Going from pKa to pH

[ursulavictorino1K]

I'm still quite confused on how to go from pKa to pH like it was asked on one of the midterm questions. Could someone break it down?

[Vinita Saxena 2I]

Use pKa to get the concentration of H3O+ (using an ice table) and then use the concentration of H3O+ to get the pH

[Alondra]

The image I attached explains the relationship between pka,pkb,pH and pOH.

[ursulavictorino1K]

I was confused because in my notes u had pka=10^7 and pH=7 so I don't know if I miswrote it.

[J Medina 2I]

Maybe you meant that when pKa = 10^-7 that the pH = 7, which would be true.

[WGaines_2E]

The lower the pH, the higher the concentration of hydrogen ions [H+].
The lower the pKa, the stronger the acid and the greater its ability to donate protons.

[Sally Qiu 2E]

i don't believe there's any direct conversion to get from pKa to pH. instead you'll have to convert pKa to Ka and make an ICE table to find the concentration of H+. then you can solve the equation and convert H+ to pH.

[Subashni Rajiv 1K]

Also, don't forget that pKa and pKb are related to one another. So if you are given the pKb and asked for pH you can convert to pKa and go from there.

[Jacob Motawakel]

You can use pKa to find the concentration of [H+] through an ICE box, then using the [H+] concentration, you can find pH by plugging [H+] into the equation pH=-log[H+]

[Julia Holsinger_1A]

What does the w in pKw stand for?

[William Chan 1D]

^above, the w stands for water. kw is the equilibrium constant for water at 25°C.

For the actual question, from pka, we can determine ka. Using ka, we can use an ice table, using the initial concentrations of the reactants and products to determine the [H+] concentration, and using [H+], we can determine pH.