Chemistry
NULL
Medium
Question
Which set of solutes will form a buffer when dissolved in water to make 1 litter of solution ?
A
0.0002M HCl
B
0.2 mole of NaCl with 0.2 mole of HNO3
C
0.4 mole of CH3COOH with 0.4 mole of NaOH
D
0.4 mole of NH3 with 0.2 mole of HCl
✓ Official correct answer
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A
0.0002M HCl
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B
0.2 mole of NaCl with 0.2 mole of HNO3
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C
0.4 mole of CH3COOH with 0.4 mole of NaOH
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D
0.4 mole of NH3 with 0.2 mole of HCl
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Explanation
Mixing 0.4 mole of NH3 with 0.2 mole of HCl leaves 0.2 mole of unreacted NH3 (weak base) alongside 0.2 mole of NH4Cl (its conjugate acid salt), forming a buffer solution.
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