Dipole electrode is located between two single-electrode. It can be one or more (it is one in this experiment). The one side of double-electrodes is positive and other side is negative. Each space between the plates is filled with asbestos diaphragm.
After the current being added, the electrolyte ions completed discharge and precipitated. Sodium chloride solution was electrolyzed.
Then a large number of bubbles in the electrolyte solution can be observed in precipitation. Stop it after the device running 1 hour (adding a small amount of fined sodium chloride to the solution every 10 minutes during the reaction). Shake the reacted liquid uniform and draw a small amount of reacted electrolyte solution. Then drop phenolphthalein test solution and the electrolyte solution immediately turned red. In addition, take appropriate amount of reacted electrolyte solution and use the titration method to measure the concentration of sodium hydroxide. Sodium hydroxide is about 11 grams in quality after calculation.
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