cation tests

CATION TESTS WITH CORRECT ANSWERS

Cu2+ v- vCORRECT✅✅Addition vof vNaOH vaq
turquoise vppt vof vCu(OH)2

Cu2+ v- vCORRECT✅✅Addition vof vammonia vNH3 vaq
turquoise vppt vof vCu(OH)2 vforms
soluble vin vexcess v= vdark vblue vsolution vof v[Cu(NH3)4(H2O)2]2+

Fe2+ v- vCORRECT✅✅Add vNaOH, vgreen vprecipitate vof vFe(OH)2

Fe3+ v- vCORRECT✅✅Add vNaOH, vorange vprecipitate vof vFe(OH)3

Mn2+ v- vCORRECT✅✅Add vNaOH, vpink/pale vbrown vppt vof vMn(OH)2

Mn2+ v- vCORRECT✅✅Add vNH3 vaq vpink/pale vbrown vppt vof vMn(OH)2

Cr3+ v- vCORRECT✅✅Add vNaOH, vgrey-green vppt vof vCr(OH)3
in vexcess vdark vgreen vcomplex vion v[Cr(OH)6]3-

Cr3+ v- vCORRECT✅✅Add vNH3 vaq, vgrey-green vppt vCr(OH)3
excess v= vpurple vsolution vof v[Cr(NH3)6]3+

NH4+ v- vCORRECT✅✅Warm vwith vaqueous valkali v(eg vNaOH) v
test vvapours vwith vdamp vred vlitmus
turns vblue vwith vammonia vgas