A ph tester.
it is a gas which in water shows the acidic property.
Base
The hypothesis of an acid-base titration is that the volume of the acid solution needed to neutralize a base solution is stoichiometrically equivalent to the volume of the base solution required to neutralize the acid. This forms the basis for determining the unknown concentration of an acid or base by titration.
When water is added to a strong acid or base, the concentration of the acid or base decreases because water dilutes the solution. This results in a less concentrated solution of the acid or base.
A buffer solution contains a weak acid and its conjugate base, which helps resist changes in pH when small amounts of acid or base are added. Therefore, a buffer solution contains both acid and base components.
An acid or base is never a single element, it is a solution, and a solution that contains H+ OR OH- in it, so oxygen is neither an acid nor base.
An acid solution has a pH under 7.A base solution has a pH over 7.
The concentration of an acid or base is usually given as a quantity with a unit mol dm^-3 where the mol stands for mole and dm=1/10 metre. 1 mole contains 6.022x10^23 atoms or molecules. The value representing the concentration of an acid or base shows the number of acid/base molecules found in 1dm^3 of the solution. The rest of the solution will typically be H20 molecules (water). This basically means "how strong it is".
Oviously a base...
In solution this is an acid. Hydrochloric acid.
or.
It depends on the volumes, concentrations and nature of the acid and base.