Antacid tablets contain a variety of bases, such as NaHCO_3, MgCO_3, CaCOa_3, an

Question

Antacid tablets contain a variety of bases, such as NaHCO_3, MgCO_3, CaCOa_3, and Mg(OH)_2. Only NaHCO_3 has appreciable solubility In water. Answer parts a & h below: a. Write a net ionic equation for the reaction of each antacid with aqueous HCI, including physical states. NaHCO_3 net ionic reaction: MgCO_3 net ionic reaction: MgCO_3 net ionic reaction: CaCO_3 net ionic reaction: Mg(OH)_z net ionic reaction: b. choose the best answer to explain how insoluble substances can act as effective antacids. A small portion of the solid dissolves and neutralizes the acid Even as a solid, the antacid will read with H^+ to neutralize the acid The volume of the solid decreases the acid concentration, causing the pH to raise

Explanation / Answer

NaHCO3

NaHCO3(aq) + HCl(aq) = NaCl(q) + H2O(l) + CO2(g)

net ionic:

2H+(aq) + CO3-2(aq) --> H2O(l) + CO2(g)

MgCO3

MgCO3(s) + 2HCl(aq) = MgCl2(aq) + H2O(l) + CO2(g)

net ionic

CO3-2(aq) + 2H+(aq) --> H2O(l) + CO2(g)

CaCO3

CaCO3(s) + 2HCl(aq) = CaCl2(aq) + H2O(l) + CO2(g)

net ionic

CO3-2(aq) + 2H+(aq) --> H2O(l) + CO2(g)

d)

Mg(OH)2(aq) + 2HCl(aq) = 2H2O(l) + MgCl2(aq)

2OH-(aq) + 2H+(aq) = 2H2O(l)

Q2

small portion of solid dissovles and neutralizes acid

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