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PH值是2的溶液中氢离子是PH值是4的溶液中氢离子的几倍

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PH值是2的溶液中氢离子是PH值是4的溶液中氢离子的几倍
原题是这样的:How many times more concentrated are the hydrogen ions in a solution of PH2 compared to a solution of PH4?
(a)twice (b)ten times (c)twenty times (d)one hundred times
PH值是2的溶液中氢离子是PH值是4的溶液中氢离子的几倍
D.100倍.
溶液中氢离子浓度等于十的负PH值次方