Prepare 0.1N HCl in 500mL of Distilled Water

Transfer using a graduated pipette 4.5 ml of concentrated hydrochloric acid (HCl) into a 500 ml volumetric flask containing 300 ml of water, Cool and dilute to 500 ml. 

This will give a solution of approximately 0.1(N) hydrochloric acid.

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Standardization of 0.1 N HCl (Hydrochloric Acid)

Pipette out 25 ml of the acid solution to a 250 ml conical flask and add 2 drops of methyl red or methyl orange indicator. 

Titrate with standard 0.1 (N) sodium hydroxide solutions taken in a burette till the colour becomes faint yellow or orange for methyl red and methyl orange respectively.
 
Normality of HCl acid solution   =  Vol. in ml of standard NaOH solution x Normality of NaOH
                                                                Vol. in ml of hydrochloric acid solution