1. One 1000 ml brown volumetric flask, one 100 ml conical flask, one 100 ml brown jar, two 10 ml pipettes, and one red head pipette;
2, test agent (preparation method: 1.7000 g of silver nitrate plus distilled water to a volume of 1000 ml of brown volumetric flask, placed in a dark place for use);
3, color reagent (preparation method: 0.02 ~ 0.05 grams of test Yinling [Taobao has sold] added to a jar containing 100 ml of acetone, placed in a dark place for use).
(two) detection method
1. Use a 10 ml pipette to extract 5 ml of the test solution into a conical flask;
2, the dropper takes 2 drops of the developer (about 0.1ml) into the Erlenmeyer flask, the liquid color becomes light yellow;
3. Slowly drip the test agent into the conical flask with a 10 ml pipette (shake the conical flask while titrating, observe the color change);
4. When the color of the liquid changes from light yellow to light orange red, the test agent consumed is read on the pipette.
5. The number of milliliters of test agent consumed is the tens of fractions of the test solution (concentration of the ratio of the syrup). If the test agent is used, 0.05 ml, the concentration is 9.0 parts per thousand (0.005 ‰); 0.3 ml, the concentration is 0.3 parts per thousand (0.03 ‰); if 1.0 ml is consumed, the concentration is one ten thousandth (ie 0.1 ‰); if 5.0 ml is consumed, the concentration is 10,000 parts per million. (ie 0.5‰) and so on.
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