![]() Take 5 g of this product into a distillation flask, add 50ml of water and 2 g of tartaric acid, distill, and absorb the distillate with the absorption liquid placed in ice water bath. 5g of this product, add water 20 M l and hydrochloric acid 5ml, boil, steam can not wet lead acetate test paper black. ![]() 2 5G, Add 10ml of sodium hydroxide solution, boil, filter If the filtrate color, with the control solution (take 0.3ml gasification cobalt solution for color comparison, potassium dichromate solution 0 ,2 m l for color comparison, water 9-5ml mixed made) comparison, not deeper. Compared with the control solution made of 0M l, it should not be more concentrated (0. Take 20ml of the remaining filtrate under the pH item, check according to law (General Rule 0 8 0 2 ), and standard potassium sulfate solution 5. Compared with the control solution made of 0 M l, it should not be more concentrated (0. Take 10ml of the filtrate under pH, dilute it with water to 2 0 m l, and shake it well Take 20 m l for inspection according to law (General rule 0801), with standard sodium chloride solution 5. ![]() 5G, add water 50m l, boil for 5 minutes, let cool, filter, filter residue washed with water, combine filtrate and wash solution to make 50ml, the filtrate should be clear, encounter litmus test paper should be neutral reaction.
0 Comments
Leave a Reply. |