Please enable JavaScript.
Coggle requires JavaScript to display documents.
color: is the solution is dark purple? - Coggle Diagram
color: is the solution is dark purple?
yes! Add NaOH
is it light green, pale?
yes! centrifuge and decant
no supernatant, Cr dissolves and decants
add pH 4
results in Cr3+ ions and Na+
no
add NaOH
centrifuge and decant
Cu and Co will form precipitates and stay in the bottom of the test tube
add NH3 and centrifuge and decant
Cu will transfer in decant since it dissolves as Cu(NH3)4^2+ and NH3
add pH 4 to get Cu3+ and Nh4+
Co will stay as supernatant in testable as Co(OH)2
add pH4 to get CO^3+
if decant transfers to another test tube this is Cr(OH)4-
is it bright blue?
yes
Cu2+
is it pink/red
Co2+