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Fejk Info z Chemi
Fejk Info z Chemi
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Wymień kationy grupy III
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Al3+, Cr3+, Fe2+, Fe3+, Co2+, Ni2+, Mn2+, Zn+
Wymień kationy grupy IV
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Ba2+, Ca2+, Sr2+
Wymień kationy grupy V
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Na+, K+, NH4+, Mg2+
Wymień odczynnik grupowy grupy III
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H2S, lub AKT w roztworze NH3(aq) i NH4Cl
Wymień odczynnik grupowy grupy IV
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(NH4)2Co3 w NH3(aq) i NH4Cl
Wymień odczynnik grupowy grupy V
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Nie ma odczynnika grupowego
GR. 3 Co2+
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Co2+ + S2- = CoS(osad czarny)
GR. 3 Ni2+
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Ni2+ + S2- = NiS(osad czarny)
GR. 3 Fe2+
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Fe2+ + S2- = FeS(osad czarny)
GR. 3 Fe3+
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2Fe3+ + 3S2- = Fe2S3(osad czarny)
GR. 3 Mn2+
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Mn2+ + S2- = MnS(osad cielisty)
GR. 3 Cr3+
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2Cr3+ + 3S2- + 6H2O = 2H2S(gaz) + 2Cr(OH)3(osad szarozielony)
GR. 3 Al3+
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2Al3+ + 3S2- + 6H2O = 2H2S(gaz) + 2Al(OH)(biały osad)
GR. 3 Zn2+
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Zn2+ + S2- = ZnS(osad biały)
Reakcja Vogla
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Służy do wykrywania jonów Ni2+ i Co2+. Wzór: Co2+ + 4SCN = [Co(SCN)4]2-. Przy obecności jonów Co warstwa organiczna zabarwia się na niebiesko
Kolory cieczy w grupie 3(co oznaczają)
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Szaro-niebieska - Cr3+: szaro-zielona - Fe2+: herbaciana - Fe3+: zielona - Ni2+: rózowa - Co2+
GR. 4 Ba2+
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Ba2+ + (CO3)2- = BaCO3(osad biały)
GR. 4 Sr2+
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Sr2+ + (CO3)2- = SrCO3(osad bialy)
GR. 4 Ca2+
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Ca2+ + (Co3)2- = CaCO3(osad biały)
Próby płomienne grupy 4
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Ba2+ - płomień zółtozielony: Sr2+ - płomień karmionowoczerowny: Ca2+ płomień ceglastoczerowny
GR. 5 Na+
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K[Sb(OH)6] + Na+ = K+ + Na[Sb(OH)6](osad krystaliczny biały)
GR. 5 K+
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K+ + (ClO4)- = KClO4(bialy krsytaliczny osad)
GR. 5 (NH4)+
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(NH4)+ + OH- = NH3(gaz) + H2O
GR. 5 Mg2+
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Mg2+ + 2OH- = MG(OH)2(osad galaretowaty biały)
Próba płomienna grupy 5
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K+ - płomień jasnofioletowy
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