Solutions of various chemicals used for testing purposes in qualitative analysis. They comprise strong hydrochloric, nitric, and sulphuric acids dilute solutions of the same acids and various salts containing about 5 per cent, of the respective substancesthat is to say, 5 grammes by weight per 100 c.c. dissolved in water. For use in the practice of volumetric analyses, solutions of known strength, or socalled “standard solutions,” are employed, the quantities of the constituents bearing the same relation to each other as the numbers which express their chemical equivalents. When they are made of such strengths. that a litre contains equivalent weights in grammesfor example, 365 grammes in 1,000 c.c.they are termed “normal standard solutions.”

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Definition of  REAGENTS