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Fill in the blank: _______ are species that are not involved in the chemistry of solution...

Fill in the blank:

_______ are species that are not involved in the chemistry of solution phase reactions.

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Ans. Spectator ions are species that are not involved in the chemistry of solution phase reaction.

Consider an aqueous phase reaction between NaOH and HCl. The OH- from NaOH reacts with H+ from HCl to form H2O. However, the Na+ and Cl- do not participate any chemical reaction in the solution phase.

            NaOH(aq) + HCl(aq) ---------> H2O(l) + NaCl(aq)

            Net reaction: OH-(aq) + H+(aq) ---------> H2O(aq)

Such ions, though present in the solution phase, that don’t participate any chemical reaction, are called spectator ions.

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