Potassium Dichromate

Practise balancing equations:

Direction:

In the following equations you will see a blank box before the symbol of each compound and element. Enter the lowest possible number in each box, or leave the box blank if you think the chemical needn't have a number (i.e. the number is equivalent to '1').
When you think the equation is balanced, click on the small button "Check answer" that appears below it.
If your equation is incorrect, then click the button "Reset" and try balancing the equation again.
In case you are in a hurry or are unable to balance, then click the button "Show answer."
If you want to know the time taken (minutes:seconds) to balance a chemical equation, you click the "Start" button and after balancing the equation, click the "Stop"button. Once, you have noted the time, click the "Reset Timer" button.

Note:

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Extraction of Potassium dichromate from chromite ore:

The process involves the following three steps:

Conversion of chromite ore into sodium chromate:
The chromite ore(FeCr₂O₄) is mixed with soda ash (Na₂CO₃) and quick lime. The mixture is then roasted in a reverberatory furnace in the presence of excess air when a yellow mass of sodium chromate is obtained.

FeCr₂O₄ + Na₂CO₃ + O₂ →Fe₂O₃ + Na₂CrO₄ + CO₂

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Conversion of sodium chromate into sodium dichromate:
The sodium chromate obtained from the above step is treated with concentrated sulphuric acid when it is converted into sodium dichromate.

Na₂CrO₄ + H₂SO₄→Na₂Cr₂O₇ + Na₂SO₄ + H₂O

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Conversion of sodium dichromate into potassium dichromate:
Hot concentrated solution of sodium dichromate is treated with a calculated quantity of potassium chloride and the mixture is allowed to cool when orange crystals of potassium dichromate is obtained.

Na₂Cr₂O₇ + KCl →Na₂Cr₂O₇ + NaCl

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