Exercises marked with (*) require further reading/search beyond the suggested texts.
3. (*) What is a buffer?
Answer:
A buffer solution is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa. It's used as a means of keeping pH at a nearly constant value in a wide variety of chemical applications. One example of a buffer solution found in nature is blood.
Sources:
Wikipedia - Buffer solution
Science is Fun
© 2015 Joao Meidanis