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4 Test method
The test reagents of this standard should be analytical reagents that meet the current national standards or industry standards, and the test water should be distilled water or water of equivalent purity
4.
4.
4.
4.
4.
4.
4.
Table 2
4.
Use a pipette to draw 1mL of the colorimetric stock solution into a 25mL colorimetric tube, add water to dilute to 10.
4.
Weigh 0.
4.
4.
The acetanilide is hydrolyzed by heating an aniline in an acidic solution
Reaction equation:
4.
4.
2.
2.
1 Potassium bromide ;
4.
2.
2.
2 Hydrochloric acid solution: (1+3);
4.
2.
2.
3 Sodium nitrite standard titration solution: c(NaNO 2 )=0.
1mol/L;
4.
2.
2.
4 Starch potassium iodide indicator solution: Weigh 2 g of soluble starch and add 5 mL of water to make a paste
.
Another 0.
5g potassium iodide and 1g zinc chloride were dissolved in 45mL water and boiled
.
Pour the starch paste into the potassium iodide solution, boil for 2 min under stirring, and put it into a brown reagent bottle for storage after cooling
.
The use period is one week
.
4.
2.
3 Apparatus
4.
2.
3.
1 Magnetic stirrer;
4.
2.
3.
2 Permanent stop titrator or device made according to Figure 1
.
When using a permanent stop titrator, choose a polarization voltage of 50mV, a sensitivity of 10-9/div, and a threshold of 60 cells
.
Before use or after passivation, platinum-platinum electrode should be soaked in lotion for 40~60s, or soaked in boiling nitric acid solution containing a small amount of ferric chloride for 30s, and then washed with distilled water to activate it .
Related Links: Industrial Acetanilide (1)