Buffer solutions A solution having feed-throwed constant pH and which register to change in its pH on addition of small amount of strong acid or strong base or on dilution with water Pepsal buffer Buffer solution is two types Acidic buffer, basic buffer Acidic buffer means having pH is less than 7 It is prepared by mixing appropriate amount of weak acid and is solved with strongness Acidic buffer, pH is equal to pKa plus log concentration of salt divided by concentration of acid That is pK is equal to minus log KM Basic buffer, it having pH is greater than 7 It is prepared by mixing appropriate amount of weak base and is solved with strong acid pH is equal to pKb plus log concentration of salt divided by concentration of base pKb is equal to minus log Kb