The chemical used as a ‘fixer’ in photography is (a) Sodium sulphate (b) Sodium thiosulphate

Question

The chemical used as a ‘fixer’ in photography is (a) Sodium sulphate (b) Sodium thiosulphate

The chemical used as a ‘fixer’ in photography is

(a) Sodium sulphate

(b) Sodium thiosulphate

(c) Ammonium persulphate

(d) Borax

Monjur Alahi

9 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

(b) Sodium thiosulphate is used in photography as a fixer. It removes Ag from negative by dissolving unexposed silver bromide resulting into formation of complex.

AgBr + 2Na₂S₂O₃→ Na₃ [Ag(S₂O₃ )₂ ] + NaBr

9 views Answered 2023-02-05 15:29