If you are working in a chemical or other scientific laboratory, you may need to use a pH meter to find the solution is acidic or basic. When pH or pOH of solution is known, we can readily calculate concentrations of hydronium ion (H3O+) or hydroxyl ion (OH-) using the pH equation. Also, in this online pH calculator, you have to just substitute pH or pOH value and it will give you what is the H3O+ ion concentration of aqueous solution. Also, several examples are explained with each step of calculation at the end of this tutorial.
Sometimes, H3O+ is denoted as H+ and we also use H+ term instead of H3O+ term.
There are two calculators in this online calculator.
This calculator will give H+ concentration in mol dm-3. Ionic product (Kw value) of water is taken as 1 * 10-14 mol2 dm-6. Therefore, results of this online calculator are very much accurate around 250C.
This calculator will give H+ concentration in mol dm-3. Here also, results of this online calculator are very much accurate around 250C.
Because pH = 1, this solution is a strong acidic solution. We can substitute pH = 1 in pH equation.
Because pH = 13, this solution is a strong basic solution. We can substitute pH = 1 in pH equation.
Because pH + pOH = 14 at 250C.
From pOH equation, OH- concentration can be calculated.
Because pH value is given, we can find the H+ concentration directly from pH equation.
Whether acetic acid concentration is given, we cannot get a direct and easy relationship between acetic acid concentration and H+ ion concentration because acetic acid is a weak acid.
In the answer too, you can see H+ ion concentration is much lower than acetic acid concentration.
If there are two or more acids in a aqueous solution, all of them give H+ ions in different amounts (or in concentrations). So, there is only one H+ ion concentration throughout the aqueous solution. So, pH value is uniform throughout the solution. When, we measure the pH value of acidic solution and calculate H+ ion concentration, it indicates the overall H+ concentration of solution. But, you cannot decide individual concentrations of HCl and H2SO4 acids.
See pH equation. There are only 2 terms in pH equation, H ion concentration and pH value. There is no term for temperature. So, there is no effect for H+ ion concentration when it is calculated from pH value in different temperatures.