2.A. Which of the bases would be most suitable for making a buffer solution with pH 4.50? Explain your choice. (5 points)
BASE Kb Molar mass
1) NH3 1.8*10-5 17.03
2) C6H5NH2 4.0*10-10 92.12
3) H2NNH2 Z.0*10-6 32.05
4) C5H5N 1.7*10-9 79.10


Q. Describe how to prepare 1 L of this buffer solution with a total concentration of 0.1 mol/L. (10 points)

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