Back titration of ammonium chloride

In a labratory. A solution of Ammonium chloride was given, for us to find the concentration by techniques of back titration. NaOH was added to the diluted ammonium chloride and heated. Then Titrated with HCL adding few drops of bromocresol green indicator. Colour turned yellow.

the general procedure was:

1. Weigh accurately the sample and place in a 250 ml volumetric flask then use

2 .25 ml of NaOH in a pipette for the titrations

3.Pipette 50 ml of standard sodium hydroxide into three 25ml conical flask followed by 25 ml, by pipette, of the solution of the ammonium salt.

4. After boiling, titrate against standardized HCl solution


Molarity of NaOH= 0.0948M

Mass of Ammonium salt – 1.3257g

1st Titration of NaOH and HCL

Burette reading – 24.95 ml

2nd Titration of NaOH (excess) and HCL

Burette reading = 24.6 ml


1.the concentration of the ammonium ion in the solution as molarity g/L-1

2. calcualte the percentage of ammonium salt

3. suggest how you can determine a mixture of hydrochloric acid and ammonium chloride in a solution