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Mansoura National University
Pharm D-Clinical Pharmacy Program Level 1 Pharm. Anal. Chem. 1 (PC 101)
3) If different precipitates can be formed:
• Salts with K are precipitated first and their precipitates are more stable
sp
[i.e: the salt is more insoluble (or less soluble) and more stable]
N.B.: This rule is not always obeyed in case of comparing salts which have different
number of ions
As the case when a non-symmetrical salt is compared with a symmetrical one:
{e.g. although K of Ag CrO is less than K of AgCl, Ag CrO is more soluble than AgCl}
sp 2 4 sp 2 4
…..WHY?
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