chemistry notes - acid base equilibrium

7/27/2019 Chemistry Notes - Acid Base Equilibrium

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26/27

SCH4U -Titration CurvesDuring an acid-base titration the change in pH over the course of the reaction when plotted against thevolume of titrant added forms a characteristic curve. The nature of this curve at and around theequivalence point can illustrate the latitude we have in choosing an indicator.1) Consider the reaction between the strong acid HCI and the strong base NaOH:

HCI(aq) + NaOH(aq) - NaCI(aq) + H20(I)If we titrate a 25.0 mL sam pie of 0.1 OOMHCI with 0.100M NaOH, we can monitor the pH change overthe course of the reaction as base is gradually added to the acid in the following volumes:a) Determine the initial pH of the acid solution before the titration beains.

'P H , - I D " l [Hul- \0 '1 [0. ItlD1

: 1a) Determine the volume of NaOH that will be required to reach the equivalence point of this titration.

1\\1(\ : l\j f\ 1'1"b\\ ' \lIKI 1 JN :> .dt \ z : n a.tI~~r; ( ').o is L ..~- lD\")(C.C~Ii) < .. e : . \(J.~()1; e ~ ~Sml: C J . t:,t)~>, \n \: )\ r n ,b) What will the pH of the solution be at the equivalence point?

A t C2 .'1 u i' ' '' \( lncc . p1) N a .U '< ; ' 0- 1l~\l'lTO\\ - . o . \ ' t .\ '1 1 0 . [ 1 + H2o " ? " : . 1 \ ~ \\ ~ (' \\1.()1

c) Determine the pH of the solution at the point Y2way to the equivalence point (ie; after 12.5 mLNaOH is added) #[,. .(.6 ': . \-\LI.

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volume of base added (horizontal axis).


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SCH4U: Titration Curves and Choice of IndicatorsA) Strong Acid + Strong Base

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C) Weak Base + Strong Acid ... I\: ','") Weak Acid + Strong Base14 ,'r......, .;.'" '" '" lr~----..,.. ...... -- ;-:--...".-'""'7 " --'i.1:~ ;.1'~'

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chemistry notes - acid base equilibrium

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