Why a tablet of antacid contain a small amount of solid acid

(i)Why a tablet of antacid contain a small amount of solid acid?

Antacid is to lower the acidity of HCl in our stomach but why we add some solid acid into the antacid? Wouldn't it deteriorate the situation?

(ii)usually, it contains a solid metal carbonate/metal hygrogencarbonate. These kind of substances are alkaline but they are not alkali. Why these substances are alkaline without being a alkali?

Update:

補充第2個問題,我的意思即是說,為什麼 metal carbonate/metal hygrogencarbonate不是鹼但是仍會帶鹼性呢?

1 Answer

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  • ?
    Lv 7
    1 decade ago
    Best Answer

    i) if it contains only metal carbonate or bicarbonate, it will be harmful

    to our mouth and oesophagus. so a small amount of solid acid is

    mixed with them to make it less alkaline.

    ii) the pH of alkali is too high, so it will damage our body.

    the pH ot alkaline is lower than the alkali, such as CaO or

    MgO. so we use metal carbonate or bicarbonate instead.

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