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Which one of the following aqueous solutions, when mixed with an equal volume of 0.10 mol...

Which one of the following aqueous solutions, when mixed with an equal volume of 0.10 mol L-1 aqueous NH3, will produce a buffer solution?

a. 0.20 mol L-1 NH4Cl

b. 0.10 mol L-1 CH3COOH    

c. 0.10 mol L-1 HCl

d. 0.20 mol L-1 HCl

e. 0.050 mol L-1 NaOH

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