Let's look at the reaction that occurs between the hydrochloric acid and the caustic soda. This reaction is a acid-base reactionbetween one of the strongest acids and one of the strongest bases known. Interestingly, the result of the neutralisation of this reaction is table salt, depending on the reaction: HCl + NaOH => NaCl + H2O . This experiment is very simple, although it must be carried out with great care due to the exothermicity of the reaction and the dangerousness of the components involved. 
HCL AND NAOH REACTION
- We take hydrochloric acid, HCl, on the one hand, and sodium hydroxide, NaOH, on the other.
- Since these elements are dissolved in water in a %, when mixing them proportionally we have to take into account this % in the solution. For example, if we take hydrochloric acid at 50% and sodium hydroxide at 40%, for each part of acid we add, we have to add 1.20 (5/4) of sodium hydroxide.
- We take the proportions, which must be very exact, of both acid and hydroxide and put it in a container (glass, as high temperatures will be recorded).
- It measures the pH of the solution obtained. If this pH is not equal to 7 (see pH scale), the reaction is not neutralised and the proportions need to be adjusted.
- Once we get pH = 7, we can say that we have obtained a solution of salt and water.
- In order to obtain the salt, we would evaporate the water, which we will do in future experiments.
HYDROCHLORIC ACID AND SODIUM HYDROXIDE IN THE HOUSEHOLD
Hydrochloric acid is commonly found as a household cleaning product under the pseudonym Salfuman, as a paint stripper. Sodium hydroxide is commonly used to unblock pipes (caustic soda). The cleaning agents are dangerous when mixed together, reaction between bleach, ammonia and salfuman.
Why does the temperature change occur when adding sodium hydroxide?
Hello Valeria
When sodium hydroxide is added to water, it dissolves in an exothermic reaction, greatly increasing the temperature of the water.
Greetings 🙂
Because when caustic soda is added, an exothermic reaction takes place and heat is released.
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I caused a clog in a sink drain when I tried to unclog a previous clog with caustic soda.
The soda has solidified and it looks like I will have to break the kitchen wall and floor.
Before I leave, I want to try any solution.
Can I pour into the clogged pipe, with caustic soda, strong water which after reaction should produce common salt plus water, thus freeing the clog?
Will the material (PVC) of the pipe deteriorate?
Will there be any personal risks in the handling?
Hello
It is very risky to mix hydrochloric acid or strong water with caustic soda. One is a very strong acid and the other is a very strong base, and when they react they generate a very exothermic and violent reaction. In the video, very small quantities have been used. If anything, try a little acid, but very little, and see what happens. Maybe a little acid will dissolve the soda and you can unblock it, but use a very small amount as it is a very violent reaction with a high heat release.
Why does this happen?
Hi, have you tried it? I have the same problem... Did it work?
Hello, will the result (water and salt) also give me if the reaction is not neutralised?
I will experiment with different concentrations of these reagents and I don't think they will all neutralise. Thank you.
What happens if I put TEN DROPS OF CHLORHYDRIC ACID AND TEN DROPS OF SODIUM CHLORIDE IN ONE LITRE OF WATER AND I DRINK 125 MILLILITRES EVERY HOUR FROM TEN TO TWO IN THE AFTERNOON? THEY ARE FOOLING ME? THEY SAY THAT SOMETHING VERY HEALTHY IS GOING TO HAPPEN TO ME. IS IT TRUE? IT IS CAUSTIC SODA WITH SALT AND WATER? THANK YOU. BLESSINGS 💙 💙 💙 💙 💙 💙 💙 💙 💙
Hi, I would not take it without a detailed medical prescription. Both hydrochloric acid and caustic soda are very reactive compounds that can cause serious damage. If you don't know exactly what you are doing and the reaction or neutralisation that can occur, I would not touch either compound.
What would happen if you mix caustic soda and muriatic acid. What is the reaction? It is dangerous????
Hello, it is the same reaction as muriatic acid is another name for hydrochloric acid. They should never be mixed, it is the same reaction, very exothermic.
Hello, I work with the preparation and sale of domestic cleaning products and recently a customer who owns several metal fishing boats, asked me for a product based on Muriatic Acid and Caustic Soda to clean rust and snail formation on the boats. Is this combination possible for these purposes? Thank you
Hello could you tell me the exact quantities you used for the experiment.and one question I got the caustic soda but it is in a liquid not in a liquid?
Is this reaction considered a double substitution?
Hello: apart.
I work in a workshop in the metal sector. We have old machines that have rust on their casings, we are trying to remove the rust with salfumant 20 %, we get very good results but they rust again very quickly. We are trying after pouring the acid and rubbing it against the surface until the surface is well pickled to make a rinse with a solution of water with soda and also rub. But we don't get an optimal result. Is there an exact proportion to neutralise the acid with the base? Thanks
What temperature does the reaction reach?
It can be neutralised with water, can't it?