buffers are used as colored indicators in acid base titrations

Acid Base Titrations and Indicators - Titration is an operation for the measurement of quantities of substances in solution by the method of 'volume analysis'. This process involves adding a solution of the reagent of known concentration (standard s..

Titration is an operation for the measurement of quantities of substances in solution by the method of 'volume analysis'. This process involves adding a solution of the reagent of known concentration (standard solution), taken in a burette (called 'titrant'), to an unknown solution ..

This type of titration is carried out between acetic acid and sodium hydroxide. The free H + ion from the weak acid is neutralized by OH - ions from the base and there is a small increase in pH. Around the equivalence point large increase in pH is observ..

When we add a solution of NaOH to the solution of HCl, the pH progressively increases. This is because OH - ions from the base will react with H + ions of the acid to form water. This decreases the concentration of H + ions and therefore pH increases. The pH of the solutio..

In acid base titrations, a base is added to an acid successively (or vice versa) and the pH of the solution is noted after every addition. The plot of pH against the amount of base (or acid) added is called a titration ..

Buffers - Certain solutions, such as that of ammonium acetate, have a tendency to resist any change in its hydronium ion concentration or pH, whenever a small amount of a strong acid or a strong base is added to it. This property of a solution is known as buffer..

Certain solutions, such as that of ammonium acetate, have a tendency to resist any change in its hydronium ion concentration or pH, whenever a small amount of a strong acid or a strong base is added to it. This property of a solution is known as buffer actio..

A buffer solution containing a large amounts of a weak acid, and its salt with a strong base, is termed as an acid buffer. Such buffer solutions have pH on the acidic side i.e., pH is less than 7 at 298 K. The pH of an acid..

Indicators are the chemicals that when added to solutions show whether the solution is acidic or basic, by a sudden change of their colour. The common indicators used and the colour changes observed are mentioned belo..

With ordinary acid-base indicators the, colour change is not sharp and abrupt, but it extends over 2 units of pH. In order to have sharp colour change over a narrow and selected range of pH, a mixture of indicators are used. The pK I n d values of these h..