Chemicals that release the H+ ion when dissolved in water are acids. Chemicals that release the OH- ion when dissolved in water are alkali (also known as bases) and water is neutral.
Electrolytes that release hydrogen ion in water are called acids.
Acids
Virtually all acids release hydrogen ions (or protons) in water. They also release other ions, but these are specific to each acid. For example, hydrochloric acids releases an hydrogen ion (H+) plus a chloride ion (Cl-).
When acids in water hydrogen positive ion is produced in excess. It is this hydrogen positive ion that gives acidity of a solution.
An acid is any chemical compound which when dissolved in water tends to release the H+ ion, and a base is any chemical compound which when dissolved in water tends to release the OH- ion.
molecules in water that release hydrogen ions (H+) are acids, while molecules in water that release hydroxide (OH-) are bases. In water solutions, acids affect water molecules, producing hydronium (H3O+) and bases also affect water molecules, producing hydroxide (OH-) ions.
Acids most of the time have an H in the beginning of the formula (except for acetic acid.) They also release a H+ ion in water The formula of a Base has an OH in it (except for NH3 Ammonia) They release OH- ions in water.
The conjugate acid of water is the hydronium ion (H3O+) and the conjugate acid of water is the hydroxide ion (OH-).
This ion is H+.
Indicators and neutralization ions
When acids dissolve in water they release a proton - also called a H+ ion. So the answer is "a". The level of acidity is due to H+ and level of alkalinity due to (OH)-. This is displayed in the equation pH=-log[H+] i.e. concentration of H+ ion.