We can easily use molarity or [H+] in moles/L to find the pH of the solution.
If the concentration of H+ ions is known in moles/L, we can determine the pH of the aqueous solution by taking the negative logarithm of that numerical value, as shown below.
∴ pH = -log10 [H+]
pH calculator from Molarity
pH from Molarity Calculator
pH =
Step by Step Solution:
To determine pH from molarity, you can use this formula given below:
⇒ pH = -log([H⁺])
Given that,
⇒ H⁺ = M
Substitute the [H⁺] value into the formula:
∴ pH = -log()
∴ pH =
How to use a pH from a molarity calculator?
Using the above calculator you can easily calculate the pH value from H+ concentration in mol/L (molarity).
Enter a [H+] value in the input field labeled “[H+] value=”.
Click the “Calculate” button.
The result of pH will be displayed in the “result” section with a step-by-step solution.
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 = -log10[H+]
As per the above formula, if the concentration of hydrogen ions present in an aqueous solution is known in mol/L (i.e., molarity), then its pH can be calculated by taking the negative logarithm to the base 10 of the molarity value.
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. Enter this value in the H+ label field in the calculator as 6.3e-5.
∴ 6.3 × 10-5 = 6.3e-5
Let’s put this value in the “pH calculator from molarity” and press calculate button as shown in the figure given below to get step by step solution.
∴ 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 = -log10[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 the 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.
We have given the hydrogen ion concentration value.
∴ 1.26 × 10−5 = 1.26e-5
Put this value in the 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 HNO3 with a molarity of 0.0032 M, How do you calculate its pH value?
We know, that HNO3 is a strong acid which means it will completely dissociate into H+ and NO3–.
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.
