Which is more acidic?
pH 3 is more acidic than pH 4 because as you get closer to 0 you get more and more acidic, and as you get closer to 14 you get closer to being base. & is neutral pH and distilled water has a pH of 7.
By how many times?
10 times. One level of pH difference has ten times the concentration of positive hydrogen atoms because it is a log function.
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