1. A certain weak acid, HA, has a K a value of 9.6x10 -7 . Calculate the percent
ID: 511549 • Letter: 1
Question
1. A certain weak acid, HA, has a Ka value of 9.6x10-7. Calculate the percent ionization of HA in a 0.10 M solution.
2. Acetic acid, CH3CO2H, is the solute that gives vinegar its characteristic odor and sour taste. Calculate the concentration of OH- in 0.0123 M CH3CO2H.
3. Morphine (C4H9NO) is a weak organic base with pKb = 5.68. Calculate the pH in a 1.10 x 10-2M morpholine solution.
4. Sodium benzoate (C6H5CO2Na) is used as a food preservative. Calculate the concentrations of all species present (Na+, C6H5CO2, C6H5CO2H, H3O+ and OH) in 0.058 M sodium benzoate.
Explanation / Answer
1)
Ka = 9.6 x 10^-7
concentration = 0.1 M
[H+] = sqrt (Ka x C)
=sqrt (9.6 x 10^-7 x 0.1)
= 3.098 x 10^-4 M
% ionization = (H+ / C) x 100
= (3.098 x 10^-4 / 0.1) x 100
% ionization = 0.31 %
2)
C = 0.0123 M
Ka = 1.8 x 10^-5
[H+] = sqrt (1.8 x 10^-5 x 0.0123)
= 4.705 x 10^-4 M
[OH-] = 2.12 x 10^-11 M
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