Buffer solutions containing Na2CO3 and NaHCO3 range in pH from 10.0 to 11.0. The chemical equation below represents the equilibrium between CO32−and H2O, and the table lists the composition of four different buffer solutions at 25°C.CO32−(aq)+H2O(l)⇄HCO3−(aq)+OH−(aq)Kb=2.1×10−4at25°CWhich of the following mathematical expressions can be used to determine the approximate pH of buffer 1 ?ApH=−log(2.1×10−4)+log(0.1000.150)=3.50BpH=−log(2.1×10−4)+log(0.1500.100)=3.85CpH=[14.00+log(2.1×10−4)]+log(0.1000.150)=10.15DpH=[14.00+log(2.1×10−4)]+log(0.1500.100)=10.50

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