Question #bab14

1 Answer
May 22, 2015

A primary standard is a reagent that is stable, is extremely pure, has no water of hydration, and has a high molar mass.

Some primary standards are:

  • sodium carbonate, #"Na"_2"CO"_3#, for the titration of acids
  • potassium hydrogen phthalate (KHP), #"KHC"_8"H"_4"O"_4#, for the titration of bases
  • potassium dichromate, #"K"_2"Cr"_2"O"_7#, for redox titrations
  • sodium oxalate, #"Na"_2"C"_2"O"_4#, for redox titrations

A standard solution is a solution with an accurately and precisely known concentration.

It is prepared by using a primary standard.

It is often used to determine the concentrations of other substances by titration.

For example, you might prepare a standard solution of KHP to determine the concentration of a solution of #"NaOH"#.