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.
Last updated
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.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
A buffer solution containing H2CO3 and NaHCO3 is to be prepared to maintain a pH of 7.00. What must be the ratio NaHCO3 in order to realize such a pH if Ka of carbonic HCO3 acid is 4.3 x 10^7?
A buffer solution is one that
A solution has pH = 0 its H+ ion concentration is__________________?
Addition of CH3COOH and CH3COONa gives in water_______________?
Alkaline PH scale starts from?