Chemistry

Which of the following combinations will make a good buffer solution?

0.05 M H2CO3 + 0.05 M KHCO3
0.5 M HI + 0.5 M CsI
0.3 M NH4Cl
0.3 M NH4Cl + 0.1 M NH3
0.3 M NH4Cl + 0.1 M HCl

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  1. You KNOW #1 and #3 are buffers.

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