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# How can pH be calculated from molarity?

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To calculate pH from molarity, take the negative logarithm of the molarity of the aqueous solution similar to the following equation: pH = -log(molarity). pH is the measure of how acidic or basic a substance is, which refers to the concentration of hydrogen atoms that are present. Molarity is the concentration of a particular aqueous solution in moles, also known as Avogadro's number, per liter.

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An individual who already has the molarity of an aqueous solution can simply use a calculator with the molarity to determine what the pH of the solution. pH ranges from 0 to 14. A neutral pH, which is the pH of water, is 7.0 while a pH less than 7.0 is considered to be acidic. A pH above 7.0 is considered to be basic. Any solution that has a very acidic or basic pH is considered to be reactive, and will easily react with other molecules and elements found in various solution to produce different compounds.

The pH and pOH of an aqueous solution should equal to 14. This is to maintain the equilibrium of the ionization reactions that happen in the solution. In short, if the pH or the pOH of a solution is known, the other can be easily deduced through simple math.

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## Related Questions

• A:

Hydriodic acid is an aqueous solution of hydrogen iodide whose chemical formula is HI. It is formed when hydrogen iodide (colorless gas with a sharp odor) is dissolved in water to form a pale yellow solution, which is strong and highly corrosive.

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Potassium nitrate or KNO3 is neither acidic nor basic; it is neutral and has a pH of 7. An aqueous solution of potassium nitrate contains ions of K+ and NO3-.

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When the pH of a solution is equal to the pKa, the buffer is in its most effective state. In this state, the concentration of the conjugate base is equal to that of the acid, allowing it to effectively neutralize added strong acid or base and maintain a desired pH. For a desired pH different than the pKa, the ratio of the base to the acid is modified.