Friday, 6 June 2014

Basic-acid dosage

What is a dosage ?
Is to determine the amount of a chemical species.

how to make dosage?

hydrochloric acid assayed by a sodium hydroxide solution 
It is necessary to determine the concentration of the hydrochloric acid 
we will take a precise volume of solution (H+Cl-) 
to detect equivalence poured bromothymol blue.

Evolution of pH during dosage 

It is noted that the color is yellow at the start so that there is no acid,
then poured soda thus increasing pH (because disappearance of H + ions),
the solution turns blue, therefore the pH thereof is neutral,
it is called equivalence.