Physics, 13.10.2020 01:01, nails4life324

The pH of a sample of lake water was originally 6 when measured in 1987. When measured again in 2014, the pH of the water was 4. How has the concentration of hydrogen ions in the lake changed?

1. The concentration of hydrogen ions has increased by a factor of 2.
2. The concentration of hydrogen ions has increased to 10 times its original value.
3. The concentration of hydrogen ions has increased to 100 times its original value.
4. The concentration of hydrogen ions has decreased by a factor of 2.

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The pH of a sample of lake water was originally 6 when measured in 1987. When measured again in 2014...