Practical Chemistry for Engineering Students
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In our eReader you can find the full English version of the book. Read Practical Chemistry for Engineering Students Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Practical Chemistry for Engineering Students
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is produced, of arsenic sulphide.
Equation — 2 AsClg + SH^S = AsgSg -t- 6HC1.
Exp. 4. Marsh's Test for Arsenic.
This is a very delicate test for arsenic, and is carried out as follows : — ■ Fit up a 4-oz. conical flask with thistle-funnel and right- angled tube, as shown in Fig. 51. The tube should be of hard glass, and should be drawn out at the end. Place in this flask a few pieces of zinc (arsenic free), and just cover them with distilled water. Then replace the cork, and pour a few drops of... strong hydrochloric acid through the thistle-funnel.
Hydrogen gas will be evolved, and while the air is being expelled from the apparatus, dissolve a little arsenic oxide indilute hydro- chloric acid.
Now ascertain whether the hydrogen is air-free by collecting a test-tube of the gas by upward displacement, closing the mouth of the tube with the thumb, and bringing it mouth downwards to a flame.
If the gas burns quietly i,t may be lighted at the end of the Fig. 51.— {From Thorpe's ' tative Chemical Analysis") 104 CHEMISTKY FOR ENGINEERING STUDENTS tube, and continues burning with a blue flame.
What to read after Practical Chemistry for Engineering Students?
You can find similar books in the "Read Also" column, or choose other free books by Arthur James Hale to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
is produced, of arsenic sulphide.
Equation — 2 AsClg + SH^S = AsgSg -t- 6HC1.
Exp. 4. Marsh's Test for Arsenic.
This is a very delicate test for arsenic, and is carried out as follows : — ■ Fit up a 4-oz. conical flask with thistle-funnel and right- angled tube, as shown in Fig. 51. The tube should be of hard glass, and should be drawn out at the end. Place in this flask a few pieces of zinc (arsenic free), and just cover them with distilled water. Then replace the cork, and pour a few drops of... strong hydrochloric acid through the thistle-funnel.
Hydrogen gas will be evolved, and while the air is being expelled from the apparatus, dissolve a little arsenic oxide indilute hydro- chloric acid.
Now ascertain whether the hydrogen is air-free by collecting a test-tube of the gas by upward displacement, closing the mouth of the tube with the thumb, and bringing it mouth downwards to a flame.
If the gas burns quietly i,t may be lighted at the end of the Fig. 51.— {From Thorpe's ' tative Chemical Analysis") 104 CHEMISTKY FOR ENGINEERING STUDENTS tube, and continues burning with a blue flame.
What to read after Practical Chemistry for Engineering Students?
You can find similar books in the "Read Also" column, or choose other free books by Arthur James Hale to read onlineMoreLess
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