Question

1) Below are some common foods and their pHvalues. Which ones are most likely to cause "heartburn"? Explainwhy you made those choices.

soda, 2.0-4.0; lemon juice,2.00- 2.60; tofu, 7.20; tomatoes,4.0-4.4; cow's milk, 6.40- 6.80;tea, 7.20; black coffee, 5.0-5.1; cooked white rice, 6.00- 6.70

2) Explain the technique of back- tiltration.

3) Some antacids will generate carbon dioxide,CO2, when they neutralize the acid in gastric juice. Write the NETEQUATION for the reaction of the antacid containing the anioncarbonate, CO 2/3-, or the anion bicarbonate, HCO3-, with acid(H+).

4) Write the net ionic equation for the neutralization of thebases, magnesium hydroxide, Mg(OH)2 and aluminum hydroxide,Al(OH)3, found in Maalox, for example, with acid (H+).