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# Henderson-Hasselbalch question help! watch

1. Hi guys,

Could someone please(!!) help me work out this question?

"A weak acid has a pKa of 7.926. Calculate the pH of a solution in which the ratio of the concentrations of undissociated acid to acid anion ([HA]/[A]) equals 3.932"

I don't necessarily need the answer I just need to know how to figure it out! I'm sure the answer is something obvious but it's going over my head!

Thank you!
2. (Original post by SophieRxo)
Hi guys,

Could someone please(!!) help me work out this question?

"A weak acid has a pKa of 7.926. Calculate the pH of a solution in which the ratio of the concentrations of undissociated acid to acid anion ([HA]/[A]) equals 3.932"

I don't necessarily need the answer I just need to know how to figure it out! I'm sure the answer is something obvious but it's going over my head!

Thank you!
1. Do you know the equation for Ka of a weak acid dissociation?
2. Do you know how to convert pKa to Ka?

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