Answer: a. the elements that make up the compound
Step-by-step explanation:
Chemical formulas are the symbolic representation of the elements contained in a compound along with their relative proportions.
For example: The chemical formula for water is
which shows that it is formed by combination of hydrogen and oxygen in the ratio of 2: 1 respectively.
pH of the solution is determined by litmus paper, pH paper or pH meter.
Boiling point is the temperature at which atmospheric pressure becomes equal to the atmospheric pressure.