Magnesium, equivalent weight

The lower equivalent weight of magnesium hydroxide compared to caustic soda, hydrated lime, and soda ash reduces the stoichiometric amounts necessary to neutralize a given amount of acid. Depending on relative alkah costs, magnesium hydroxide can offer the advantage of lower chemical costs. 

Magnesium-based additives are commonly employed to treat boiler furnace area fouling and corrosion conditions. They are injected into heavy fuel oil or other combustible material. Cerium is superior in action to magnesium salts, however, because an equivalent weight of cerium increases the melting point of the deposit more than that of magnesium. 

To calculate the hardness of a particular water the concentration of actual magnesium or calcium salt is converted to an equivalent weight of calcium carbonate. Hardness is generally expressed as equivalent parts per million (p.p.m.) of calcium carbonate irrespective of the actual salt present. By defmation, 1° English hardness... 

Magnesium Chloride Solution (10 g/L)—Transfer 1.000 g of magnesium chloride (MgCl2> or the equivalent weight of a hydrated salt), into a 100-mL volumetric flask... 

Gum ghatti is the calcium and magnesium salt of a complex polysaccharide which contains L-arabinose, D-galactose, D-mannose, and D-xylose and D-glucuronic acid (48) and has a molecular weight of approximately 12,000. On dispersion in water, gum ghatti forms viscous solutions of viscosity intermediate between those of gum arabic and gum karaya. These dispersions have emulsification and adhesive properties equivalent to or superior to those described for gum arabic. 

With a molecular weight for magnesium hydroxide of 58.3 g/mole, the solubility is equivalent to 8.36 mg per liter. The Bayer product Original Phillips Milk of Magnesia contains 400 mg of magnesium hydroxide per teaspoon (volume estimated at 5 mL) or 8.00 x 104 mg per liter. Clearly a saturated solution From the amount of dissolved Mg(OH)2, the pH of the solution can be determined, for... 

Table I. These are the amounts fed at the 2800-calorie level. Caloric intake was adjusted to the individual needs of the subjects by increasing or decreasing all foods the appropriate percentage to maintain each subject s weight during the study. Carbohydrate, fat, and protein made up 50, 37, and 13% of the total calories, respectively. The low fiber diet was supplemented with carotene, iron, magnesium, and copper in an attempt to make the two diets equivalent in all respects except fiber. During the last 7 days of each 26-day period, the subjects collected all urine and fecal sauries. Feces were marked by giving each subject 50 mg Brilliant blue. Seven-day cotqiosites of food, urine, and feces were prepared. Neutral detergent fiber (NDF) intake was 5 and 25 g/day on the low and higher fiber diets, respectively (18).

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