Blueprint paper: Some Reactions only occur when provided with light. Such reacti

Question

Blueprint paper:

Some Reactions only occur when provided with light. Such reactions are the basis for photoimaging. In a dark part of the lab, mixed about 6 mL of 0.5 M sodium citrate (relation to citric acid?), 5 mL of 0.3 M Fe(NO3)3, and 3 mL of 0.1 M ferricyanide in a small beaker. Using a piece of paper, brush this solution on a piece of white paper. Then, place several coins, a key, and a pencil on the paper and place the paper in the sunlight for 5-10 mins. The areas exposed to light should become blue. Wash the paper in running water and allow to dry to fix the image. Write the overall balanced equation for the reaction. Note that the half reaction involving citrate is (not balanced):

H(C6H5O7)2- + hv---> (CH3)2CO + 3CO2 + 2e-

H+ citrate light acetone

Explanation / Answer

The blue print formed is called turnbulls blue. This chemical is widely used in dying and pigment industries. You can read about more on wiki page of prussian blue. https://www.wikiwand.com/en/Prussian_blue

Sodium Citrate: Na2H(C6H5O7)
ferricyanide: [Fe(CN)]3

Na2H(C6H5O7) + 3[Fe(CN)]3 + 4Fe(NO3)3 ----> FeIII[FeIIIFeII(CN)6]3 + (CH3) 2CO + 3 CO2

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