Yas_abx
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calcium carbonate, caco3, is used in indigestion tablets as it reacts with and neutralises stomach acids. the equation for the reaction between caco3 and dilute hydrochloric acid is shown below... h2om and so the active constituent is the carbonate dianion, co32, with ca2+being an inert counter caco3(aa) 2hci(aa) → cacl2(aq) co2tg) + + + ion... some tablets also contain magnesium hydroxide, which acts in a similar way... ...and so the active constituent is the hydroxide anion, with mg being an inert counter in... the pepcid two brand (manufactured by mcneil) contains 0.369 g of co32 and 0.0962 g of ho in each tablet.
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