dry G4 Gooch crucible in a oven at

dry G4 Gooch crucible in a oven at 105. Wash the crucible with 10 ml of ethyl alcol, then with 10 ml of ethyl ther. dry for 30 minutes at 98 to 100 , cool in a desiccator and weigh.
to 1 g of sample, accurately weighed add 80 ml of 1:1 volume of water: ethanol in a 100 ml . stir for 15 minutes vigourously. add 0.4 ml of fehling solution (A), and 0.35 ml of the standard sodium hydroxide solution. graduated flask bình định mức

Kết quả (Anh) 1:

dry G4 Gooch crucible in a oven at 105. Wash the crucible with 10 ml of ethyl alcol, then with 10 ml of ethyl ther. dry for 30 minutes at 98 to 100, cool in a desiccator and weigh.to 1 g of sample, weighed accurately add 80 ml of 1: 1 volume of water: ethanol in a 100 ml. stir for 15 minutes vigourously. Add 0.4 ml of fehling solution (A), and 0.35 ml of the standard sodium hydroxide solution. graduated flask flask