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Which can act as buffer? 1) NH4OH+NAOH 2) HCOOH+CH3COONa 3) 40ml 0.1M NaCN+20ml of 0.1 M HCl 4) none of them …I think both 2 and 3 can act as buffers but correct answer is 3…plz explain.?
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Which can act as buffer? 1) NH4OH+NAOH 2) HCOOH+CH3COONa 3) 40ml 0.1M ...
Buffers are solutions that resist changes in pH when small amounts of acid or base are added to them. They consist of a weak acid and its conjugate base or a weak base and its conjugate acid. The key components of a buffer system are the weak acid-base pair that can donate or accept protons to maintain the pH of the solution.

Let's analyze the given options to determine which can act as a buffer:

1) NH4OH (ammonium hydroxide) and NaOH (sodium hydroxide):
- NH4OH is a weak base, and NaOH is a strong base.
- Since NH4OH is a weak base, it can act as a buffer when combined with its conjugate acid, NH4+.
- However, NaOH is a strong base and does not have a conjugate acid to form a buffer system.
- Therefore, this option cannot act as a buffer.

2) HCOOH (formic acid) and CH3COONa (sodium acetate):
- HCOOH is a weak acid, and CH3COONa is the salt of a weak acid (acetic acid).
- Both HCOOH and CH3COONa can form a buffer system.
- HCOOH can donate protons, and CH3COO- can accept protons, maintaining the pH of the solution.
- Therefore, this option can act as a buffer.

3) 40ml 0.1M NaCN and 20ml of 0.1 M HCl:
- NaCN is the salt of a weak acid (hydrocyanic acid).
- HCl is a strong acid.
- The addition of a strong acid (HCl) to the salt of a weak acid (NaCN) can disrupt the buffer system.
- The strong acid will protonate the weak base (CN-) and shift the equilibrium towards the formation of the weak acid (HCN).
- Therefore, this option cannot act as a buffer.

4) None of them:
- This option is correct since only option 2 (HCOOH and CH3COONa) can act as a buffer.

In conclusion, option 2 (HCOOH and CH3COONa) can act as a buffer system because it consists of a weak acid (HCOOH) and its conjugate base (CH3COO-). Option 3 (40ml 0.1M NaCN and 20ml of 0.1 M HCl) cannot act as a buffer because the addition of a strong acid disrupts the buffer system.
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Which can act as buffer? 1) NH4OH+NAOH 2) HCOOH+CH3COONa 3) 40ml 0.1M NaCN+20ml of 0.1 M HCl 4) none of them …I think both 2 and 3 can act as buffers but correct answer is 3…plz explain.?
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Which can act as buffer? 1) NH4OH+NAOH 2) HCOOH+CH3COONa 3) 40ml 0.1M NaCN+20ml of 0.1 M HCl 4) none of them …I think both 2 and 3 can act as buffers but correct answer is 3…plz explain.? for Class 11 2024 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about Which can act as buffer? 1) NH4OH+NAOH 2) HCOOH+CH3COONa 3) 40ml 0.1M NaCN+20ml of 0.1 M HCl 4) none of them …I think both 2 and 3 can act as buffers but correct answer is 3…plz explain.? covers all topics & solutions for Class 11 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which can act as buffer? 1) NH4OH+NAOH 2) HCOOH+CH3COONa 3) 40ml 0.1M NaCN+20ml of 0.1 M HCl 4) none of them …I think both 2 and 3 can act as buffers but correct answer is 3…plz explain.?.
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