for which of the solutions of weak bases listed below is the x is small approximation most likely to work when finding the poh of the solutions?
0.010 MCO_3^-, K_b = 1.8 times 10^-4
1.0 M HCO_3^-, K_b = 2.3 times 10^-8
0.00010 M HCO_3, K_b = 2.3 times 10^-8
0.0010 M C_2 H_5 NH_2, K_b = 5.6 times 10^-4
a. 0.0010 M C_2 H_5 NH_2, K_b = 5.6 times 10^-4
b. 0.010 MCO_3^-, K_b = 1.8 times 10^-4
c. 1.0 M HCO_3^-, K_b = 2.3 times 10^-8
d. 0.00010 M HCO_3, K_b = 2.3 times 10^-8
