Why does the Ph increase of electrolytic CuCl2

Hello. The total equation for electrolysis of CuCl2.

Be. cucl2 == cu + cl2↑

The hydrolysis of CuCl2 is acidic, so the less CuCl2, the less acidic the solution, and the pH will increase.

And the total equation for electrolysis of NaOH is:

2h2o=2h2+o2

The less water there is, the greater the concentration of NaOH, the more alkaline the solution will be, and the pH will increase.

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1.The pH of the electrolytic NaOH solution increases. Because the essence is electrolyzed water, the concentration of hydroxide increases, so the pH of the electrolyzed NaOH solution increases.

2.The pH of the electrolytic CuCl2 solution increases. Because the essence is electrolytic CuCl2, the concentration of copper ions decreases, the degree of hydrolysis of copper ions in the original solution is weakened, and the acidity is weakened, so the pH of the electrolytic CuCl2 solution will increase

Electrolysis of CuCl2 solution produces copper and chlorine, the concentration of copper ions decreases, the concentration of hydrogen ions produced by hydrolysis decreases, the acidity decreases, the alkalinity increases, and the pH increases.

Electrolysis of NAOH Rongfeng also produces hydrogen and oxygen, which is essentially electrolysis of water, the concentration of sodium hydroxide increases, the alkalinity is enhanced, and the pH is increased.

You're wrong, right? The change of pH depends on what electrode you use, if you use an inert electrode such as a carbon rod, the situation is as follows: because the electron gain capacity Cu2+>H+, the electron loss ability Cl->OH-, so the electrolysis process consumes Cu2+ and Cl-, and the copper chloride concentration decreases, so theoretically the pH value should not change.

If you use an active electrode, it's a different story.

When CuCl2 reacts with Na2H2Y, CuCl2 reacts with Na+ in Na2H2Y and H+ in H2O to form Cu(OH)2 precipitate and NaCl and water. In this reaction, the concentration of H+ decreases, resulting in an increase in pH in solution.

Specifically, Cu2+ in CuCl2 reacts with Na+ in Na2H2Y to generate Cu(OH)2 precipitate and NaCl. At the same time, the H+ in H2O reacts with the Oh- in Cu(OH)2 to form water, which reduces the concentration of H+ and causes the pH value in the solution to rise.

Therefore, when CuCl2 reacts with Na2H2Y, CuCl2 will consume H+, which will reduce the concentration of H+ and cause the pH value in the solution to rise. This phenomenon is called"Acid-base neutralization", which is one of the common phenomena in chemical reactions.

The principle that Cu2O can also be prepared by electrolysis is shown in the figure on the right, then the anode electrode reaction can be expressed as 2Cu++2Oh--2E-=Cu2O+H2O, and the cathode electrode reaction can be expressed as 2H+ +2E-=H2 by adding the two formulas.

2cu++h2o-=cu2o+h2

There are no new OH and H ions generated, so the pH does not change.

1.When electrolyzing the CuCl2 solution, the cathode comes out of Cu and the anode comes out of Cl2, so the actual electrolytic is CuCl2.

Cu ions will combine with OH ions in water to form copper hydroxide, which is the initiation of blind hydrolysis, so chlorination is alkaline, so when Cu is precipitated, the pH increases, and the addition of CuCl2 can be restored.

Let's start with copper chloride.

The pH of the solution.

Copper chloride is a strong acid and weak alkali salt, so the copper chloride solution will show strong acidity due to the hydrolysis of copper ions.

Second, let's take a look at what happens during the electrolysis process. During electrolysis, copper ions on the negative electrode gain electrons to form metallic copper precipitates, and on the positive electrode, chloride ions lose electrons to form chlorine gas.

Run out of solution.

As electrolysis progresses, the copper chloride solution becomes thinner, the concentration decreases, the hydrolyzed copper ions decrease, and the corresponding hydrogen ions decrease, so the pH value rises.

1.When the electrolytic CuCl2 solution is copied, the cathode produces Cu and the anode produces Cl2, so the actual electrolytic is known as CuCl2.

Cu ions will combine with OH ions in water to form copper hydroxide, which is hydrolysis, and the way is alkaline by chlorination, so when Cu is precipitated, the pH increases, and CuCl2 can be restored.