Explain why a buffer can be prepared from a mixture of NH4CL and NaOH but not from NH3 and NaOH .

For a buffer, you need a weak acid and its conjugate base, or a weak base and its conjugate acid. When you mix NH4Cl (which is slightly acidic) with NaOH, you form NH4OH, which is basic. This gives you the acid/base mixture you need for a buffer.

NH3 and NaOH, on the other hand, are both bases, so you won't have the acid required to form a buffer system.

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