Which of the following is called 'Pearl ash"?

1. Na₂CO3

2. NaHCO3

3. K₂CO

4. CaCO3

Which of the following couples are buffer systems?

(a) KF/HF(b) KBr/HBr(c) Na₂CO₃/NaHCO₃

Which of the 5 common active ingredients (Mg(OH)2, Al(OH)3, NaHCO3,CaCO3, MgCO3) is the most effective, by mass, at neutralizingexcess stomach acid? Show calculations to prove your answer.

(*I think it's Al(OH)3 because that would neutralize 3 moles ofHCl. I'm not sure how to prove it though.*)