finding pH

[Hannah Kaye 1L]

how do you calculate pH if you aren't given any values and only have the formula?

[Jamie Lin 1K]

I think there would have to be some value given to calculate pH. Whether its the concentration of H+ or that of OH- or the pOH, we would then be able to use other pH related equations to ultimately solve for pH. However, in a lab, I believe you may use litmus paper to test the pH of solutions, but I think this would be more for the lab component of the chem series.

[205678283]

They will give you [OH] concentration, [H+] concentration, pH, or pOH. Then you can use this chart to plug it in. But you might also be asked a more general question about which molecule has a higher/lower pH purely based on the formula, which we can use periodic table trends to figure out which is more acidic/basic, and we know that more acidic molecules have lower pHs.

[AngelinaYuleiGao 1B]

You need more than the formula to calculate pH; usually, the concentration of the acid or base is enough for us to calculate the pH of the solution. Remember that pH is not a characteristic of any particular acid the way, say, ionization energies are for an atom. They're simply the -log₁₀ of the concentration of hydronium ions in a solution. Thus, a very dilute solution of a very strong acid will have a higher pH than a more concentrated solution of said same strong acid. Thus, knowing the concentration gives you enough information to calculate the pH.

[Alan Nguyen 2I]

To find pH, pOH, or the other values that you had mentioned, you would only need one value, and you could get to all the other ones. You would only need one of the following: [H+],[OH-], pH, pOH. You can go back and forth between these values easily using the relationships between the values.

[Daniel Tabibian 3K]

You would need the [H+] , [OH], or pOH to calculate the pH value.

[Parinita Jithendra 2A]

I think that as long as you have the H+ ions OH ion or pOH you should be able to calculate pH. I believe they will give you at least one in a problem.