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3. Which THREE of the following are most likely to contribute to the alkalinity (the base strength) of the bottle water samples? (Select THREE answers.) Potassium bicarbonate Sodium bicarbonate Calcium chloride Magnesium chloride Dipotassium phosphate (a.k.a., di-potassium monohydrogen phosphate) Magnesium sulfate Note: For the problems below, show all work. Write your final answers in the indicated spaces. 4. What is [H+](in M ) of stomach fluid with a pH of 1.6 ? (Use two sig figs for your answer.) 5. If the human stomach contains 75mL of fluid at a pH of 1.6, how many moles of H+are contained in the stomach? (Use two sig figs for your answer.)