In traditional black-and-white photography, the developed film is chemically "fixed" to prevent the unexposed light-sensitive material from turning black. This involves washing the film with a hypo so

Question

In traditional black-and-white photography, the developed film is chemically "fixed" to prevent the unexposed light-sensitive material from turning black. This involves washing the film with a hypo solution ($Na_2S_2O_3$). What is the exact formula of the soluble transition metal complex formed to clear the film?

Prashant Kotian · Accepted Answer

Correct answer: A. Hypo () acts as a fixing agent. It utilizes the complex-forming ability of transition metals, reacting with the insoluble, unexposed Silver Bromide () to form the highly water-soluble coordination complex Sodium dithiosulphatoargentate(I), mathematically written as .

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