The cleaning and electro-plating of metals; . 5846 NaCl The Cleaning and Electro-Plating of Metals 91 CYANIDE DETERMINATION INPOTASSIUM CYANIDE. Weigh off about 15 grams of the potassiumcyanide in a tared weighing bottle, dissolve inwater without heat and dilute to 500 Take out 10 with pipette into a beaker,add 2 of Cone. N H^ O H and 1 K Isolution (2%) and about 100 water, then Nrun in jt: Ag N O3 from a burette until a per-manent white precipitate of silver iodide isformed. The number of of Ag N O3 usedmultiplied by .005202 and divided by theweight taken, then m
The cleaning and electro-plating of metals; . 5846 NaCl The Cleaning and Electro-Plating of Metals 91 CYANIDE DETERMINATION INPOTASSIUM CYANIDE. Weigh off about 15 grams of the potassiumcyanide in a tared weighing bottle, dissolve inwater without heat and dilute to 500 Take out 10 with pipette into a beaker,add 2 of Cone. N H^ O H and 1 K Isolution (2%) and about 100 water, then Nrun in jt: Ag N O3 from a burette until a per-manent white precipitate of silver iodide isformed. The number of of Ag N O3 usedmultiplied by .005202 and divided by theweight taken, then multiplied by 100 = % CNin : grams of potassium cyanide were dis-solved and diluted to 500 , then 10 N(.3051 grams) required tt: Ag N O3 X .005202=. C N. Factors: CN X = NaCNCNX =-KCNNaCN X =CNKCN X -= CNAgX = AgClAg X = CNAgCl X = CNAg X = KCNAg X = NaCN 92 The Cleaning and Electro-Plating of Metals. The Cleaning and Electro-Plating of Metals 93 TOTAL POTASSIUM AND SODIUM CYANIDE DETERMINATION IN SILVER SOLUTION. In an apparatus as shown in Fig. 16 distill of silver solution to be tested for cyanide,potassium cyanide, or sodium cyanide, as fol-lows : Take 10 of silver solution, add 10 ofwater (H2O), and place in Jena Kjeldahl Flask(C) connected with stop cock funnel (D) andconnect with glass tube into Liebig Condenser(F). On receiving end of condenser have bot-tles (K & M) connected to collect in funnel (D) 25 sulphuric acid(H2 S O4) and 25 water (H2 O) and thenplace in bottle (K) at receiving end of con-denser 50 water (H2 O) and 1 gram ofsodium hydrate (Na O H). Add the sulphuricacid and water that is in funnel (D) to the sil-ver solution in Kjeldahl Flask (C) drop bydrop while over flame (B). A slow stream ofwater must be kept running through the con-denser (F) by connecting the lower rubb
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1921
