In qualitative inorganic analysis of basic radicals, solution is prepared in dil. HCl and then diluted with H2O before H2S gas is passed. Orange turbidity appeared in one case on dilution. Turbidity dissolves when we add HCl.
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Solution
Turbidity dissolves when we add HCldue to formation of antimony trichloride. SbOCl+2HCl⟶SbCl3+H2O