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【正文】 fore: excessive, AgCl precipitation adsorption of Cl AgCl Cl + FIn (yellowgreen)
After Sp: Ag +, excessive AgCl precipitation Ag + adsorption, adsorption FIn reprecipitation AgCl, Ag + + FIn = = AgCl, Ag +, FIn (pink) The finish color changes: from yellowish green to orange Three, instruments and reagents
Equipment and materials：Acid type buret (150 ml), taper bottle (250 ml), volumetric flask (100 ml), pipette (20 ml, 10 ml), measuring cylinder (100 ml, 10 ml), beaker (100 ml), brown reagent bottles (500 ml), analytical balance, platform scale. The reagent and drug: Analysis of AgNO3 (s, pure), NaCl (s,
analysis of pure), physiological saline, fluorescent yellow starch. Fourth, the experimental steps
Accurately moving 25 ml concentration is mol ╱ L of silver nitrate standard solution in the middle of 250 ml volumetric flask, dilute to scale as a standard solution titration.
Accurately moving saline ml to 250 ml conical flask, add 50 ml water, 3 drops of fluorescent yellow indicator, 5% starch indicator 5 ml, under continuous agitation, using silver nitrate
standard solution titration to solution from yellow to pink is the end point. Record the consumption volume of silver nitrate
standard solution, parallel determination of 3, calculate the sodium chloride content in saline and relative mean deviation.
Fifth, data recording and processing
Formula: ρ = VMrNaClCAgNO3 x 100
The average deviation d= dr=d/ρ100%=%
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