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Calcium carbonate can be used as an antacid to treat excess stomach acidity. What type of substance is calcium carbonate?

a. base

b. reducing agent

c. acid

d. buffer

1 answer

As an antacid it is acting as a base (A Bronsted-Lowry base).
CO3^2- + 2H^+ ==> H2CO3 ==> CO2 + H2O

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