First slide

PH scale, PH of strong acids and strong bases

Question

The hydroxide ion concentration of a wine is 8 x 10 ^-11 M . What is the pH of the wine?

Moderate

A

2.10
B

2.9
C

3.9
D

4.9

Solution

$p^{OH} = - \log_{10} [{OH}^{-}] = - \log [8 \times 10^{- 11}] = 11 - \log 8 = 11 - 0.903 = 10.097 P^{H} = 14 - P^{OH} = 14 - 10.097 = 3.9$

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