Valentin's Practical Chemistry
Valentin's Practical Chemistry
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In our eReader you can find the full English version of the book. Read Valentin's Practical Chemistry 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 Valentin's Practical Chemistry
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Na^S.Oa + ^ClNaO + OH, = 2HNaS0, + 4NaCl.
Na^SgOg gives with Fe^jCl^ at first a reddish violet coloration (difference between sulphites and thiosulphates), but on standing the solution is slowly decolorised (more readily on heating), with formation of FeCl^, thus : Na,S,03 4- 4Fe,Cls + 50H, = 2NaHS0, + 8FeCl, + 8HC1.
Nascent hydrogen reduces thiosulphates, and sulphuretted hydrogen is evolved : Na,S,03 + 4H, + 2HC1 = 2SH, + 30H, + 2NaCl.
Some sulphur is always precipitated as well.
Sodium thios...ulphate is a useful solvent for haloid silver salts (for which it is much used in photogi-aphy), Hg^Cl, and PbSO^. Calcium t-hiosulphate, CaS^Og, is used as an agent for removing the last traces of chlorine in the bleaching of paper pulp, and from fabrics bleached ^y means of bleaching powder, to prevent their deterioration by the traces of chlorine which they are apt to retain. It has on that account received the name of "antichlor." The free hydrochloric acid which is formed in the reaction is neutralised by passing the fabrics through a weak alkali bath.
What to read after Valentin's Practical Chemistry?
You can find similar books in the "Read Also" column, or choose other free books by William George Valentin to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Na^S.Oa + ^ClNaO + OH, = 2HNaS0, + 4NaCl.
Na^SgOg gives with Fe^jCl^ at first a reddish violet coloration (difference between sulphites and thiosulphates), but on standing the solution is slowly decolorised (more readily on heating), with formation of FeCl^, thus : Na,S,03 4- 4Fe,Cls + 50H, = 2NaHS0, + 8FeCl, + 8HC1.
Nascent hydrogen reduces thiosulphates, and sulphuretted hydrogen is evolved : Na,S,03 + 4H, + 2HC1 = 2SH, + 30H, + 2NaCl.
Some sulphur is always precipitated as well.
Sodium thios...ulphate is a useful solvent for haloid silver salts (for which it is much used in photogi-aphy), Hg^Cl, and PbSO^. Calcium t-hiosulphate, CaS^Og, is used as an agent for removing the last traces of chlorine in the bleaching of paper pulp, and from fabrics bleached ^y means of bleaching powder, to prevent their deterioration by the traces of chlorine which they are apt to retain. It has on that account received the name of "antichlor." The free hydrochloric acid which is formed in the reaction is neutralised by passing the fabrics through a weak alkali bath.
What to read after Valentin's Practical Chemistry?
You can find similar books in the "Read Also" column, or choose other free books by William George Valentin to read onlineMoreLess
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