Experimental method
1. Put the solution into the test tube small 3 tubes as follows.
The tube 1 solution Fe (, 2) s (III) nitrate (Fe (NO3) 3) 0.05 mol / dm3 5 drops.
The tube 2 aqueous ammonium sulfate II Fe (, 2) s () () () (NH4 2Fe SO4 2) 0.05 mol / dm3.
5 drops.
The tube 3 iodine solution in ethanol 5 drops.
2. Solution dropping ammonium thiocyanate (NH4SCN) 0.5 mol / dm3 into a solution.
3 tube, and observe the changes 1 drop record.
3. The small test tube again 3 tube solution with 3 type like an 1 but drops.
Potassium cyanide solution Haig. No ferrets (III) (K3Fe (CN) 6) 0.5 mol / dm3 tubes each 1.
Drop, observe the change record.
4. The small test tube again 3 tube solution with 3 type like an 1 but drop flour tube it 1 drops, observe the change record.