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Back titration of ammonium chloride

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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.
What does this mean? I have done the calculation. here are the results:
Volume of hcl used=23.50ml
Moles of NaOH=.001773
Moles of NH4CL=0.02216
Gram of NH4CL=237g/L

What does this all means.

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The expert examines back titration of ammonium chloride.

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In pure water, there are always small amounts of hydrogen ions and hydroxyl anions present. These arise from the partial ionization of water:

An acid is any substance which, when dissolved in water, tends to increase the amount of H . In this example, it is hydrochloric acid:

A base is defined to be any substance which, when dissolved in water, tends to increase the amount of hydroxide. In this ...

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