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+ Precipitation
+ Chemistry
+ Hydrochloric acid
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Abubakar Sadiq

Why does HCl cause precipitate?

Mark Evely  Follow

Group 1 cations, Pb^2+, Ag^+, Hg2^2+ are precipitated as their chlorides by dilute HCl. It is because, their ionic products exceed the solubility products.

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Claudio Delise  Follow

First it's soluble in water just like NaCl and KCl… note that these 3 cations H+, Na+ and K+ do not form precipitate at all unlike Ca2+, Zn2+, Al3+ etc. This is why HCl, NaCl and KCl are used to precipitate insoluble chlorides.

Moreover, it's the Cations of lower metals that forms precipitates with chloride ion of the HCl..Cations such as Pb2+, Act will form precipitate with HCl. So it's not the HCl itself but because the chlorides of Pb and Ag are insoluble. They are prepared as precipitates and extracted from solution through filtration

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