Question

What is the reaction scheme for the following reaction: 2-3 crystals of K2Cr2O7 are dissolved in 1mL of concentrated H2SO4. This mixture is heating until It’s boiling. Then, 0.5 grams of the inorganic, monatomic anion of fluorine with the chemical formula F− is dissolved in the mixture.

Answer 1

2-3 crystals of K₂Cr₂O₇ are dissolved in 1mL of concentrated H₂SO₄. This mixture is heating until It’s boiling.

K₂Cr₂O₇ + H₂SO₄ (concentrated) --> K₂SO4 + H₂O + 2CrO₃
CrO₃ + H₂O --> H₂CrO₄
On heating upto boiling point (Its an explosive reaction as chromium trioxide is forming)
4CrO₃ --> 2Cr₂O₃ + 3O₂

In normal conditions nothing will happen upon adding F- ion to above mixture.

Cr₂O₃ + F- --> CrF₅ + CrF₆ + CrO_xF_y   (all these substances are volatile. In plasma experiments these types of films will be produced)

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