Redox titration, heavy chromium ion titration of ferrous ions: 1. Electrode: 213 type platinum electrode; 217 type calomel electrode 2. Electrode connection: Connect the 213 platinum electrode to the contactor, insert the contactor into the “measuring electrode†socket of the electrode socket converter, and connect the 217 type calomel electrode to the “reference electrode†terminal of the converter. Connect the instrument electrode socket. 3. Drop night: 0.0167mol / L ± 10% potassium dichromate Dropped night: Take 10 ml of ferrous sulfate at a concentration of 0.1 mol/L ± 10%, add 10 ml of 15% sulfuric acid, and dissolve in 50 ml of distilled water. 4. “pH/mV†switch is set to “mVâ€, “Setting†switch is set to “end pointâ€, and the “end point potential†potentiometer is adjusted to make the instrument display 590mV. 5. Set the “pre-control point†to “pre-control point†and adjust the “pre-control point†potentiometer to make the instrument display “90mVâ€. 6. Set the “Function†switch to “Autoâ€. Click on the “Titration Start†switch and the instrument will start titration. After the "end point" light is on, read the burette reading. House Improvement Items,Home Decoration,Home Items Organizer,Household Tools,Yard Storage Items OYEAL Global , https://www.oyeal-home.com