Final answer:
The value of Kb for the conjugate base of formic acid is 5.56 x 10^-11
Step-by-step explanation:
The value of Ka for formic acid, CH2COOH, is 1.80×10-4. To determine the value of Kb for its conjugate base, HCOO-, we can use the equation:
Ka x Kb = 1.0 x 10-14
Solving for Kb, we find that Kb = 5.56 x 10-11.