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Configuration of analytical chemistry standard solutions

MindMap Gallery Configuration of analytical chemistry standard solutions

Configuration of analytical chemistry standard solutions

It includes four major titrations, including a summary of knowledge points such as acid-base titration, non-aqueous titration, coordination titration, precipitation titration, redox titration, etc., to help you familiarize yourself with the key points of knowledge and enhance your memory. Students in need can save it.

Edited at 2024-11-19 20:21:40

JackTyler·881

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Configuration of analytical chemistry standard solutions

JackTyler·881

Recent works View more works>>

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Outline

Configuration of standard solution

Acid-base titration

Acid standard solution

Base material: anhydrous sodium carbonate, borax

Indicator: methyl orange, methyl red

Method: indirect method

Alkali standard solution

Reference substance: Potassium hydrogen phthalate (amphitropic substance), oxalic acid

Indicator: phenolphthalein

Method: Indirect method (prepare saturated NaoH solution and take the supernatant)

Non-aqueous titration

Titration of bases

Perchloric acid solution in glacial acetic acid

Base material: potassium hydrogen phthalate

Indicator: crystal violet (purple-yellow)

titration of acid

Sodium methoxide in benzene-methanol solution

Base material: benzoic acid

Indicators: thymol blue, azo violet

Solvent selection

Not weak carboxylic acids: alcohols (amphophilic)

Weak acid: ethylenediamine, dimethylformamide (alkaline)

Differential titration of mixed acids: Differentiating solvents such as methyl isobutyl ketone

coordination titration

EDTA standard solution

Reference material: zinc oxide, metallic zinc (direct configuration), calcium carbonate

indicator

EBT: PH9.0-10.5 ammonia buffer solution

Xylenol Orange: pH<6.0 acetate buffer solution

Indirect method, storage in hard glass bottles, long-term polyethylene bottles

precipitation titration

Morfa

Titrant: silver nitrate standard solution (direct method configuration)

Indicator: K2Cro4

Test objects: Br-, Cl-

PH (6.0--10.5) neutral or weakly alkaline

Forhad method

Titrant: NH4SCN

Indicator: Ferric ammonium vitriol

Test object: direct Ag back titration X-

PH (acidic) prevents hydrolysis of iron ions

fayang justice

Chloride ion: fluorescent yellow

Thiocyanate: eosin

Silver ion: methyl violet

PH(PKa--10.0)

redox titration

NaS2O3 standard solution

Potassium chromate reference material calibration method

Reference material: potassium chromate

Chromate reacts with excess iodide ions in acidic conditions to obtain elemental iodine

Quantitative reaction with thiosulfate

Indicator: starch

I2 standard solution comparison method

Iodine standard solution

AS2O3 reference material calibration

Calibration of sodium thiosulfate standard solution (comparative method)

Protect from light to prevent iodine ions from turning into iodine elements

Potassium permanganate standard solution

Reference materials: NaC2O4 (commonly used), oxalic acid, arsenic trioxide

self-indicator

Control acidity with sulfuric acid, brown bottle