Chromium and cadmium can be removed from waste water by treatment with sod
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net equation for the removal of Cr3+
Cr3+(aq) + 3 OH-(aq) ---> Cr(OH)3 (s)
for the removal of Cadmium
Cd2+ (aq) + 2 OH- (aq) ----> Cd(OH)2 (s)
Both of these ions should produce a precipitate which could be filtered out when reacted with NaOH
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