Digel (R) is an antacid whose active ingredients are solid aluminum hydroxide an

Question

Digel (R) is an antacid whose active ingredients are solid aluminum hydroxide and solid magnesium hydroxide Stomach acid is primarily an aqueous solution of 0.12 M hydrochloric acid. How many mL of stomach acid will be neutralized by the magnesium hydroxide in two 1.25 gram tablet of Digel, assuming that the tablets are 74% magnesium hydroxide? for full credit including a labeled a balanced chemical equation. No Chit! Your neat and organized work must be submitted on an 8.5 inch times11 in sheet of white paper. Work submitted on any other size or color will not be scored!

Explanation / Answer

The data

molarity of stomach acid = 0.12 M

Mass of two tablets = 2 x1.25 g = 2.5 g

mass of magnesium hydrosxide in 2 tablets = 2.5 g x 74/100

= 1.85 g

Now for neutralization

equivalents of acid = equivalents of base

0.12 x v(mL ) = 1.85 x103 /(58/2) equivalent mass of Mg(OH)2 = molar mass /2 = 58/2

Thus V = 531.6 mL

Thus the volume of 0.12M stomach acid that can be neutralised by two 1.25g tablets(containing 74% Mg(OH)2] is

531.6 mL

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