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用重铬酸钾法测定铁, 称取矿样 0.2500 g, 滴定时消耗 K2Cr2O7标准溶液23.68 mL, 此K2Cr2O7标准溶液 25.00 mL 在酸性介质中与过量的 KI 作用后, 析出的 I2需用 20.00 mL 的 Na2S2O3溶液滴定, 而此 Na2S2O3 1.00 mL 相当于 0.01587 g I2。请计算矿样中 Fe2O3的质量分数。[Mr(Fe2O3)= 159.7, Mr(I2)= 253.8]
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-1.1 What is Analytical Chemistry?
--Video
-1.2 Let's guess what are they doing?
--GUESS which instrument is she operating?
-2.1 Sampling and preparation of solid samples
--Video for sampling and preparation of solid samples
-2.1 Exercises
-2.2 Sampling and preparation of liquid samples
--Video for sampling and preparation of liquid samples
-2.2 Exercises
-2.3 Pretreatment of analytical samples
--Video for pretreatment of analytical samples
-2.3 Exercises
-3.1 Analytical error
-3.1 Exercises
-3.2 Significant figure convention
--Video for siginificant figure convention
-3.2 Exercises
-4.1 Overview of titrimetric analysis
--Video for overview of titrimetric analysis
-4.1 Exercises
-Looking for experimental errors
--Basic operation exercise of titration analysis
-Professional production-practice in 2018
--Video
--Video
-5.1 Brønsted-Lowry acid-base theory
--Video for Brønsted-Lowry acid-base theory
-5.1 Exercises
-5.2 Acid-base equilibrium in aqueous solution
--Video for acid-base equilibrium in aqueous solution
-5.2 Exercises
-5.3 Effect of acidity on distribution of dissociated species of weak acid/base
--Video for effect of acidity on distribution of dissociated species of weak acidbase
-5.3 Exercises
-5.4 Calculation of H+ concentration in acid/base solution
--Video for calculation of H+ concentration in acid/base solution
-5.4 Exercises
-5.5 Acid-base buffer solution
--Video for acid-base buffer solution
-5.5 Excercises
-5.6 Buffer capacity
-5.7 Acid-base titration curve
--Video for acid-base titration curve
-5.7 Exercises
-5.8 Factors influencing the titration jump
--Video factors influencing the titration jump
-5.9 Acid-base indicator
--Video for acid-base indicator
-5.9 Exercises
-5.10 Analysis of alkali mixture
--Video for analysis of alkali mixture
-5.10 Excercises
- Explanation of exercises
--Video
-6.1 Ethylenediaminetetraacetic Acid(EDTA)
--Video for Ethylenediaminetetraacetic Acid(EDTA)
-6.2 Formation constants and complexes
--Video for formation constants and complexes
-6.2 Exercises
-6.3 Side reaction and conditional formation constant
--Video for side reaction and conditional formation constant
-6.3 Exercises
-6.4 Complexometric titration curve
--Video for complexometric titration curve
-6.4 Exercises
-6.5 Metallochromic indicator
--Video for metallochromic indicator
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-6.5 Exercises
-6.6 Titration errors and the conditions for the accurate complexometric titration
--Video titration errors and the conditions for the accurate complexometric titration
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-6.6 Exercises
-Explanation of exercises
--Video
-7.1 Conditional potential
--Video for conditional potential
-7.1 Exercises
-7.2 Redox titration curve
--Video for redox titration curve
-7.2 Exercises
-7.3 Potassium permanganate titration
--Video for potassium permanganate titration
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-7.3 Exercises
-7.4 Potassium Dichromate titration
--Video for potassium Dichromate titration
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-7.4 Exercises
-7.5 Iodine titration
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-7.5 Exercises
-Explanation of exercises
--Video
-8.1 Precipitation titration
--Video for precipitation titration
-8.1 Exercises
-9.1 Solubility (Ⅰ)
-9.2 Solubility (Ⅱ)
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-9.2 Exercises
-9.3 Factors affecting solubility
--Video for factors affecting solubility
-9.3 Exercises
-9.4 Precipitation type and formation mechanism
--Video for precipitation type and formation mechanism
-9.5 Factors affecting the purity of precipitation
--Video for factors affecting the purity of precipitation
-9.5 Exercises
-9.6 Selection of precipitation conditions
--Video for selection of precipitation conditions
-9.6 Exercises
-10.1 Principle of spectrochemical analysis (Ⅰ)
--Video for principle of spectrochemical analysis (Ⅰ)
-10.1 Exercises
-10.2 Principle of spectrochemical analysis (Ⅱ)
--Video for principle of spectrochemical analysis (Ⅱ)
-10.2 Exercises
-10.3 Principle of Instrumentation
-- Video for principle of Instrumentation
-10.4 Standard curve method
--Video for standard curve method
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-10.4 Exercises
-10.5 Error in spectrophotometry
--Video for error in spectrophotometry
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-10.5 Exercises
-Final exam