The Analysis Label on a 500 ML Bottle of Fiji

Multiple Choice

The analysis label on a 500 mL bottle of Fiji natural artesian water reports pH = 7.5 and 140 mg of bicarbonates, HCO₃^-. Calculate the pH expected as a result of the bicarbonates to see if these two numbers are consistent with each other. (K_b = 2.4 * 10^-8 for HCO₃^-)

A) 7.5
B) 5.0
C) 9.6
D) 4.4
E) 9.0