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11 April, 15:31

Many homeowners treat their lawns with CaCO3 (s) to reduce the acidity of the soil. Write a net ionic equation for the reaction of CaCO3 (s) With a strong acid.

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  1. 11 April, 15:55
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    The reaction of acid, assuming HCl and calcium carbonate always produces a gas. The reaction is as follows:

    2 HCl + CaCO3 - - > CaCl2 + H2CO3

    H2CO3, carbonic acid, is a weak acid that is unstable in water solutions at high concentrations. As such, it decomposes:

    H2CO3 - - > H2O + CO2

    Then,

    2 HCl + CaCO3 - - > CaCl2 + H2O + CO2

    The total ionic equation looks as follows:

    2H + (aq) + 2 Cl - (aq) + CaCO3 (s) - - > Ca+2 (aq) + 2 Cl - (aq) + H2O (l) + CO2 (g)

    Clearly, Cl - is a spectator ion as it is unchanged in the reaction. The net ionic reaction looks as follows:

    2 H + (aq) + CaCO3 (s) - - > Ca+2 (aq) + H2O (l) + CO2 (g)
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