pH calculator from molarity is a tool to find the value of pH for given molarity. Molarity refers to the “amount of a substance in a certain volume of the solution”. So, when you are given molarity, how can you calculate pH with the help of the pH calculator from molarity. It’s very simple, use our calculator given below.

pH calculator from molarity

How to use a pH calculator from the molarity calculator?

Molarity is defined as the moles of a solute per liters of a solution.

∴ Molarity = Moles of solute/Volume of solution

The units of molarity are M or mol/L

We know, the formula for calculating the pH when you are given molarity is –

⇒ pH = -log_{10}[H^{+}]

Here, H^{+} represents the value of molarity, so, when you have a value of H+ or molarity, you can calculate the pH value by taking the logarithm to the base 10 of the H^{+} or molarity.

Note: In pH calculator from molarity, the log value refers to a logarithm to the base 10. This is not the same as the “ln” button, which refers to refers to a logarithm to the base e.

That’s all, now, you can easily calculate the pH value if you know the concentration of the hydronium ion in moles per liter (molarity).

For example –

⇒ Calculate the pH value when the molarity of an aqueous solution is 6.3 × 10^{-5}.

So, we have, a molarity value = 6.3 × 10^{-5}, just reform this value in decimal form

∴ 6.3 × 10^{-5} = 0.000063

Let’s put this value in the pH calculator from molarity and press calculate button as shown in the figure given below.

∴ pH = −log[0.000063] = 4.2 Answer

FAQ

What is the formula used in the pH calculator from molarity?

The formula used for calculating the pH when given molarity or H+ concentration is –

⇒ pH = -log_{10}[H^{+}]

This formula is also defined as –

pH is the negative log refers to the logarithm to the base 10 of the molar hydrogen ion concentration.

Calculate the pH of 0.03 M solutions of HBr?

We know, that HBr is a strong acid and 100 % ionized in water, therefore, the concentration of hydrogen ions is exactly the same as the concentration of the acid solution.

∴ [H^{+}] = 0.03 M

Put this value in pH calculator from molarity and press the calculate button.

So, the pH value is 1.52 for a given 0.03 M solution of hydrobromic (HBr) acid.

Calculate the pH of the solution that has a hydrogen ion concentration of 1.26 × 10^{−5} M.

Change the value of hydrogen ion concentration in simple decimal form.

∴ 1.26 × 10^{−5} = 0.0000126

Put this value in pH calculator from molarity and press the calculate button.

So, the pH value is 4.90 for a given hydrogen ion concentration of 1.26 × 10^{−5} M.

Suppose a sample of nitric acid HNO_{3} with a molarity of 0.0032 M, How do you calculate its pH value?

We know, that HNO_{3} is a strong acid which means it will completely dissociate into H^{+} and NO_{3}^{–}.

So, its hydrogen ion concentration (H^{+}) will be 0.0032 M.

Let’s put this value in the pH calculator from molarity and press the calculate button.

Vishal Goyal is the founder of Topblogtenz, a comprehensive resource for students seeking guidance and support in their chemistry studies. He holds a degree in B.Tech (Chemical Engineering) and has four years of experience as a chemistry tutor. The team at Topblogtenz includes experts like experienced researchers, professors, and educators, with the goal of making complex subjects like chemistry accessible and understandable for all. A passion for sharing knowledge and a love for chemistry and science drives the team behind the website. Let's connect through LinkedIn: https://www.linkedin.com/in/vishal-goyal-2926a122b/

Topblogtenz is a website dedicated to providing informative and engaging content related to the field of chemistry and science. We aim to make complex subjects, like chemistry, approachable and enjoyable for everyone.