$(a)$ What is a universal indicator?
$(b)$ Write the chemical equation involved in the preparation of sodium hydroxide. Name the process.
$(b)$ Write the chemical equation involved in the preparation of sodium hydroxide. Name the process.
(N/A) universal indicator is a mixture of several indicators that exhibits different colours at different concentrations of hydrogen ions in a solution,allowing for the determination of the $pH$ value.
$(b)$ The process is known as the Chlor-alkali process. The chemical equation is: $2NaCl(aq) + 2H_2O(l) \rightarrow 2NaOH(aq) + Cl_2(g) + H_2(g)$.
$(b)$ The process is known as the Chlor-alkali process. The chemical equation is: $2NaCl(aq) + 2H_2O(l) \rightarrow 2NaOH(aq) + Cl_2(g) + H_2(g)$.
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