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Finding Hydrogen Ion Concentration

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How do you find hydrogen ion concentration, and which of the following have the highest concentration?
55.6M H2O
0.25 M HCl
1.0 M CH4
1.2 M NaOh
0.20 M NaH

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In water, the pH is always 7 (see reference). So the hydrogen ion concentration is 10^-7 (M)
HCl is a strong acid. It dissociates ...

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