Ionic EquilibriumHard
Question
A student was given 0.01 mole of a weak organic acid and told to determine the Ka of the acid. He prepared 100 ml of an aqueous solution containing the sample. The volume of 50 ml of this solution was then titrated with NaOH to the equivalence point. The titrated solution was then mixed with the other 50 ml of the solution and the pH was determined. A value of 4.80 was obtained for the mixed solution. What is the approximate value of pKa for the acid?
Options
A.5.10
B.4.50
C.4.80
D.4.20
More Ionic Equilibrium Questions
The composition of an acidic buffer mixture made up of HA and NaA of total molarity 0.29 having pH = 4.4 and Ka = 1.8 &#...Which of the following mixture gives a buffer solution with $pH = 9.25$ ?Given : ${pK}_{b}\left( {NH}_{4}OH \right) = 4....What % of the carbon in the H2CO3 - HCO3- buffer should be in the form of HCO3- so as to have a neutral solution? (Ka = ...Calculate the degree of hydrolysis of 0.005 M-K2CrO4. For H2CrO4, Ka1 = infinite, Ka2 =$5 \times 10^{- 7}$....The degree of dissociation of water at 25°C is 1.8 × 10–7% and the density is 1.0 g cm–3. The ionic product for water is...