英语翻译
英语翻译
4.2 Production of Reagent 1,1l:
1.Measure 1l H2SO4 75% in a 1l measuring cylinder and fill it in a 1l flask black.
2.Close the flask and label the flask.
3.Check if the flask is not leaking.
4.Repeat the steps 1.- 3.for flask 2.-4.
4.3 Production of Reagent 2,250ml:
1.Prepare under cooling a 20% H2SO4 after densitiy (r = 1,139 g/cm3 at 20°C) using approx.220 ml ultrapure water and approx.40 ml H2SO4 80%.For a bigger batch use according multiple amounts.
2.Measure 250 ml (± 1.5 ml) H2SO4 20% with a measuring cylinder.
3.Put a weighing dish on a balance (for analysis) and tare.
4.Weigh in 1.265 g Ag2SO4 with the help of an applicator.
5.Fill up with 20% H2SO4 to approx.200 ml.
6.Stirr until it is completly desolved.
7.Weigh in 0.809 g K2Cr2O7 with the help of an applicator in a weighing dish.
8.In an extractor hood transfer the weighed in amount of K2Cr2O7 with the rest of 20% H2SO4 completely into the beaker.
9.Stirr at 40°C (heating plate) until it is completely desolved.
10.Transfer the warm reagent in a 250 ml flask black.
11.Close the flask and label the flask
12.Check if the flask is not leaking.
4.4 Production of Reagent 3,50g:
1.Put a 100 ml plastic flask on a balance (for analysis) and tare.
2.Weigh in 50 g saccharose with the help of an applicator and a powder funnel.
3.Close the flask and label the flask.
4.2 Production of Reagent 1,1l:
1.Measure 1l H2SO4 75% in a 1l measuring cylinder and fill it in a 1l flask black.
2.Close the flask and label the flask.
3.Check if the flask is not leaking.
4.Repeat the steps 1.- 3.for flask 2.-4.
4.3 Production of Reagent 2,250ml:
1.Prepare under cooling a 20% H2SO4 after densitiy (r = 1,139 g/cm3 at 20°C) using approx.220 ml ultrapure water and approx.40 ml H2SO4 80%.For a bigger batch use according multiple amounts.
2.Measure 250 ml (± 1.5 ml) H2SO4 20% with a measuring cylinder.
3.Put a weighing dish on a balance (for analysis) and tare.
4.Weigh in 1.265 g Ag2SO4 with the help of an applicator.
5.Fill up with 20% H2SO4 to approx.200 ml.
6.Stirr until it is completly desolved.
7.Weigh in 0.809 g K2Cr2O7 with the help of an applicator in a weighing dish.
8.In an extractor hood transfer the weighed in amount of K2Cr2O7 with the rest of 20% H2SO4 completely into the beaker.
9.Stirr at 40°C (heating plate) until it is completely desolved.
10.Transfer the warm reagent in a 250 ml flask black.
11.Close the flask and label the flask
12.Check if the flask is not leaking.
4.4 Production of Reagent 3,50g:
1.Put a 100 ml plastic flask on a balance (for analysis) and tare.
2.Weigh in 50 g saccharose with the help of an applicator and a powder funnel.
3.Close the flask and label the flask.
英语人气:127 ℃时间:2020-02-05 17:39:51
优质解答
4.2试剂配方制作1(一升)1.使用量筒测量出一升的浓度为75%的硫酸并将其放入一个可盛一升的量筒2.盖上烧杯的盖子并在其上贴上标签3.查看烧杯是否有泄漏情况4.重复1至3步4.3试剂配方制作2(250毫升)1 准备20%稀释...
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