What is oh-?

OH- or hydroxide is a polyatomic ion with a negative charge. It consists of one atom of oxygen and one atom of hydrogen, linked by a covalent bond. OH- is often considered to be a strong base because it has a tendency to accept hydrogen ions (H+) in a process known as protonation, thus raising the pH of the solution. It is found in many different chemical compounds, including common bases such as sodium hydroxide (NaOH) and potassium hydroxide (KOH). OH- is also an important component in chemical reactions such as acid-base neutralization, where it reacts with hydrogen ions from an acid to form water.