The main buffer system of the human blood is____________?
Correct answer: A. H2CO3 - HCO3
- A. H2CO3 - HCO3
- B. H2CO3 - CO32-
- C. CH3COOH - CH3COO-
- D. NH2CONH2 - NH2CONH+
Explanation
The principal blood buffer is the carbonic acid-bicarbonate pair, H2CO3 and HCO3-. It resists changes in blood pH because H2CO3 can donate H+ while HCO3- can accept H+, so option a is correct. Students may choose H2CO3-CO3 2- because both are carbonate species, but carbonate is not the main blood buffer pair.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Buffer Solutions
Buffer solutions resist changes in pH when small amounts of acid or base are added, using a weak acid and its conjugate base or a weak base and its conjugate acid. Work includes buffer action, the common-ion effect, Henderson-Hasselbalch calculations, buffer capacity, and the difference between acidic and basic buffers.
Practise Chemical Equilibrium
625 free Chemical Equilibrium MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Buffer Solutions questions
The best indicator for titrating HCl with NH4OH is: _________?
At what digit of PH scale PH is neutral?
The range of acid PH on PH scale is____________?
When 0.01 moles of NaOH are added to a buffer solution, its PH changes from 4.745 to 4.832. What is its?
The PH of Tears is __________?
Ka<10-3 means______________?