Reaction of the blood to changes in acidity content The pH in the blood can vary
ID: 987639 • Letter: R
Question
Reaction of the blood to changes in acidity content The pH in the blood can vary due to respiration, which controls the amount of CO_2 present in the blood, but it can also vary due to digestion and metabolism. Effect of metabolism: Digesting food can release acids or bases into the blood. Calculate the pH of the blood if 2.00 multiple 10^-5 mol-L of strong acid (AH) is released in the blood through digestion. Calculate the pH of the blood if 2.00 multiple 10^-5 mol/L of strong base (A) is released in the blood through digestion. Is blood more resistant towards acids or bases?Explanation / Answer
8. [H+] = 2.00 x10-5 mol/lit
pH = - log [H+] = - log [2.00 x10-5] = -log2+5log10 = 5-0.3010 = 4.699
9. [OH-] = 2.00 x10-5 mol/lit
pOH = - log [OH-] = - log [2.00 x10-5] = -log2+5log10 = 5-0.3010 = 4.699
pH = 14 – pOH = 14-4.699 = 9.301
10. Blood does not resistant towards acids or bases. Blood contains large amounts of carbonic acid, a weak acid, and bicarbonate, a base. Together they help maintain the bloods pH at 7.4. If blood pH falls below 6.8 or rises above 7.8, one can become sick or die. The bicarbonate neutralizes excess acids in the blood while the carbonic acid neutralizes excess bases. Another example is when we consume antacids or milk of magnesia. After eating a meal with rich foods such as sea food, the stomach has to produce gastric acid to digest the food. Some of the acid can splash up the lower end of the esophagus causing a burning sensation. To relieve this burning, one would take an antacid, which when dissolved the bases buffer the excess acid by binding to them.
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