The heartburn feeling occurs when the pH of the stomach is: Select one: a. Around 1 or lower. b. Between 2 and 3. c. At any pH lower than 7 because the stomach is acidic in that pH range. O d. Both answers (a) and (b). O e. Higher than 7. 40.00 ml of 0.1100 M HCl solution was added to a 0.490 g sample of an antacid. The back titration with 0.9500 standard NaOH solution consumed 12.31 ml to reach the end-point Calculate the effectiveness of the antacid Select one: 0.0884 molte 0.0084 molts 0.001 mol/g Dog