The question isn't exactly clear; it isn't clear that it is the greatest amount of acid per grams antacid or per mol antacid.
H^+ + OH^- ==> H2O
So the one with the largest OH per mol will neutralize the most acid. That is Al(OH)3. And you don't capitalize everything. It's MgO, Mg(OH)2, and Al(OH)3.
Some of the substance commonly used in stomach antiacid are MGO,MG(OH)2,AL(OH)3.
Which of these substance will neutralize thr greatest amount of 0.10M HCl per gram?
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