A base is a substance which releases hydroxyl ion (OH-). Bases are also known as alkalis and physically they are soapy and bitter in taste. In litmus paper test, they give blue color. An acid on the other hand is a substance which releases a proton or Hydrogen ion (H+). Acid and base both react to form a salt and the process is known as neutralization reaction. We have a pH scale which has a range from 0 to 14. If a substance has a pH more than 7 then that means it is a base but if a substance has pH less than 7 then the substance is acid.
One of the examples of base is sodium hydroxide (NaOH) which dissociates into Na+ & OH- to release OH-.
