Electrolysis of Aqueous Solutions Flashcards

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In electrolysis, what does an aqueous solution mean?

It is a solution where a substance is dissolved in water.

What extra ions from water are always present in an aqueous solution?

Hydrogen ions (H+) and hydroxide ions (OH-) from the water.

During electrolysis of an aqueous solution, where do positive ions move?

Positive ions move to the negative electrode, called the cathode.

During electrolysis of an aqueous solution, where do negative ions move?

Negative ions move to the positive electrode, called the anode.

When you electrolyse dilute sulfuric acid solution, which gases form at the electrodes?

Hydrogen gas forms at the cathode and oxygen gas forms at the anode.

Why is dilute sulfuric acid added to water before its electrolysis?

It adds ions so the solution conducts electricity better, and the acid is not used up.

In electrolysis of copper(II) sulfate solution with inert electrodes, what forms at the cathode?

Copper metal is deposited on the cathode as a pink-brown solid.

In electrolysis of copper(II) sulfate solution with inert electrodes, what gas is made at the anode?

Oxygen gas is released at the anode from hydroxide ions in the water.

What happens to the blue colour of copper(II) sulfate solution during electrolysis with inert electrodes?

The blue colour fades because copper ions are removed from the solution.

What three useful products are made by electrolysis of concentrated sodium chloride solution (brine)?

Chlorine gas at the anode, hydrogen gas at the cathode, and sodium hydroxide solution.

How do you test for hydrogen gas made in electrolysis?

Hold a lit splint at the gas; hydrogen burns with a squeaky pop.

How do you test for oxygen gas made in electrolysis?

Place a glowing splint in the gas; oxygen relights the splint.

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