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Question

Which of the following solution cannot act as a buffer?
  1. NaH2PO4+H3PO4
  2. CH3COOH+CH3COONa
  3. H3PO4+Na2HPO4
  4. HCl+NH4Cl

A
CH3COOH+CH3COONa
B
HCl+NH4Cl
C
H3PO4+Na2HPO4
D
NaH2PO4+H3PO4
Solution
Verified by Toppr

A mixture of weak acid and a salt of strong base, or a mixture of weak base and a salt of strong acid acts as a buffer.

NaH2PO4+H3PO4 ,CH3COOH+CH3COONa and H3PO4+Na2HPO4 have an acid/base pair.

Therefore they act as a buffer.

A mixture of strong acid and its salt of strong acid don't make an effective buffer.

Therefore, HCl+NH4Cl cannot act as a buffer.

Hence the correct option is C.

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Q1
The equivalent mass of H3PO4 and NaH2PO4 in the reaction are respectively :
2NaOH+H3PO4Na2HPO4+2H2O
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Q2
A one litre solution contains 0.04 M Na2HPO4 and 0.02 M NaH2PO4. The correct statement(s) is/are:
For H3PO4: pKa1=2.14 ; pKa2=6.84 ; pKa3=12.3 and use log2=0.3.

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Q3
The equivalent weight of NaH2PO4 in the following reaction is:
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Q4
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H3PO4+2NaOHNa2HPO4

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Q5
Assertion: On mixing equal volumes of 1 M HCl and of 2 M CH3COONa, an acidic buffer solution is formed.
Reason: The resultant mixture contains CH3COOH and CH3COONa which are parts of acidic buffer.
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