Section X 



Solution Preparation 



Abbreviations and Terms 



Abbreviations 



ml. (cc) — milliliter, cubic centimeter 



gm. — gram 



mg. — milligram 



aq. — aqueous 



M — molecular solution, see below 



N — normal solution, see below 



Molecular Solutions (cowdrv, 1952) 



A molecular solution contains the molecular weight in grams of the 

 substance made up to 1 liter with distilled water. For example: M oxalic 

 acid (COOH)2-2HoO is 126 grams (molecular weight) in 1 liter of 

 water. 



MoleciUar ^veight expressed in grams is called the gram-molecular 

 weioht or mole. A millimole is 1/1000 of a mole. 



'o' 



Normal Solutions 



A normal solution contains 1 gram-molecular weight of dissolved 

 substance divided by the hydrogen equivalent of the substance (that 

 is, 1 gram equivalent) per liter of solution. N oxalic acid is half the 

 concentration of the M soliuion above. 



407 



