Question

Chemical which are tested by the manufacturers showing the actual percentages of impurities and labeled on the containers are called ____.

a. certified grade

b. reagent grade chemicals

c. all of the choices

d. analytical reagent

Answer 1

Certified grade chemicals are those for which the purity standard is established by Fisher Scientific. Purity is guaranteed to meet published maximum limits of impurities

Reagent grade chemicals are around 96-98% pure normally. they are just fine for most synthesis applications. But we would not want to use it in pharmaceutical applications or anything that requires very pure chemicals

Analutical reagent grade chemicals used for high precision work. Trace impurities are restricted to lowest possible limits for high precision. Such reagents used mainly for analytical applications, research and quality control .

Generally. all of the above certified grade, reagent grade and analytical reagents showing the actual percentage of impurities and labeled on the containers. Whereas Cerifued grade are those which are tested by manufacturs so correct answer is (a).