# How is pH calculated?

**calculate**the

**pH**of an aqueous solution you need to know the concentration of the hydronium ion in moles per liter (molarity). The

**pH**is then

**calculated**using the expression:

**pH**= - log [H

_{3}O

^{+}]. On a calculator,

**calculate**10

^{-}

^{8.34}, or "inverse" log ( - 8.34).

Simply so, how is the pH scale calculated?

The **pH** of a solution also can be **determined** by finding the pOH. Determine the concentration of the hydroxide ions by dividing the molecules of hydroxide by the volume of the solution. Take the negative log of the concentration to get the pOH. Then subtract this number from 14 to get the **pH**.

Subsequently, question is, what is pOH formula? The calculation for **pOH** follows the same rules as for pH, but uses the **concentration** of OH^{-} ions: **pOH** = - log(OH^{-}). For example, find the **pOH** of a 0.02 M solution of sodium hydroxide (KOH). The **concentration** of OH^{-} ions is 0.02 moles per liter. **pOH** = - log(.

Similarly one may ask, what is pH and how is it measured?

The **pH** of a solution is a **measure** of the molar concentration of hydrogen ions in the solution and as such is a **measure** of the acidity or basicity of the solution. The letters **pH** stand for "power of hydrogen" and numerical value for **pH** is just the negative of the power of 10 of the molar concentration of H^{+} ions.

What is the importance of pH?

**pH** is **important** because substances such as our stomach acids tend to be at a certain **pH** in order to work properly. **pH** is also **important** because it must be at certain levels in order for living organisms to survive. Create a large **pH** scale (two or three meters long).