Salt, Glauber

Mi. (B) N32S04 PRODUCTION FROM GLAUBERS SALT. MELTING TANK INCLUDED... 

There are two forms of sodium sulfate (Na SO ). One is a called salt cake and contains no water and, thus, is called anhydrous sodium sulfate. When one molecule of the dry form combines with 10 molecules of water (decahydrate), it is known as Glaubers salt (Na SO lOHjO) Sodium sulfate is produced by several processes, one of which is 2NaCl + H SO —> Na SO + 2HC1. A large number of sodium salts can exist in both the anhydrous (dry) form and the hydrous (attached to water) form. 

Long before sodium and potassium metals were isolated, many of their compounds were in common use. Among the most important of these were potash (potassium carbonate), cream of tartar, saltpeter, alum, common salt, Glaubers salt, and soda (sodium carbonate). Both potash and soda have been used since ancient times in the manufacture of glass. 

Glauber, Johann Rudolph [1603 (or 1604)—1668]. Dutch (or German) "iaerochemist" [belonging to the 16th century school of medicine basedon principles of Swiss physician Paracelsus (1493— 1541)] who prepd expl substances Potassium Picrate and Ammonium Nitrate. He also prepd the salt known as "Glauber salt" (cryst Na sulfate) and pure nitric and hydrochloric acid. 

By an extended series of experiments he demonstrates that the acid in the new salt gives the same results as the acid in Glaubers salt, and that... 

Observe the thermal phenomena occurring when 0.1 mol of the following salts is dissolved in 50 ml of water ammonium nitrate, anhydrous sodium sulphate, and sodium sulphate decahydrate (Glauber salt). For this purpose, pour 50 ml of water into a 100-ml beaker, measure its temperature, and, after pouring in the relevant amount of a salt, see how the temperature changes. Explain what occurs. 

Run a similar experiment with gypsum and Glauber salt. 

Preparation of Sodium Sulphate and Its Hydrates. Calculate the amount of Glauber salt needed to saturate 20 ml of water at 32 °C. Prepare at this temperature a saturated sodium sulphate solution, filter it into two small flasks and into a dry test tube. 

Sodium Sulphate Decahydrate. Drop a crystal of Glauber salt into the sodium sulphate solution in one of the flasks. Examine the shape of the crystals precipitating from the solution at room temperature (below 25 °C) under a microscope. 

Lower a small crystal of Glauber salt into the solution. Explain what happens. Draw curves of the solubility of anhydrous sodium sulphate and its crystallohydrates. Acquaint yourself with the phase diagram of the sodium sulphate-water system. In what parts of the diagram is the system invariant, monovariant, or divariant ... 

Heat test tube 1 with the reaction mixture to 35-40 °C, place it together with outer test tube 6 into a beaker with water whose temperature is 25-28 °C, and record the temperature every 30 s. If the temperature of the reaction mixture dropped continuously to below 30 °C, add a crystal of Glauber salt to the contents of the test tube and repeat the heating-cooling cycle until a temperature plateau is obtained. Plot the temperature against the time. What is the temperature plateau in cooling due to ... 

Glauber. Salt Waters. — Some writers give this name to those waters holding sulphate of soda in solution, Some of these are warm, and on this account are called the warm alkaline glauber salt waters. To this division belong tire famous springs of Carlsbad, VOL. II. 

The yield of salt is about 165 per cent calculated on the basis of naphthalene, or about 400 to 420 grams. From the mother liquor, containing some of the a acid in addition to tar and a trace of acid, Glauber salt may be recovered. 

These dyes are generally very difficultly soluble and are often explosive in the drv state. Henc e, tliey must be mixed with a large ijuantily of Glauber salt or lUiuketed is a paste with water. 

CNC RETARDER P 5% Glauber Salt 1 % Acetic Acid 2% CNC LEVELER LF-25... 

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