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Hello everybody. We are going to begin a new lesson of chemistry and it's called

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Protons Transfer Reactions. We also call it Acid and Alkaline Reactions. We are going

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to dedicate this lesson to the students of the fourth course of secondary. We

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will also study this on the first and the second course in baccalaureate but

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now we are going to begin with the first concepts. We are going to see what

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is an arctic, what is an alkaline, what is the difference between both of them and

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we can work in the laboratory to see different substances. First of all we are

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going the difference between acid and alkalines. Acid is a compound

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that produces protons and alkaline is a compound which produces hydroxyl ions.

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As you can find in a lot of works, acid is a compound that tastes sour. Alkaline

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is a compound which tastes bitter.

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If I were you, I won't taste any of them because you can lose your tongue. So I

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prefer to give you another description. We will see there are strong and weak

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arctic and strong and weak alkaline stones. We use a scale from 1 to 14 and

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to see if a substance is an arctic or is an alkaline. We say an arctic has got a pH

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from 1 to 7 and an alkaline has a pH from 7 to 14. We can see here for example

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water has got pH 7 but ammonium has a pH of 6. So we can see that an arctic or a

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alkaline has an alkaline and an arctic has got an alkaline pH. Beer for example has

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an arctic pH. We can find an interesting process when we mix an arctic and an

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alkaline. We get salt and water. We are a involved in our everyday.

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with a lot of substance acid and basic and maybe we don't know for example in our stomach we have

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got hydrochloric acid that help us to make the digesting of the food we have some industries

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waste a lot of acid and it can be a problem in in our environment for example the the bees and the

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and the wasp they inject us some attic or some alkaline substance when we have a problem with

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them we

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use a special paper to to see if a if a substance is an acid or alkaline this paper change the color

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depending of the pH so we can find a strong red we can fight or an

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we can fight or an orange

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we can fight or an orange

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yellow with green dark blue depending on the on the compound we put on this paper

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and so we could see what happened with lemon juice with milk with water we saw

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or with ammonium from our houses we can see our lemon

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and the

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ากile

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has got our pH under seven keys as extra fermented milk alla take 2 it has a ph nearly 7 but is under

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seven if we see the pH of water weird cell will see its over seven so its a

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alkylene

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And if we see ammonia, it's also an important alkaline.

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Finally, we will say acid and alkaline are very, very important in our everyday,

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in the industry, in all the life, as I told you before, in our digesting.

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In the product we use to clean, in the feeding, in the environment.

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Remember the acid rain, which is a...

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destroys and deteriorates all the environment.

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So we have to take care about this.

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This is a rubric to evaluate your knowledge.

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And that's all. I hope you like it as I do. Thank you very much.

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Thank you.