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Answer to this week's riddle

Again, the riddle:  

Put the following in order or pH: seawater, lemon juice, blood, milk, black coffee, distilled water, acid rain.

Answer: Lemon juice 2.3; black coffee 5.0; acid rain 5.2; milk 6.8; distilled water 7.0; blood 7.4; seawater 8.0.


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