Write the net-ionic equation for the reactions that occur in these anion tests and include states of matter
a. Test for CO32- : Add 1 mL 6M HCL. Bubbles indicate CO2.
b. Test for SO42-
A white Barium sulfate solution means that the test is positive for SO42-
c. Test for PO43-
Balance the following:
Note: no oxidation-reduction occurs.
d. Balance using ion-electron method (in acid solution) to solve. Ion testing for=CrO42-
Starting rxns: Cr2O72-(aq)àCrO5 (aq) and H2O2 (aq)àH2O (l)
e. Testing for SCN-
Adding Fe(NO3)3, which will form FeSCN2+ if positive for thiocyanate. The product is aqueous (product of a Lewis acid base-rxn). A complex ion. Soluble.
testing for Cl-
Add nitric acid and AgNO3. Curdy white AgCl precipitate means positive for Cl-
Must use ion-electron method (in basic solution) to solve.
Reactants= Al, NO3-, OH-, and H2O
Products= NH3 and AlO2-
starting half reactions: Al(s)àAlO2-(aq)
and NO3-(aq)àNH3 (aq)
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