24.5 redox and qualitative analysis Flashcards by Preet Bajwa

Q

colour of MnO4-

A

purple

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Q

colour change in reaction of Fe2+ and MnO4-

A

purple to colourless

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Q

how is Fe2+ oxidised to Fe3+

A

react with MnO4- ions

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Q

reaction of Fe2+ and MnO4 -

A

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Q

colour of Mn2+

A

colourless

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Q

colour of Fe3+

A

orange-brown

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Q

colour of Fe2+

A

pale green

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Q

how is Fe3+ reduced to Fe2+

A

react with I-

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Q

reaction of Fe3+ and I-

A

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Q

colour change in reaction of Fe3+ and I-

A

orange-brown to brown

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Q

colour of Cr2O7 2-

A

orange

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Q

colour of Cr3+

A

green

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Q

colour of Cr2+

A

pale blue

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Q

how is Cr2O7 2- reduced to Cr3+

A

react with Zn

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Q

reaction of Cr2O7 2- and Zn

A

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Q

colour change in reaction of Cr2O7 2- and Zn

A

orange to green

Q

how is Cr3+ reduced to Cr2+

A

add excess zinc

Q

reaction of Cr3+ and excess zinc

A

Q

colour change in reaction of Cr3+ and excess Zn

A

green to pale blue

Q

how is Cr3+ oxidised to CrO4 2-?

A

react with H2O2

Q

Cr3+ colour

A

green

Q

how is Cu2+ reduced to Cu+

A

react with I-

Q

what is formed in this reaction?

A

CuI precipitate
brown solution

Q

colour of Cu2+

A

pale blue

Q

colour of CuI

A

white precipitate

Q

colour of I2

A

brown solution

Q

reaction of Cu2+ and I-

A

Q

what is Cu+ able to do?

A

as it is very unstable it is able to disproportionate into Cu and Cu2+ ions

so it is both oxidised and reduced

Q

reaction when Cu2O reacts with H2SO4

A