Magnesium hydroxide, Mg(OH)_2 is another active ingredient of some antacids. How

Question

Magnesium hydroxide, Mg(OH)_2 is another active ingredient of some antacids. How does Mg(OH)_2 work to relieve the pain caused by excess stomach acid? Write the equation for this acid/base neutralization reaction. An antacid tablet was dissolved in 26.00mL of 0.650M HCI. The excess acid was back-titrated with exactly 11.34mL of 1.05M NaOH. The average weight of a tablet is 0.834g. The tablet came from a bottle of 150 tablets that cost $3.99. Calculate the moles of HCI neutralized by the tablet. Calculate the mass effectiveness of the antacid. c) Calculate the cost effectiveness of the antacid.

Explanation / Answer

Q4.

Mg(OH)2 is a base, will help to reduce acidity in the stomach

the stomach is mainly HCl (hydrochloric acid) therefore

Mg(OH)2(aq) + 2HCl(aq) --> 2H2O(l) + MgCl2(aq)

As seen, more water is produced, per mol

MgCl2 is not that acidic as HCl, therefore pH must increase for the stomach

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