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Chemical name of yellow precipitate for K2CrO4 + BaCl2 or Na2Cro4 + BaCl2 Chemical name...

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sheriff97 | Student, Grade 9 | Honors

Posted November 1, 2013 at 5:35 PM via web

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Chemical name of yellow precipitate for K2CrO4 + BaCl2 or Na2Cro4 + BaCl2

Chemical name of red precipitate for K2CrO4 + AgNO3 or Na2CrO4 +AgNO3

Chemical name of white precipitate  for NaOH + BaCl2 or Ba(NO3)2 + Na2SO4

What do color reactions have in common(ion)?

What does white reactions have in common?

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llltkl | College Teacher | Valedictorian

Posted November 1, 2013 at 6:10 PM (Answer #1)

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All the reactions are double displacement reactions, i.e. reactions where the anions and cations of two different molecules switch places, forming two entirely different compounds. The complete reactions are:

`K_2CrO_4 + BaCl_2 rarr BaCrO_4 (s) + 2KCl`

`Na_2CrO_4 + BaCl_2 rarr BaCrO_4 (s) + 2NaCl`

`K_2CrO_4 + 2AgNO_3 rarr Ag_2CrO_4 (s) + 2KNO_3`

`Na_2CrO_4 + 2AgNO_3 rarr Ag_2CrO_4 (s) + 2NaNO_3`

`2NaOH + BaCl_2 rarr Ba(OH)_2 + 2NaCl`

`Ba(NO_3)_2 + Na_2SO_4 rarr BaSO_4 + 2NaNO_3`

The chemical name of the yellow precipitate formed in the first two instances is Barium chromate.

Chemical name of the red precipitate formed in the next two reactions is Silver chromate.

Chemical name of the white precipitate formed in the reaction between NaOH and BaCl2 is Barium hydroxide and chemical name of the white precipitate formed in the reaction between Ba(NO3)2 and Na2SO4 is Barium sulfate.

In color reactions chromate ion (anion) is precipitated out of solution, while in white reactions barium ion (cation) is precipitated out.

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sheriff97 | Student , Grade 9 | Honors

Posted November 1, 2013 at 6:15 PM (Reply #1)

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Thank you so much... you are awesome! Have a great weekend!

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