# Chem Lab

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Can the NH3/NH4Cl system be sued to prepare a buffer of a pH 9.5? why or why not? Can it prepare a buffer of pH 5? There were two buffers, 0.2 M and 0.1M.

• Chem Lab -

I don't know how we can sue the NH3/NH4Cl system; however, the pKa for NH3 is 9.25 and that is within the range. What about the two buffers of 0.2M and 0.1M?

• Chem Lab -

Thank you, it should say 'used' not 'sued'.

• Chem Lab -

9.5 yes.
5 no.

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