What is made when electricity is passed through brine?
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
- What is made when electricity is passed through brine? Write the equation and say where each product forms.
- Give one use of each product.
- In the factory cell, a membrane keeps the two sides apart. Why is this needed?
Need a reminder? The key ideaShow
A salt has the positive ion of a base and the negative ion of an acid. Strong acid + strong base gives a neutral salt; strong acid + weak base, an acidic one; weak acid + strong base, a basic one. Electrolysis of brine gives NaOH, and .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) . Chlorine at the anode, hydrogen at the cathode, sodium hydroxide near the cathode.
Step 2. (b) Chlorine: water treatment and PVC. Hydrogen: fuel and ammonia. Sodium hydroxide: soap and paper.
Step 3. (c) Chlorine would react with the sodium hydroxide, so the products must be kept apart.
Answer: as above.
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