Which of these is not a good method for preparing a buffer? (HA is a weak acid)Single choice

A

Equal volumes of 1.0 M HA and 0.5 M NaOH.

B

Equal volumes of 0.5 M NH3 and 0.5 M NH4Cl.

C

Equal volumes of 0.5 M HA and 0.5 M NaA.

D

Equal volumes of 1.0 M HCl and 0.5 M NaA.

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