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Q.

Which of the following will produce a buffer solution when mixed in equal volumes?

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a

0.1mol dm3NH4OH and 0.1mol dm3HCl

b

0.05mol dm3NH4OH and 0.1mol dm3HCl

c

0.1mol dm3NH4OH and 0.05mol dm3HCl

d

0.1mol dm3 CH3COONa and 0.1mol dm3 NaOH

answer is C.

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Detailed Solution

When the concentration of NH4OH (weak base) is higher than the strong acid (HCl), a mixture of weak base and its conjugate acid is obtained, which acts as basic  buffer.

                 NH4OH+HClNH4Cl+H2O

 Initially      0.1 M       0.05 M       0

After reaction 0.05 M   0           0.05 M

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Which of the following will produce a buffer solution when mixed in equal volumes?