The pH of the solution is 6.07.
pKa = 6.86; the acid equilibrium constant
c(H₂PO₄⁻) = 0.422 mM; concentration of the acid
c(HPO₄²⁻) = 0.068 mM; concentration of the salt
Henderson–Hasselbalch equation for the buffer solution:
pH = pKa + log(c(HPO₄²⁻)/c(H₂PO₄⁻))
pH = 6.86+ log (0.068 mM/0.422 mM).
pH = 6.86 + log0.161.
pH = 6.86 - 0.79
pH = 6.07; potential of hydrogen
pH (potential of hydrogen) is a numeric scale used to specify the acidity or basicity an aqueous solution.
When pH is less than seven (pH<7), solution is acidic..
When is equal seven (pH = 7), solution is neutral.
When pH is greater than seven (pH > 7), solution is basic.
More about buffer: brainly.com/question/4177791
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