Ch. 14 Neutralization 3)Titration error

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1 Ch. 14 Neutralization 3)Titration error
1. 용액과 지시약    1) 표준 용액 : 강산, 강염기         산 표준용액 : 염산, 과염소산, 황산(질산은 사용 × )         염기 표준용액 : NaOH, KOH    2) 지시약              HIn + H2O ⇔ H3O+ +In In- + H2O ⇔ HIn + OH-                                     지시약의 변색범위 : 3)Titration error Indicator : selection of indicator Ability of eye : depend on the change in mL of reagent at equivalent point the concentration of indicator sensitivity of eye 1 = pKa pH

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3 2. Neutralization of strong acid and strong base
   [H3O+] : Acid, Dissociation of water HCl + NaOH ⇔ NaCl + H2O H+ + OH- ⇔ H2O ▣ Titration M-HCl 50 mL, add 0.1M-NaOH, 0.0005M-HCl 50 mL, add 0.001M-NaOHl

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8 The Effect of concentration
A : 0.05M-NaOH Add M-HCl B : 0.005M-NaOH M-HCl

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10 3. Weak acid + strong base 초기 pH : 약산의 pH 당량점 전 : 완충용액 당량점 : 음이온의 가수분해
   당량점 전 : 완충용액    당량점 : 음이온의 가수분해    당량점 후 : 강 염기

11 Generate a curve for the titration of 50.0.mL 0f 0.100M- Acetic acid
with 0.100M- Sodium hydroxide.

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16 The effect of concentration
The effect of reaction completeness Choosing of indicators

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22 The composition of solutions during acid/base titrations
Fig Plots of relative amount of acetic acid and acetate ion during a titration. The straight lines show the change in relative amounts of HOAc(α0 ) and OAc-(α1 ) during the titration of mL of 0.100M acetic acid. The curved line is the titration curve for the system.

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