Why do some scientists prefer to express concentrations of water contaminants in the units ppm and ppb rather than molarity?
1 answer:
Explanation:
These molarity units are used to express very small solute concentrations. Molarity cannot be used to express small amount of solute dissolved in solvents.
parts per million ppm is a dimensionless quantity that represents the part of a whole number in units of
parts per billion ppb represents the part of a whole in units of
These quantities are useful in determining very small amount of solute like gold concentration in stream sediments.
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Answer:
Reagent A: PBr₃
Reagent B: Mg in Et₂O.
Explanation:
Hello,
In this case, your facing a problem in which a carboxylic acid is produced starting by an alcohol. More specifically, cyclopentanol must react with phosphorous tribromide in order to yield bromocyclopentane which is more likely to produce a carboxylic acid, therefore, reagent A is PBr₃.
On the other hand, by means of the production of the specified product, bromocyclopentane must react with carbon dioxide and magnesium in diethyl ether in acidic media to promote the production of the cyclopentanoic acid via the grignard reaction (substitution of the bromine by the carboxyle group), therefore, reagent B is Mg in Et₂O.
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