[د حنين]

[quote=روح الحيـاة;970042]التانى

why in gp.V add excess NH4CL before adding (NH4)2CO3

NH4CLـــــــــــ^-ـNH4+ + CL
NH4OHــــــــــ^-NH4^+ +OH
NH4)2CO3ـــــــ2NH4^+ +CO3^-2

we add NH4 excess to prevent ppt of gp 5 as hydroxides by dec.OH- we cant reach ksp of gp 5 ,therefore only ppt as carbonate by common ion effect (ammonium) to left hand side





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