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An indicator is placed in water - HSC - SSCE Chemistry - Question 25 - 2013 - Paper 1

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An indicator is placed in water. The resulting solution contains the green ion, Ind<sup>-</sup>, and the red molecule, HInd.<br><br>Explain why this solution can be ... show full transcript

Worked Solution & Example Answer:An indicator is placed in water - HSC - SSCE Chemistry - Question 25 - 2013 - Paper 1

Step 1

Include a suitable chemical equation that uses Ind<sup>-</sup> and HInd.

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Answer

The relevant chemical equation demonstrating the equilibrium between the indicator forms is:

HInd(aq)+H2O(l)⇌Ind−(aq)+H3O+(aq)HInd(aq) + H_2O(l) \rightleftharpoons Ind^-(aq) + H_3O^+(aq)

This equation showcases the transition between the red HInd and the green Ind<sup>-</sup> ion depending on the pH of the solution.

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