Consider the unbalanced aqueous half reaction: CrO2- + OH- --> CrO42- 2 points H2O + e-
A half reaction that could be added to the half reaction above to make a complete redox reaction would be:
oxidation of sodium metal
oxidation of sodium ions
reduction of fluorine gas.
reduction of fluoride ions
A colorless solution is divided into three identical samples. The following points tests were performed on the three samples of the solution:
SAMPLE TEST OBSERVATION
1. Add H+ (aq) no change
2. Add NH3 (aq) no change
3. Add SO42- (aq) no change
Which ion could be present in the solution?
Ag+
Ba2+
Na+
Cu2+