We have that for the Question "since ph can affect the activity of the antibiotics why would the Kirby bauer test require that the agar have a ph of 7.4" it can be said that
From the question we are told
since ph can affect the activity of the antibiotics why would the Kirby bauer test require that the agar have a ph of 7.4
Generally
Agar has a ph value that should exist between 7.2 and 7.4 within a room temperature,given it solidifies and this should be when initially prepared
Therefore
Why the Kirby bauer test require that the agar have a ph of 7.4 is because
while agents may be in excessive activity, given a scenario that the pH is to exceed 7.4 the results might inverse.
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