Water formula weight

The potassium salt is very slightly soluble in water (formula weight 268.36). The ammonium salt is readily soluble in water, very sightly soluble in alcohol. Shiny plates. Pyridine salt needles with a silken sheen, very soluble in water. 

Accurately weigh about 6 g NaCl and dissolve in distilled water. Pass the solution through a well-rinsed cation exchange column (Dowex 50W) in the hydrogen form. The equivalent amount of HCl is washed from the column (in 10 column volumes) into a volumetric flask and made up to volume. Equivalent weight is the formula weight. 

Common name Formula weight Melting poiut, °C Dissociation constants ia aqueous solution, 25°C AH° at 25°C kj / mol" Solubihty, g/100 g water Reference ... 

The solubihty of the ammonium haUdes in water also increases with increasing formula weight. For ammonium chloride, the integral heat of solution to saturation is 15.7 kj /mol (3.75 kcal/mol) at saturation, the differential heat of solution is 15.2 kj /mol (3.63 kcal/mol). The solubihty of all three salts is given in Table 1 (7). 

Melting point is recorded in a certain case as 82 d. and in some other case as d. 82, the distinction being made in this manner to indicate that the former is a melting point with decomposition at 82 C, while in the latter decomposition only occurs at 82 C. Where a value such as —2H2O, 82 is given it indicates loss of 2 moles of water per formula weight of the compound at a temperature of 82 C. 

Heat evolved, in Idlogram-calories per gram formula weight, on solution in water at 18 C. Computed from data in Bichowsky and Rossini, Theimochemishy of Chemical Substances, Reinhold, New York, 1936. 

The numhers represent moles of water used to dissolve 1 g formula weight of suhstance means infinite dilution and aq means aqueous solution of unspecified dilution. ... 

The theoretical percent of water in any hydrate can be calculated from atomic and formula weights. It is recommended that you perform this calculation and compare your results with this theoretically correct value. Try to account for any deviation. Since your sample of BaCl2-2H20 is as received, it may have additional water adsorbed due to room humidity. 

Normal and reverse phase Have a low formula weight (<2000) Are nonionic Are either polar or nonpolar Are water or organic soluble... 

Check formula weight of the lot of ATP you have and determine the amount required for 10 mL of a 100 mM solution. Add 8.5 mL distilled water to the determined amount and add 1 mL of IM MgS04 stock. Adjust pH to 7.0 distilled water to 10 mL. Disburse into 200-mL aliquots, and store at -20°C. 

The molarity is the number of moles (or gram formula weights) of solute in 1 liter of solution. This unit is the most convenient one for laboratory work. A solution of calcium chloride that is 0.5 molar (abbreviated with an uppercase M as 0.5M) contains one-half mole of CaClj (55.49 grams) in enough water to make the total volume 1 liter. 

In the two previous examples, the sucrose and santonic acid existed in solution as molecules, instead of dissociating to ions. The latter case requires the total molality of all ionic species. Calculate the total ionic molality of a solution of 50.0 grams of aluminum bromide (AlBr3) in 700 grams of water. Because the gram formula weight of AlBt3 is... 

The most significant dissolved ionic solid in most natural freshwater is calcium carbonate (actually present mainly as the bicarbonate), and so, for the purpose of water treatment, it is convenient to express the concentration of any ionic solute as a CaCOs equivalent. The formula weight of the solute is divided by the valence and by the number of its cations—for CaCOs itself, this comes to 50.0—and the concentration (usually in mg kg-1, ppm) is converted to an equivalent concentration of CaC03 on this basis.2... 

Assuming the volume of water in a typical frog is 100 mL, calculate how many grams of NaCl (formula weight (FW) 58.44) the frog must take up to make its tissues isotonic with seawater. 

Aluminum can accept two electrons to complete its octet. The pair of electrons is available from the halogen. An alkali halide can supply the electrons and form a complex (c), or the electron pair may come from the halogen of another aluminum chloride. Association with other aluminum halides accounts for the higher melting point of aluminum halides over antimony(lll) halides which have a formula weight of 95 or more. The association of aluminum sulfate, alkali metal sulfate, and water to form the stable alums is one of the more complex examples. 

CARBON SUBOXIDE. Cy02, formula weight 68.03, colorless, toxic, gas at room temperature, very unpleasant odor, sp gr 2.10 (air = 1.00). 1.24 (liquid at -87°C). mp — I07 C. bp 7°C (760 lorr). bums with a blue smoky Haute, producing CO . When condensed to liquid, the oxide slowly changes at ordinary temperature to a dark red solid, soluble in water to a red solution. Reacts with water to form malonic acid, with hydrogen chloride to form malonyl chloride, with ammonia to form malonamide. Made by heating malonic acid or its ester at 300°C under diminished pressure, and separation from simultaneously formed carbon dioxide and ethylene by condensation and fractional distillation. 

The simplest or lowest member of the fatly acid series is formic acid, HCOOH. followed by acetic acid, CHiCOOH. propionic acid with three carbons, butyric acid with four carbons, valeric acid with five carbons, and upward to palmitic acid with sixteen carbons, stearic acid with eighteen carbons and melissic acid with thirty carbons. Fatty acids are considered to be the oxidation product of saturated primary alcohols. These acids are stable, being very difficult [with the exception of formic acid) to convert to simpler compounds they easily undergo double decomposition because of the carboxyl group they combine with alcohols to form esters and water they yield halogen-subslitulion products they convert to acid chlorides when reacted with phosphorus pcntachloridc and Iheir acidic qualities decrease as their formula weight increases. 

It remains to be noted that, when there is no method available for ascertaining the formula weight or a compound, the simplest formula, based on chemical analysis and the use of symbol weighLs of the contained elements, is used, e g., ferric oxide, FejOj, ferroferric oxide, FejCXt, ferrous oxide, FeO, cupric oxide (black copper oxide), CuO. cuprous oxide (red copper oxide). CujO. The customary formula of water is H2O. which is correct ai temperatures above I00°C—actually, liquid water is mainly dihydrol (HjOh. 

FORMALDEHYDE. CAS 50-00-0], HCHO. formula weight 30.03. colorless gas with pungent odor, mp — 92 C, bp -2 °C, sp gr 0.815 (at —20"C). The gas is very soluble in H2O. alcohol, and ether. Formaldehyde usually is produced and marketed as a 37% (weight) solution in water. From 3 to 15% methyl alcohol normally is added as a stabilizer 10 prevent paraformaldehyde formation. The commercial trend is 10 furnish a more concentrated product (up 10 50% HCHO hy weight) which contain as... 

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