The hydroxide ions can combine with hydrogen ions (therefore, decreasing the number of hydrogen ions in the solution) to form more water. The principles of how acids and bases react in water form the basis of the pH scale.
In respect to this, what is OH and H+?
The pieces that result may contain an Hydrogen Ion (H+) or Hydroxyl Ion (OH-). This will change the pH. Hydrochloric acid (HCl) splits into Hydrogen Ions (H+) and Chloride Ions (Cl-). Extra H+ means acid solution (no more equal parts).
What is a H+ ion?
Hydrogen ion, strictly, the nucleus of a hydrogen atom separated from its accompanying electron. The hydrogen nucleus is made up of a particle carrying a unit positive electric charge, called a proton (q.v.). The isolated hydrogen ion, represented by the symbol H+, is therefore customarily used to represent a proton.
How do H+ and OH ions determine pH?
The outcome of a pH-measurement is determined by a consideration between the number of H+ ions and the number of hydroxide (OH-) ions. When the number of H+ ions equals the number of OH- ions, the water is neutral. It will than have a pH of about 7. The pH of water can vary between 0 and 14.