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Give the group number where the cation belongs 1. Mercurous(Hg2-) ion gives a white precipitate with 0.1 MHCI- 2. Bismuth (Bi3-) ion does not give a precipitate with HCI but gives a black precipitate with thioacetamide in the presence of HCI. 3. Ammonium (NH4*) ion does not give precipitate with any precipitating agent. 4. Magnesium (Mg²+) ion does not give a precipitate with HCI or thioacetamide but give a white solid product with NazCOa. 5. Cobalt (Co2+) ion does not give a solid product with HCl and thioacetamide unless the solution is treated with excess NH4OH.

Give the group number where the cation belongs 1. Mercurous(Hg2-) ion gives a white precipitate with 0.1 MHCI- 2. Bismuth (Bi3-) ion does not give a precipitate with HCI but gives a black precipitate with thioacetamide in the presence of HCI. 3. Ammonium (NH4*) ion does not give precipitate with any precipitating agent. 4. Magnesium (Mg²+) ion does not give a precipitate with HCI or thioacetamide but give a white solid product with NazCOa. 5. Cobalt (Co2+) ion does not give a solid product with HCl and thioacetamide unless the solution is treated with excess NH4OH.

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Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Give the group number where the cation belongs 1. Mercurous(Hg2+) ion gives a white precipitate with 0.1 MHGI. 2. Bismuth (Bi3-) ion does not give a precipitate with HCI but gives a black precipitate with thioacetamide in the presence of HCI. 3. Ammonium (NHe*) ion does not give precipitate with any precipitating agent. 4. Magnesium (Mg2+) ion does not give a precipitate with HCI or thioacetamide but give a white solid product with Na2COa. 5. Cobalt (Co2+) ion does not give a solid product with HCI and thioacetamide unless the solution is treated with excess NH4OH.
Transcribed Image Text:Give the group number where the cation belongs 1. Mercurous(Hg2+) ion gives a white precipitate with 0.1 MHGI. 2. Bismuth (Bi3-) ion does not give a precipitate with HCI but gives a black precipitate with thioacetamide in the presence of HCI. 3. Ammonium (NHe*) ion does not give precipitate with any precipitating agent. 4. Magnesium (Mg2+) ion does not give a precipitate with HCI or thioacetamide but give a white solid product with Na2COa. 5. Cobalt (Co2+) ion does not give a solid product with HCI and thioacetamide unless the solution is treated with excess NH4OH.
Group I (Ag+, Pb2+, Hg2+) cations produce insoluble chlorides so they can be precipitated with dilute HCI, while all other cations remain in solution. Group II (Cu2+, Bi3+, Cd2+, Hg2+, As3+, Sb3+, Sn4+) cations produce very insoluble sulfides (Ksp values less than 10-30) so they can be precipitated by low amounts of sulfide ion; this can be achieved by adding an acidic solution of H2S. Group III (A13+, Cr3+, Fe3+, Zn2+, Ni2+, Co2+, Mn2+) cations produce slightly soluble sulfides (Ksp values more than 10-20) so they can be precipitated by relatively high amounts of sulfide ion; this can be achieved by adding a basic solution of H2S. Group IV (Mg2+, Ca2+, Sr2+, Ba2+) cations, as well as all of the above groups, produce insoluble carbonates so they can be precipitated by the addition of carbonate once the ions of the first three groups have been removed. Group V (Na+, K+, NH4 +) cations do not precipitate with any of the above reagents. Moreover, you can supplement your knowledge on this by reading or researching about solubility rules.
Transcribed Image Text:Group I (Ag+, Pb2+, Hg2+) cations produce insoluble chlorides so they can be precipitated with dilute HCI, while all other cations remain in solution. Group II (Cu2+, Bi3+, Cd2+, Hg2+, As3+, Sb3+, Sn4+) cations produce very insoluble sulfides (Ksp values less than 10-30) so they can be precipitated by low amounts of sulfide ion; this can be achieved by adding an acidic solution of H2S. Group III (A13+, Cr3+, Fe3+, Zn2+, Ni2+, Co2+, Mn2+) cations produce slightly soluble sulfides (Ksp values more than 10-20) so they can be precipitated by relatively high amounts of sulfide ion; this can be achieved by adding a basic solution of H2S. Group IV (Mg2+, Ca2+, Sr2+, Ba2+) cations, as well as all of the above groups, produce insoluble carbonates so they can be precipitated by the addition of carbonate once the ions of the first three groups have been removed. Group V (Na+, K+, NH4 +) cations do not precipitate with any of the above reagents. Moreover, you can supplement your knowledge on this by reading or researching about solubility rules.
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