SLE133 Lecture 10: Chapter 10 sample question
DiplomaofHealthSciences
DiplomaofScience
SLE133ChemistryinOurWorld
SLE133CHEMISTRYINOURWORLDSAMPLEQUESTIONS2018 Page23of25
Q10Acidsandbases[2+2+2+2+4+3=15marks]
a)LabeltheBrønsted‐Lowryacidsandbasesinthefollowingequation,thenidentifythe
conjugateacid‐basepairsbyjoiningthemwithalineasdoneinyourtextbook.
[2marks]
HSO4
–(aq)+HS–(aq) SO4
2–(aq)+H2S(aq)
b)i)Whatarethetwocomponentsofabuffersystem?
ii)ExplainhowabufferworkstoholdpHnearlyconstant.
[2marks]
i)
ii)
c)ThepHofapricotnectarwasfoundtobe3.80at25°C.
i)Calculatethe[H3O+]oftheapricotnectar.
[1mark]
c)ii)Calculatethe[OH–]oftheapricotnectar.
[1mark]