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In coprecipitation the difficulty that most often spoils the product is

  • A.the low yield the reaction gives on repeated trials
  • B.the two cations precipitating at different pH values
  • C.the precipitate proving much too fine to filter cleanly
  • D.the need for an autoclave rated to high pressure

Answer: B

If one hydroxide comes down at pH eight and the other at pH ten, the early precipitate is rich in the first cation and the stoichiometry drifts through the run. Adding the reagents simultaneously into a buffered vessel is the standard remedy.

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