Ka values

[Nicole Weinstein 3E]

What do high/large values of Ka signify compared to low/small values of Ka?

[Charmaine Ho 2G]

The higher the Ka value, the stronger the acid

[Stephen_Kim_1D]

Ka is the equilibrium coefficient of an acid: [A-][H+]/[AH]. If Ka is large, the numerator is large, so the concentration of H+ is large; this is a relatively stronger acid. If Ka is small, the denominator is large, so there's a lot of undissociated AH acid and a small concentration of H+; this is a relatively weaker acid.

[Meghan Terrell 1B]

Another way to think about this is the pKa. Just like how when pH is low, we have a stronger acid, the same concept goes for pKa. The closer pKa is to 0, the stronger the acid. So, conceptually you can think about Ka being similar to [H3O+] and pKa being similar to pH.

[elletruchan2I]

Hi Nicole!
Higher Ka values correlate to a stronger acid, meaning that the reaction proceeds towards to products much more than towards the reactants, which would produce more H30+ in turn.

[Wilson Zheng 1L]

Ka is the acid disassociation constant (or viewed as the equilibrium constant)! The greater the Ka, the more likely the acid is going to disassociate, meaning that it is a stronger acid (as stronger acids more readily ionize/disassociate!)