9. Activity - Neutralisation reaction

Question:

4 m.

Answer the following questions:

Janani adds a few drops of phenolphthalein to a solution of sodium hydroxide. The solution turns pink. Dilute hydrochloric acid is then added drop by drop while stirring. After some time, the pink colour disappears.

1. What does the disappearance of the pink colour indicate?

It indicates that the base dissolved in water
It indicates that the base strength has been increased
It indicates that the base has been neutralised by the acid
It indicates that the base has disappeared

2. Write the balanced chemical equation for the reaction.

\(HCl + NaOH \to NaCl + H_2\)
\(HCl + NaOH \to NaCl_2 + H_2O\)
\(HCl + NaOH \to NaCl + H_2O\)
\(HCl + NaOH \to Na_2Cl + H_2O\)

3. Write the ionic equation for the formation of water during the neutralisation reaction.

\(H^- + OH^- → H_2O\)
\(H^+ + OH^- → H_2O\)
\(H_2^+ + 2OH^- → H_2O\)
\(H_2^+ + OH^- → H_2O\)

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