1. A weak acid HA is 0.20 % ionized in a 0.04 M solution. What is the acid-ionization constant of HA?

Chemistry by OpenStax (2015-05-04)
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Chapter14: Acid-base Equilibria
Section: Chapter Questions
Problem 80E: Novocaine, C13H21O2N2Cl, is the salt of the base procaine and hydrochloric acid. The ionization...
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1. A weak acid HA is 0.20 % ionized in a 0.04 M solution. What is the acid-ionization constant of
HA?
2. The [OH] of a 0.200 M solution of a weak acid HA is 5.0 x 10-10 M. What is the acid-ionization
constant of HA?
3. Morphine is a weak base. The aqueous ionization of morphine can be indicated as:
M(aq) + H₂O MH'(aq) + OH(aq)
What mass of morphine is needed to prepare 600 cm³ of a solution with a pH of 11? Note:
Molar mass of morphine = 285.3 g.mol¹.
4. Cocaine is a weak base, and the aqueous ionization can be indicated as:
C(aq) + H₂O CH'(aq) + OH(aq)
In a 0.0040 M solution of cocaine, the ratio of OH(aq) ions to cocaine molecules is 1.0/120.
What is the value of Ks for cocaine?
Transcribed Image Text:1. A weak acid HA is 0.20 % ionized in a 0.04 M solution. What is the acid-ionization constant of HA? 2. The [OH] of a 0.200 M solution of a weak acid HA is 5.0 x 10-10 M. What is the acid-ionization constant of HA? 3. Morphine is a weak base. The aqueous ionization of morphine can be indicated as: M(aq) + H₂O MH'(aq) + OH(aq) What mass of morphine is needed to prepare 600 cm³ of a solution with a pH of 11? Note: Molar mass of morphine = 285.3 g.mol¹. 4. Cocaine is a weak base, and the aqueous ionization can be indicated as: C(aq) + H₂O CH'(aq) + OH(aq) In a 0.0040 M solution of cocaine, the ratio of OH(aq) ions to cocaine molecules is 1.0/120. What is the value of Ks for cocaine?
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