InterviewSolution
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InterviewSolution
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Using `CO_(2), NH_(3),NH_(4)NO_(3)`, and `K_(2)CrO_(4)` as the only reagents, devise a qualitative analysis scheme for separating and identifying the following ions, which might all be present in the same mixture: `Ba^(2+), Ca^(2+), Mg^(2+), Na^(o+), Pb^(2+)`. Assume that each cation present is `0.10M`. Sate the conditions of `pH` and the reagent concentration which are required in each step. |
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Answer» `{:(Ba^(2+)),(Ca^(2+)),(Mg^(2+)),(Na^(o+)),(Pb^(2+)):}}underset(NH_(3)+NH_(4)^(o+))(_)underset(Pb(OH)_(2)(s))({{:(Ba^(2+)),(Ca^(2+)),(Mg^(2+)),(Na^(o+)):}})underset(NH_(3))(_){{:(Ba^(2+)),(Ca^(2+)),(Na^(o+)),(Mg(OH)_(2)(s)):}}underset(NH_(3))overset(CO_(2))(_){{:(BaCO_(3)(s)),(CaCO_(3)(s)),(Na^(o+)):}` `{:(BaCP_(3),,,,),(CaCO_(3),,,,):}}underset("acidity")rarrunderset(CrO_(4)^(2-))rarr{:(BaCrO_(4)(s),,,,),(Ca^(2+)(aq),,,,):}` The `pB^(2+)` ions is identified by acidified followed by treatement with chromate ion, upon which it forms a yellow solid precitate. The `Na^(o+)` is identifed by the intense yeellow flame it yields. |
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