Solution:
Step 1: Calculate the pOH of a blood sample.
[tex]\text{pOH} = -log[\text{OH}^{-}][/tex]
[tex]\text{pOH} = -log(2.5 × 10^{-7})[/tex]
[tex]\text{pOH} = 6.60[/tex]
Step 2: Calculate the pH of a blood sample.
[tex]\text{pH} = 14 - \text{pOH}[/tex]
[tex]\text{pH} = 14 - 6.60[/tex]
[tex]\boxed{\text{pH} = 7.40}[/tex]
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