A cold aqueous solution of sodium chloride is electrolyzed using a graphite anode and an iron cathode. In the course of the electrolysis the electrolyte is continuously stirred. The liquid left after electrolysis will therefore consist of?
sodium hydroxide solution
chlorine water
pure water
sodium hypochlorite solution
hydrochloric acid solution
Explanation
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Wrong
Cl will be deposited at d graphite anode (preferential discharge due to electrode used) while H will b liberated at d cathode,leaving Na and OH behind
Sodium Hydroxide solutn,dats a method of preparation of NaOH
Myschool is wrong
A is the answer. During the electrolysis of aqueous solution of sodium chloride. At the cathode, we have H+
and Na+. But H+ will b preferentially discharged and liberated at the cathode. At the anode, we have OH- and
Cl-. But Cl will be preferentially discharged since OH- and Cl- are close to each other. Cl- is liberated at the
anode. This leaves out Na+ and OH- in the electrolyte making the electrolyte alkaline.
More proof
The electrolysis of an aqueous solution of sodium chloride (NaCl), also known as brine, involves several reactions. At the cathode, water can be reduced to hydrogen gas, and at the anode, chloride ions can be oxidized to chlorine gas.
However, the water itself can undergo reduction and oxidation reactions at different potentials. So, the substance that is oxidized or reduced is not sodium and chloride ions alone, but it may involve the water molecule also.
During the electrolysis, hydrogen and chloride ions are removed from the solution, whereas sodium and hydroxide ions are left behind in the solution. This means that a solution of sodium hydroxide (NaOH) is also formed during the electrolysis of the sodium chloride solution³.
Therefore, the liquid left after the electrolysis of a cold aqueous solution of sodium chloride would be a **sodium hydroxide solution**. So, the correct answer is **A. sodium hydroxide solution**.
The electrolysis of sodium chloride in aqueous solution with a graphite anode and an iron cathode would produce sodium hydroxide at the cathode and chlorine gas at the anode. The liquid left after electrolysis would consist of sodium hydroxide solution, so the correct answer is A. sodium hydroxide solution.
The electrolysis of an aqueous solution of sodium chloride (NaCl), also known as brine, involves several reactions. At the cathode, water can be reduced to hydrogen gas, and at the anode, chloride ions can be oxidized to chlorine gas.
However, the water itself can undergo reduction and oxidation reactions at different potentials. So, the substance that is oxidized or reduced is not sodium and chloride ions alone, but it may involve the water molecule also.
During the electrolysis, hydrogen and chloride ions are removed from the solution, whereas sodium and hydroxide ions are left behind in the solution. This means that a solution of sodium hydroxide (NaOH) is also formed during the electrolysis of the sodium chloride solution³.
Therefore, the liquid left after the electrolysis of a cold aqueous solution of sodium chloride would be a **sodium hydroxide solution**. So, the correct answer is **A. sodium hydroxide solution**
