pH is a figure expressing the acidity or alkalinity of a solution on a logarithmic scale. 

The Latin name for acid is acidus, it means sour, sharp, or tart taste.

* Turns litmus paper red 

Another name for base is Alkali it means a chemical compound that neutralizes or effervesces w// acids and turns litmus acid. A base is Excesseds by carbon ions.     

* It is bitter

Battery acid is a very strong acid. It is so 

Hydrocholoric acid is a strong acid.  It is used in many different applications, including the production of chlorides, the refinement of ore and the production of metals like tantalum and tin. 

Gastric acid is a strong acid. Gastric acid, gastric juice or stomach acid, is a digestive fluid, formed in the stomach and is composed of hydrochloric acid (HCl)

Soda/ Orange juice is still considered a strong acid. These substances are usually made for drinking or to cook, like the juice. 

Acid soil is considered a weak acid. It is used for plants to make them grow faster.  

Pure rain is a weak acid. It can  be used for many different reasons such as to drink, or to water plants and to wash clothes.  

Egg yolk is a weak acid. It is used to cook up on a frying pan and is sometimes scrambles or sometimes its not.  

Pure water is neutral its in the middle. Pure water is used for drinking, bathing, washing dishes, etc...

Sea water is considered weak base.  Perhaps the newest use for sea water is wave-power technology.

Baking soda is a weak base. It is used to help whiten clothes, to cook, can be used as a healing medicine, helps clean skin, to clean inside of the mouth like rinsing it. It can aslo sometimes be used to wash dishes.  

Detergent is a base in between weak and strong. Detergent is used for washing clothes and sometimes for cleaning shoes. 

Household cleaners are somewhat strong bases. These are used everywhere around the house to clean counters, drawers, windows and more.  

Soapy water is a strong base. It is used to wash dishes or counters also sometimes to wash the car.  

Bleach is considered a strong base. It is used to get rid of stains on clothes. Also for toilet cleaning.  

Drain Cleaner is a strong base. It is used to clean drains.  

In my opinion i think that pure rain has one of the biggest effects on the environment because without it nothing would grow or people would not be able to gather water for specific things. Rain also cleans the streets and roofs from houses.  

 https://sciencelanguagegallery.wikispaces.com/KS3%20Acids%20and%20Alkalis