solutions of carbonate salts Solutions if phosphate salts Solutions of sulfate salts How do I test for the presence of Hydroxide Ions in a solution? I can only test it using:
Solutions of halide salts Solutions of nitrate salts Solutions of carbonate salts Solutions if phosphate salts Solutions of sulfate salts
Solutions of halide salts Solutions of nitrate salts Solutions of carbonate salts Solutions if phosphate salts Solutions of sulfate salts

Explanation / Answer

You can use halid salts of ammonia. That means using solution of ammonium chloride you can detect hydroxide ions. Beacause ammonium chloride will react with hydroxide ions and releases ammonia. Which gives the smell of ammonia. The reaction involes is given below

NH4Cl + NaOH -> NH3 +NaCl + H2O

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