STANDARDIZATION OF HYDROCHLORIC ACID BY DISODIUM TETRABORATE
... Why is hydrochloric acid not a good “primary standard”? Because the hydrochloric acid is a volatile acid. ... So, the concentration of hydrochloric acid is not reliable. ... There may have some impurities reacted with hydrochloric acid to make the volume of acid used more. ... With reference to the pH range of an acid-base indicator, explain with the help of titration curves, why methyl orange, rather than phenolphthalein, is being used in the titration.