Chemistry
Learning physics
and chemistry
easily and freely - Science for elementary school, middle school and
high school
Free online chemistry lesson for elementary school, middle school and high school.
Acidic and basic solutions
Composition of hydrochloric acid
As its name suggests, hydrochloric acid is an acidic solution.
A pH measurement confirms it: pH is lower than 7.
The acidity of a solution is linked to the presence of hydrogen ions (formula H+)
The word " hydrochloric "derives from " chlorine " which suggests that chloride ions are present in this solution.
To confirm it, a test for chloride ions may be realized:
A few drops of silver nitrate in hydrochloric acid leads to the formation of a white precipitate which means the test is positive.
Hydrochloric acid therefore contains chloride ions.
Hydrochloric acid is a solution containing hydrogen ions H+ and chloride ions Cl-.
©2021 Physics and chemistry