Zinc acetate ammonium sulphate

Materials Solutions of zinc chloride, copper sulphate, ammonium sulphide, sodium carbonate, and acetic acid. 

Many salts have the power of precipitating albuminoid substances from solution. The nature of the precipitate differs radically according to the salt used. In certain cases, the precipitate obtained is a metallo-organic compound, produced by a combination of salts with albuminoid substance. This is the case with ferric acetate, neutral or basic lead acetate, copper sulphate, and mercuric chloride. With other salts, such, for example, as with ammonium sulphate, zinc sulphate, potassium acetate, sodium sulphate and chloride, the precipitate is of another nature. The albuminoids precipitated have under-... 

Sulphuric acid Hydrochloric acid Nitric acid Caustic soda Sodium carbonate Sodium sulphate Copper sulphate Carbon disulphide Aluminium sulphate Oxygen (10,000m ) Hydrogen peroxide Citric acid Tannin extract Lead oxides (red lead, etc.) Zinc oxide Superphosphate Ammonium sulphate Calcium cyanamide Calcium carbide Ammonia Acetic acid... 

Determination of chlorate as silver chloride Discussion. The chlorate is reduced to chloride, and the latter is determined as silver chloride, AgCl. The reduction may be performed with iron(II) sulphate solution, sulphur dioxide, or by zinc powder and acetic (ethanoic) acid. Alkali chlorates may be quantitatively converted into chlorides by three evaporations with concentrated hydrochloric acid, or by evaporation with three times the weight of ammonium chloride. 

Procedure Weigh accurately 0.20 g of glycobiarsol into a 250-ml conical flask and add 10.0 ml of 0.05 M disodium edetate. Warm the contents of the flask over a water-bath until glycobiarsol gets dissolved completely and then cool the contents to the room temperature (25°C). Add to it 10.0 ml of acetic acid-ammonium acetate buffer, 25.00 ml of alcohol and 2 ml of dithizone solution as an indicator. Titrate the excess of disodium edetate with 0.025 M zinc sulphate until the resulting solution turns rose pink in colour. Each millilitre of 0.05 M disodium edetate consumed is equivalent to 10.45 mg of Bi. 

The residue insoluble in water or a new portion of the substance is treated with dilute acetic acid, in which the zinc oxide should dissolve easily without evolution of gas. Effervescence indicates carbonates (white lead, chalk) if hydrogen sulphide is evolved, zinc sulphide (lithopone) may be present. Any residue insoluble in acetic acid may contain lead, barium or calcium sulphate or day, these being recognised as in white lead (q.v., paragraph i). Lastly, the acetic acid solution, when treated with caustic soda, should give a white precipitate quite soluble in excess of alkali and the alkaline solution should give a white precipitate with ammonium sulphide. 

Nickel may also be prepared by electrolysis of ammoniacal, acidified, or neutral solutions of its salts, a process that is used commercially for electroplating.5 It is precipitated by zinc from ammoniacal solutions of its salts, and is left as a residue on igniting either the oxalate or the double nickel ammonium oxalate. Solutions of nickel salts are reduced by hydrogen when heated under pressure, metallic nickel being precipitated out of solution.7 Thus a N/5 solution of nickel sulphate deposits metallic nickel at 186° C. in the presence of hydrogen at 100 atmospheres pressure, whilst a similar concentration of nickel acetate deposits a pure nickel under like conditions at 168° C. 

Materials Solutions of zinc sulphate, of ammonium sulphide, of acetic acid, and hydrogen sulphide. 

Solutions of the following salts are usually 0.5 M with respect to the hydrated salt ammonium thiocyanate, copper sulphate, iron(IIl) chloride, iron(II) sulphate, potassium iodide, potassium thiocyanate. Solutions of the following salts are usually 0.25 M barium chloride, calcium chloride, lead acetate, potassium chromate, potassium hexacyanoferrate(II), tin(II) chloride (with few pieces of Sn to stop aerial oxidation), zinc nitrate. 

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