Wikipedy.com                                                                                           Online encyclopedia

   Home     Add article      About

 INDEX

 

Acids, interesting facts about acids

Acids are a group of chemicals that are known for their sour taste. Some of the acids are very dangerous. Sulphuric acid, for example, is highly corrosive - it can eat away most metals. And it will quickly burn into flesh and other living matter. Nitric acid and hydrochloric acid are two other acids that will attack most metals. These three strong acids are among the most important of all the chemicals used in industry - sulphuric acid especially.

Acids, facts about acids

Acids, interesting facts about acids

It is possible to tell whether a solution is acidic by testing it with blue litmus paper. Litmus is one of the substances called indicators. Any solution which changes the color of the litmus from blue to red is sure to contain some kind of acid. Red litmus paper (right) is unaffected by acids

Acids, bases and salts form three of the most important classes of chemical compounds. They are connected in the following way. An acid reacts with a base to give a salt and water. This is one of the fundamental rules in chemistry. Hydrochloric acid, for example, combines with sodium hydroxide (base) to form sodium chloride (salt) and water. Sulphuric acid combines with potassium hydroxide (base) to form potassium sulphate (salt) and water. In a similar way nitric acid reacts to produce a nitrate. One way acids and bases differ is in their action towards a litmus solution. Litmus is one of the substances called indicators, which have one color in an acid solution and another color in an alkaline solution. In an acid solution, litmus is red; in an alkaline solution it is blue.

Fruit, facts about acids

Acids, facts about acids

Most organic acids - those obtained from living things - are weak and generally harmless. In fact we eat them in the form of fruit and in vinegar (click to increase)

The three acids mentioned so far are inorganic compounds. There are also organic acids - those which contain carbon atoms. In general, organic acids are very much weaker than inorganic acids, and they are also very much more common. For example, vinegar is a weak solution of an organic acid called acetic acid. The sharp taste in citrus fruits such as lemons is caused by citric acid. When an ant stings us, it injects formic acid into the skin, which causes pain. Lactic acid causes the sourness when milk goes bad. Proteins, which living things need to build up tissue, are made up of amino acids.

You can read these articles also:

 
 

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U

V

W

X

Y

Z

 
   
   
 
 
   
 
   
   
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 
       

Wikipedy.com @ - Online Encyclopedia