1) Below are some common foods and their pH values. Which ones are most likely t
ID: 782315 • Letter: 1
Question
1) Below are some common foods and their pH values. Which ones are most likely to cause "heartburn"? Explain why 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 NET EQUATION for the reaction of the antacid containing the anion carbonate, CO 2/3-, or the anion bicarbonate, HCO3-, with acid (H+).
4) Write the net ionic equation for the neutralization of the bases, magnesium hydroxide, Mg(OH)2 and aluminum hydroxide, Al(OH)3, found in Maalox, for example, with acid (H+).
Explanation / Answer
1. lemon juice.. because the main cause of heartburn is irritation of the lower esophagus due to stomach acid
And since Lemon juice has lower pH and acidic in nature, so it is most likely to cause heartburn.
2. Back titration is the process of determining the conc. of an analyte by reacting it with a kmown number of moles of excess reagent.
The excess reagent is then titrated with another reagent
The concentration of the analyte in the original solution is then related with the amount of reagent consumed.
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