Which of the following is basic buffer?
Correct answer: A. NH4OH/NH4Cl
- A. NH4OH/NH4Cl
- B. NaOH/NaCl
- C. NaOH/HCl
- D. H2CO3/NaHCO3
Explanation
A basic buffer needs a weak base together with the salt of that base, and ammonium hydroxide with ammonium chloride is the standard example, holding the pH around 9. Carbonic acid with sodium hydrogen carbonate is also a buffer but an acidic one, built from a weak acid and its salt. Sodium hydroxide is a strong base and is fully ionised, so it has no reservoir of un-ionised base and cannot buffer.
This question appeared on the UHS MDCAT 2025 paper, which you can sit online with every answer explained.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
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 pH of a buffer solution made from a weak acid and its salt depends on
Which mixture would act as an acidic buffer?
A buffer solution is one that
What happens when H+ is added to ammonium hydroxide and ammonium chloride buffer?
The Substance which resist in change in PH is called?
Alkaline PH scale starts from?