Quiz
DF12 Buffers
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Questions in this quiz (5)
1Choose the correct equation for calculating pKa from Ka.
- ApKa = − logKa
- BpKa= − Ka
- CpKa = 10^(Ka)
2Buffers are solutions of mixtures of compounds that [blank_start]resist changes[blank_end] in pH upon the addition of [blank_start]small quantities[blank_end] of acid or alkali, that are composed of [blank_start]equal amounts[blank_end] of a weak acid or weak base and the salt of its conjugate base or acid.
- Aresist changes
- Bsmall quantities
- Cequal amounts
3Buffers are important in pharmacy to control solution pH of medicines, [blank_start]improve[blank_end] drug aqueous solubility, [blank_start]maximise[blank_end] drug chemical stability, [blank_start]minimise[blank_end] tissue irritancy, and [blank_start]optimise[blank_end] drug absorption.
- Aimprove
- Breduce
- Cmaximise
- Dminimise
- Eminimise
- Fmaximise
- Goptimise
- Hdecrease
4Choose the correct Henderson-Hasselbalch equation.
- ApH = pKa + log [unionised] / [ionised]
- BpH = pKa + log [ionised] / [unionised]
5Buffers work because adding more acidic product will drive the equation back to the [blank_start]left[blank_end] and adding more basic reactant will drive the reaction to the [blank_start]right[blank_end].
Buffer [blank_start]capacity[blank_end] is the ability of a buffer to resist changes in pH on addition of acid or alkali. A buffer is at maximum when [blank_start]pH = pKa[blank_end] (± 1)- Aleft
- Bright
- Ccapacity
- DpH = pKa
Information
- Description
- PHCY211 (Formulation) Quiz on DF12 Buffers, created by Mer Scott on 29/04/2018.
- Author
- Mer Scott
- Language
- English
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