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When neutralising an acid to an alkali , both of which are clear liquids, you do not see always see the product; it may appear to be another clear liquid.

e.g. Hydrochloric Acid and Sodium Hydroxide, which are clear liquids produce water a clear liquid and sodium and chloride ions which are not visible.

HCl(aq) + NaOH(aq) = H2O(l) + Na^+(aq) + Cl^-(aq)

What you can see, if an indicator is used, is the change of colour of the indicator.

However, a rusting nail (iron) is visible, but it takes days for the appearance to change, from shiny metal to red/brown of rust.

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lenpollock

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1y ago

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