Question

how is the concentration of of hydronium icons (H3o) affected when a solution of an acid is diluted
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Answer 1

When the solution of acid is diluted then the concentration of hydronium ions decreases. This happens because acid gets diluted which reduces it's H+ ions concentration per unit volume.

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Answer 2

HEY FRIEND
HERE IS YR ANS
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The concentration of hydronium ions decreases when an acid is diluted because on adding water the H+ ions of the acid and hydroxyl ions of water react to form water molecules and the concentration of hydronium ions decreases.

Eg....
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H+ + H2O →H3O+

H+ + OH- →H2O

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