Complete this page before lab and turn in at the beginning of recitation. Read t
ID: 961653 • Letter: C
Question
Complete this page before lab and turn in at the beginning of recitation. Read through the Introduction and Experimental Methods of Laboratory 12: Antacid Analysis to answer the following questions. For each of the following food types, list where digestion is initiated and what enzymes are used to hydrolyze them. Carbohydrates: Proteins: Lipids: How does the pH of the stomach change when eating versus not eating? In two or three complete sentences, describe what heartburn is and how antacids work to chemically counteract heartburn. Read over procedure Part B and briefly describe what a titration is and how you will be conducting your titration in this experiment (i.e., what indicator, acid, and base will be used and what color/pH change will be observed for the endpoint). 13.5 mL of 0.10 M NaOH was required to reach the equivalence point while titrating a flask of HC1. How many moles of HC1 was present in the flask?Explanation / Answer
1. Digestion of food
a. Carbohydrates : Digestion occurs in mouth as we chew the food, and the enzyme working is amylase. It completes in small intestine with enzymes sucrase, maltase and lactase.
b. Proteins : Digestion begins in the stomach with pepsin, renin and gelatinase enxymes. The final digestion of proteins is completed in small intestine by trypsin and chymotrypsin enzymes.
c. Lipids : the digestion of lipids occur in small intenstine with lipase enzyme.
2. pH os atomach is between 1-3 when empty that is not eating condition. When we ingest food, the acid in the stomach gets diluted and the pH changes to around 5. this is when the food is getting digested in the stomach by various enzymes working under acidic medium.
3. Heartburn is caused by an increase in acidity of stomach acid in the body which causes the discomfort. Taking antacids which are basic carbonate or hydroxide salts of Ca and or Mg reacts with the acid in stomahc and brings down the pH to normal condition and treat hearburn.
4. Titration of antacid tablet is perfomred to determine the exact amount of active salt present in it. First antacid is mixed with a known volume of HCl where, antacid reacts with HCl to form chloride salts of metals. The excess acid is then back titrated with NaOH in presence of methyl red indicator (red in acidic and yellow in basic medium). The end point is detected by dissapperarence of red coloration of the solution.
5. moles of NaOH = moles of HCl present
moles of HCl = 0.1 M x 13.5 ml = 1.35 mmol present in the flask
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