Which of the following combinations can result in the formation of a buffer?
a) 90 mL of 0.10 M HCN with 70 mL of 0.10 M NH3.
b) 70 mL of 0.10 M HC2H3O2 with 30.0 mL of 0.15 M Ba(OH)2.
c) 50 mL of 0.10 M HNO3 with 50 mL of 0.10 M NaOH.
d) 70 mL of 0.10 M HNO2 with 25 mL of 0.10 M LiH.
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