What is Vinegar?

                                             What is Vinegar?

Vinegar is used widely in kitchens nowadays. But actually its an acid.
Vinegar is a liquid substance consisting mainly of acetic acid ( CH3CO2H) and water . It is today widely used in kitchens as a general cooking ingredient . It is the most easily available mild acid . It has a great variety of industrial , medical and domestic uses.
It can also be used as a general household cleanser. White vinegar , since it is acidic , it can dissolve mineral deposits from glass and other smooth surfaces. For most uses , dilution with water is recommended for safety . Vinegar is also used to remove cigarette smoke residue from windows and surfaces .

                                                                                                 

What is hard water ?

                                     What is hard water ?

Water described "hard" is high in dissolved minerals especially Calcium and Magnesium . Hard water is not only a health risk but also a nuisance because of mineral build up on fixtures and poor soap and detergent performance as it is hard to get foam.
Water is a good solvent and picks up impurities quickly . As water moves through soil and rock , it dissolves small amount of minerals and holds them in solution. Calcium and Magnesium sulphates are the two most common minerals that make water "hard" .
The degree of hardness becomes greater as the calcium and magnesium content increases. We can add washing soda ( Sodium Carbonate ) to make it to lose its hardness. 

Symptoms that may indicate AIDS

                                         Symptoms that may indicate  AIDS

AIDS is the acronym for Acquired Immuno Deficiency Syndrome .  It is a disease of the human immune system caused by the Human Immunodeficiancy Virus (HIV)
During the initial infection , a person may feel a brief period of influenza like illness . This is typically followed by a prolonged time without symptoms. As the illness progresses , it interferes more and more with the immune system , making people much more likely to get infections.
There is no cure or vaccine for the disease ; however anti retro viral treatment can slow the course of the disease . But these medications are costly and may be associated with side effects. HIV originated in western central Africa during the early twentieth century.
People with AIDS , have an increased risk of developing various virus induced diseases . The patients have systematic symptoms such as prolonged fevers , sweats ( particularly at night ) , swollen lymph nodes , chills , weakness , and weight loss .

Lunar facts

                                                    Lunar facts

Lunar facts means facts about moon. We all know moon is the natural satellite of earth.
1. We see moon glowing in the sky. But moon isnt producing any light. He is just reflecting the sunrays that fell on him.
2. Lunar eclipse always happen on full moon days.
3.  Only one face of moon is visible from earth as the direction of revolving of both moon and earth are in the same way.
4. Upto 59 % of area of moon is visible from earth.
5 . Moon is going outwards from earth day by day.
6. Astronaut Kalpana Chawla's name has been put to crater of moon.

Hydrochloric acid

                                   Hydrochloric acid

Hydrochloric acid has the chemical formula HCl. It is used in our chemistry labs . It is corrosive and should be handled with care.
The acid can be found naturally occuring in the stomachs of many animals as a relatively weak solution. Excess hydrochloric acid in the stomach may cause dyspepsia. 
Hydrochloric acid does not contain any organic molecules , hence is regarded as a mineral acid. It is an aqueous solution of hydrogen chloride , which when in a saturated form contains about 43 % of hydrogen chloride. The aqueous solution is a strong electrolyte.
It disassociates to give H + and Cl - ions. Ionization is so much complete that the acid is considered as strong acid. Since it is a corrosive acid , it can be used to clean the metal surfaces. It is also a strong electrolyte, proton donor and also an acid.