Volumetric Analysis 定性分析

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Presentation transcript:

Volumetric Analysis 定性分析 Topic IV Acids and Bases Topic XV Analytical Chemistry

Learning outcome Manipulate titration apparatus pipette burette conical flask volumetric flask electrical balance Detection of end point Calculations

pipette Washing tap water deionised water solution to be transferred Transfer solution via pipette

Burette Washing tap water deionised water solution to be filled in Air bubbles Control the burette Reading : 0.02 cm³

Conical flask / volumetric flask Washing tap water deionised water

Case I Technique approach Four experiments are arranged HCl(aq) vs NaOH(aq) Preparation of standard Na2CO3(aq) Titration of Na2CO3(aq) vs HCl(aq) Titration of CH3CO2H(aq) vs NaOH(aq)

Experiment 1 Titration : HCl(aq) vs NaOH(aq) Pipette and pipette filler Burette, conical flask Burette reading 0.02 cm³ End point of titration methyl orange

Experiment 2 Preparation standard Na2CO3(aq) solution Weighing bottle, electrical balance Dissolve the solid Pour the solution into a volumetric flask Graduation mark of volumetric flask

Experiment 3 Titration Na2CO3(aq) vs HCl(aq) pipette burette end point methyl red

Experiment 4 (a) Assessment Titration : CH3CO2H(aq) vs NaOH(aq) (I) Dilution of a vinegar solution pipette volumetric flask

Experiment 4 (b) Assessment (II) Titration : dilute vinegar solution vs NaOH(aq) Pipette Burette, conical flask Burette reading 0.02 cm³ End point of titration phenolphthalein Calculations

Case II Concept approach Three experiments are arranged Preparation of Na2CO3(aq) Titration of Na2CO3(aq) vs HCl(aq) Titration of HCl(aq) vs NaOH(aq)

Experiment 1 Preparation standard Na2CO3(aq) solution Weighing bottle Dissolving the solid Pour the solution into a volumetric flask Graduation mark of volumetric flask

Experiment 2 Titration Na2CO3(aq) vs HCl(aq) pipette and pipette filler burette, conical flask end point methyl orange

Experiment 3 (a) Assessment Titration : HCl(aq) vs NaOH(aq) (I) Dilution of a NaOH(aq) solution pipette volumetric flask

Experiment 3 (b) Assessment (II) Titration : dilute NaOH(aq) vs HCl(aq) Pipette Burette, conical flask Burette reading 0.02 cm³ End point of titration methyl red Calculations

Case III Concept approach Three experiments are arranged Preparation of oxalic acid, HO2CCO2H(aq) Titration of HO2CCO2H(aq) vs NaOH(aq) Titration of HCl(aq) vs NaOH(aq)

Experiments Titration of oxalic acid vs NaOH(aq) phenolphthalein Titration of HCl(aq) vs NaOH(aq) methyl orange