The pH of a 0.86M solution of hydrocyanic acid (HCN) is measured to be 4.64. Calculate the acid dissociation constant K of hydrocyanic acid. Round your answer to 2 significant digits.
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![The pH of a 0.86 M solution of hydrocyanic acid (HCN) is measured to be 4.64.
Calculate the acid dissociation constant \( K_a \) of hydrocyanic acid. Round your answer to 2 significant digits.
\[ K_a = \]
There is a text box provided for the user to input their answer. Next to the box, there is an interface with buttons including options for entering exponential notation (indicated by "x10") and a reset button (indicated by an "X") as well as a refresh icon. The user is expected to round their calculations and enter the value of \( K_a \) in the text box.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa60cc6ce-11de-444a-af29-e9eb1b50e640%2Fc420dfc1-e46e-4e3d-8d5a-70465d8688f1%2F7opc49e_processed.png&w=3840&q=75)
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