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Ka and Kb

Q. Calculate the pH of a 0.081 M NaF solution. (Ka for HF = 7.01 x 10-4)

Solved • May 1, 2020

Ka and Kb

Q. Determine the Kb of a weak base if a 0.541 M aqueous solution of the base at 25 deg C has a pH of 10.88. Enter your answer in scientific notation.

Solved • May 1, 2020

Ka and Kb

Q. Consider the following substances: C6H5NH2 (a weak base), HBH2O2, HC3H5O2, NaNO2, C3H9N. For each compound a. Decide whether the compound behaves as an acid or base in solution b. Write the equation for the dissociation of the compound in water c. Write the equilibrium expression for the dissociation in water

Solved • Apr 13, 2020

Ka and Kb

Q. Fluoroacetic acid occurs in “Gifblaar” one of the most poisonous plants found in South Africa. The compound is highly toxic and causes convulsions and ventricular fibrillation. If a solution that is 0.032 M fluoroacetic acid, HC2H2FO2, has a pH of 2.17 at a given temperature, what is the ionization constant for fluoroacetic acid ?

Solved • Apr 13, 2020

Ka and Kb

Q. Oxalic acid (H2C2O4) dissociates in two steps and releases one proton in each step. Ka1 = 6.0 x 10^-2 and Ka2 = 6.1 x 10^-5. (a) Calculate Kb of oxalate ion C2O4^2-. (b) Calculate Kb of hydrogen oxalate ion HC2O4^-.

Solved • Apr 10, 2020

Ka and Kb

Q. How would Kb for the formate ion be calculated, given the Ka for formic acid?

Solved • Apr 7, 2020

Ka and Kb

Q. The concentration of a carbonic acid (H2CO3) solution is 0.0042 M. Ka1 and Ka2 for carbonic acid are 4.3 x 10−7 and 5.6 x 10−11, respectively. (a) Calculate pH of this solution. (b) Calculate [HCO3−] and [CO32−]. (No use of ICE.)

Solved • Apr 7, 2020