Question

What type of compound forms hydrogen ions in solution?

Answer 1

As we know that the various compounds have the tendency to dissociate when added in solutions like water. This dissociation liberates various types of ions in the solution. When hydrogen ions are produced in a solution, then the pH of that solution gets lowered and ranges. The concept which we study when we know what is acid or a base and there is the Arrhenius concept.

Complete answer: The dissociation of any compound produces various ions in solutions. Ions are produced in any solution only, when the added electrolyte is of the same type as that of the solution, because like dissolves like. Some compounds have the tendency to liberate hydrogen ions in the solution. Thus acids have the tendency to liberate hydrogen ions in solutions. When dissolved in water, they have the tendency to give ions, which are also acidic and are called hydronium ions. These solutions, when subjected to determining the pH, have a pH range of $1$ to $6,$ this means that these compounds are acidic compounds. According to Arrhenius the substances that generate hydrogen ions when dissolved in aqueous solution are called Arrhenius acids. So our answer will be the Arrhenius acids are the compound that forms hydrogen ions in solution.
An Arrhenius acid is defined as a substance that introduces ${{H}^{+}}$ ions in solution. There are other definitions of an acid that are broader than this, but one that specifically introduces ${{H}^{+~}}$ in solution is called an Arrhenius acid.

Note:
The fact that acids produce hydrogen ions in solutions makes them weak and strong acids. The acids that completely dissociate into hydrogen ions are termed as strong acids, like Hydrochloric acid and Sulphuric acid, while the acids that partially dissociate into hydrogen ions are termed as weak acids like acetic acid.