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3. Suppose after adding HCl to ppt 16, you do not have any black solid. What, if anything, should you do to test for Co2 and
Qual Scheme: Group III: Co?(pink), N1 (green), Fet+ (yellow), Cr (blue-grey), Mn(pink), AP (colorless), Zn? (colorless). Un
SOLN WIS: Co (pink), Ni(green). Divide the solution equally into two TTs and treat one TT according to (a) and the other TT
b) Clg and discard H,0. Add 5 dps 6M HCl and heat to dissolve. Divide the soin into two parts (1) and (2): (1) Cool and add 1
SOLN W24: Zn. SOLN #24 is too weak to test for Zna. Test using the original unknown below. Test for Zn2+ on the original unk
Flow Chart Separation of Ions for Unknown B H2S, NH,OH, NH C1 PLA PRES Y P b rown SCOM)3, Al(OH)3, CE(OH)3, cos, Nis, Mns, an
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3. The presence of Co2+ in a sample can be ascertained by a simple test. The sample solution is acidified with HCl and a solution of potassium nitrate, KNO2 is added to the acidified solution. If Co2+ is present in the original sample, then a yellow precipitate of potassium hexanitritocobaltate (III), K3[Co(NO2)6] appears. This simple test is a confirmatory test for the presence of Co2+ ion in the sample.

The presence of Ni2+ in the original sample can be tested by dissolving the sample in ammonia, NH3 solution. Dimethylglyoxime, dmg can be added to the ammoniacal solution when a rose red precipitate of nickel dimethylgloyximate (II), [Ni(dmg)2]2+ is obtained.

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