Write an account of buffer solutions.

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F7 Essay Writing (Buffer Solution)

Q.        Write an account of buffer solutions.

Guidelines:        In your answer you should consider, giving examples,

                                (a)        definition

                                (b)        their compositions

                                        ---        weak acid and its salt (acidic buffer), e.g. CH3COOH / CH3COONa

                                        ---        weak base and its salt (basic buffer), e.g. NH3 / NH4Cl

                                (c)        how they work

                                        ---        equilibrium shift after addition of a small amount of strong acid /                                                 strong base to buffer,

                                        ---        resistance to pH change upon addition of small amount of

                                                acid / base

                                (d)        their applications

                                        ---        for checking indicator solution and calibrating pH meters

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                                        ---        for controlling solution pH for chemical / biochemical reactions,

                                        ---        for preserving food

                                (e)        their importance in nature

                                        ---        maintenance of blood pH

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~ Sample Essay ~

A buffer solution is one which resists changes in pH when small amounts of acid or alkali is added to it.  It plays an important role in chemical processes where it is essential that a fairly constant pH is maintained.  Buffer solutions could be classified into two types, namely acidic buffer and basic buffer solutions.

Acidic buffer solutions

An acidic buffer solution is one which has a pH less than 7.  They ...

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This is a highly detailed account with lots of correct equations and in depth chemistry. This is a 5* piece of work