Discussion
The concentration of hydrogen ions in a sample of soft drink is 2×10-4mol lit-1 . Its pH value is (log 2 = 0.3010)
Answer: B
The pH is 3.699.
\[ \begin{aligned} pH &= -\log(2 \times 10^{-4}) \\ &= 4 - \log 2 = 4 - 0.301 = 3.699 \end{aligned} \]
A soft drink is acidic, so a pH below 7 makes sense. 4.301 (not offered) would come from adding \(\log 2\); 3.301 and 5.301 put the 0.301 on the wrong side or use the wrong power of ten.
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