Henderson Hasselbach Calculation Help!!!

[Majumatata]

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Apply the Henderson Hasselbach equation to calculate the percentage of Articaine that is in the neutral form at pH 7.2

pKa of Articaine is 7.6

the answer is 29% but I keep getting 39%. Please explain how you derived the answer because I take 10^-.4 =.39 x 100 = 39% once I subtract the pKa from pH

Also, what differentiates it from my answer for part a?

This

 

[AlteredScale]

Can't help you with the question but can I ask what class this is for?

 

[Majumatata]

biochem

 

[gettheleadout]

SDN is not for homework help. Closing.