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INDICATOR OF NATURAL PH

A little previous information

What are acid and bases?

The acids and bases are two types of substances that of a simple way can be characterized by the properties that declare.
The acids:

  • they taste acid
  • they give a characteristic color to the indicators (to see more down)
  • they react with metals releasing hydrogen
  • they react with the bases in denominated process neutralization in which both lose their characteristics.

The bases:

  • they taste bitter
  • they give a characteristic color to the indicators (different from the one from acids)
  • they have a soapy tact.

THAT IT IS NEEDED

Mulberry cabbage
Water destiladabr> Receiving of glass
OriginalDustCover

blue dark

SECURITY NOTE


YOU DO NOT PROVE any acid or bases unless you have the absolute certainty that he is innocuous. Some acids can produce very serious burns. He is dangerous to even verify the soapy tact of some bases. They can produce burns.

In the table that follows they appear some current acids and bases:

homemade acids and bases

acid or bases

where one is

acetic acid

vinegar

salicílico acetil acid

aspirina

ascorbic acid

vitamin C

citric acid

juice of citruses

hydrochloric acid

salt fumante for gastric cleaning, juice, very corrosive and dangerous

sulfuric acid

batteries of cars, corrosive and dangerous

ammoniac (it bases)

homemade cleaners

magnesium hydroxide (it bases)

magnesia milk (laxative and antacid)

What is the pH?

The chemicals use the pH to indicate of form needs the acidity or basicity a substance. Normally it oscillates between the values of 0 (more acid) and 14 (more basic). In the table following it appears the value of the pH for some common substances.

pHs that present some current substances

substance

pH

gastric juice

2,0

lemons

2,3

vinegar

2,9

refreshments

3,0

it came

3,5

oranges

3,5

tomatos

4,2

acid rain

5,6

human urine

6,0

cow milk

6,4

it salivates (rest)

6,6

pure water

7,0

it salivates (when eating)

7,2

human blood

7,4

fresh eggs

7,8

water of sea

8,0

saturated dissolution
of sodium bicarbonate

8,4

it grazes of teeth

9,9

magnesia milk

10,5

ammoniac caretaker

11,5

What is an indicator?

The indicators are colouring organic, that they change of color according to are in the presence of an acid substance, or basic.

Homemade manufacture of an indicator

The cabbages of mulberry or violet color, contain in their leaves an indicator that belongs to a type of organic substances denominated anthocyanins.
In order to extract it:

  • It cuts some leaves (at the most dark better)
  • Cook them in a container with a little water during at least 10 minutes
  • It retires the container of the fire and to let cool it
  • It filters the liquid (it is possible to be done with an old fabric piece)
  • You already have the indicator (the filtered liquid)

The characteristics of the obtained indicator are:

extrhelpo indicator of mulberry cabbage.

color that it acquires

half in that it is

pink or red

acid

blue dark

neutral

green

basic

SECURITY NOTE


The ammoniac one is a POISON. It suitably identifies the container that contains it. You do not prove it and you do not leave it in a site where somebody could prove it by error.

Test of breathing (to crack a joke)

Give somebody a glass that contains a little water with extract of mulberry cabbage and some drops of homemade ammonia and asks to him that pajita of refreshment blows through one. You can present it as a test of alcohol, evil breath, etc. The dissolution will pass of green color blue emerald to dark. If now you add vinegar to him, the dissolution will acquire a red color.
When blowing we expelled dioxide from carbon (CO2) that in touch with the water forms carbonic acid (H2 CO3). This formed acid, neutralizes ammoniac one that contains the dissolution. When adding vinegar the solution acquires an acid pH

How to generate acid rain

It impregnates a strip of paper of kitchen in a dissolution of the extract of from Lombardy. It immediately approaches palito of phosphorus after igniting it. It is observed that it appears a red point (acid) in the strip of paper.

To what one is due? It can be due to carbon dioxide (CO2) generated in the combustion? No, the formed dissolution (carbonic acid) is not sufficiently acid as producing the red color. (A little can be verified repeating the experiment but letting burn the match before approaching it the paper). The cause of the appearance of the red color is in sulphur dioxide (UNDER2) that one forms when the match becomes inflamed. This is due to the sulphur presence (S) addition, among others products, at the top of palito of phosphorus, so that it ignites.

Sulphur dioxide in touch with the present water in the paper strip forms sulfurous acid (H2UNDER3) that he is more acid than carbonic acid

.
In the combustion of some petroleum products sulphur dioxide takes place that happens to the atmosphere. When raining and entering in touch with the water, one forms sulfurous acid, one of the people in charge of acid rain.


warnings








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