To calculate the pH when the hydroxide ion concentration is 6.71x10^-5 M, we first need to find the pOH by taking the negative logarithm of the hydroxide ion concentration:
pOH = -log(6.71x10^-5)
pOH = 4.17
Since pH + pOH = 14, we can now calculate the pH:
pH = 14 - pOH
pH = 14 - 4.17
pH = 9.83
Therefore, when the hydroxide ion concentration is 6.71x10^-5 M, the pH of the solution is 9.83.
ph when [OH-] is 6.71x10-5M
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