Which reagent is used in the qualitative anal | vedclass

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(A) In the qualitative analysis of inorganic salts,cations are classified into different groups based on their solubility products and the common ion

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$H_2S$ in the presence of $NH_4OH$

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(A) In the qualitative analysis of inorganic salts,cations are classified into different groups based on their solubility products and the common ion effect.Group $IV$ cations $(Co^{2+}, Ni^{2+}, Mn^{2+}, Zn^{2+})$ are precipitated as their sulfides.The reagent used for Group $IV$ is $H_2S$ gas in the presence of an ammoniacal solution (buffered with $NH_4Cl$ and $NH_4OH$).This provides a high concentration of $S^{2-}$ ions,which is necessary to exceed the solubility product of Group $IV$ sulfides.

Which reagent is used in the qualitative analysis of Group $IV$ cations?

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