Dear Mariem Chalbi, bismuth trichloride easily hydrolyses in water to give bismuth oxide chloride, BiOCl (cf. the article cited below). In the presence of ammonia, hydrolysis will occur as well. However, BiCl3 is soluble in hydrochloric acid under formation of BiCl4– (see attached). It is also soluble in ethanol, diethyl ether, and acetone. I hope this helps.

Article Controlled synthesis of bismuth oxo nanoscale crystals (BiOC...

Please look at the following below links which may help you in your analysis:

https://www.alfa.com/en/catalog/017115/

https://www.americanelements.com/bismuth-chloride-7787-60-2

https://www.chemicalbook.com/ChemicalProductProperty_EN_CB3205675.htm

Thanks

thank you for your help!

Solubility of BiCl3 (also of BiOCl.H2O) in hydrochloric acid can be found at: A. Seidell,"Solubilities of Inorganic and Organic Compounds", 2nd ed., Van Nostrand Comp., New York, 1919, p. 150.

On the solubility of BiCl3 in liquid ammonia, see:Article Estimation of Solubility of Bismuth Compounds in Liquid Ammonia

The ammonium double salt (NH4)3BiCl6 has been described: https://materials.springer.com/isp/crystallographic/docs/sd_1414839