From the following list of cations, how many are precipitated as their sulphides when gas is passed — Qualitative and Quantitative Analysis Chemistry Question
Question
From the following list of cations, how many are precipitated as their sulphides when $H_2S$ gas is passed through a dilute $HCl$ acidic medium? $Pb^{2+}, Hg^{2+}, Bi^{3+}, Cu^{2+}, Cd^{2+}, Sn^{2+}, Zn^{2+}, Ni^{2+}, Co^{2+}, Mn^{2+}$
Answer: 6
💡 Solution & Explanation
The cations precipitated by $H_2S$ in acidic medium belong to Group II. From the list, $Pb^{2+}, Hg^{2+}, Bi^{3+}, Cu^{2+}, Cd^{2+},$ and $Sn^{2+}$ belong to Group II (Total = 6). $Zn^{2+}, Ni^{2+}, Co^{2+}, Mn^{2+}$ belong to Group IV and require a basic medium to precipitate.
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