What is the concentration of hydronium ions in a solution at 25 c with ph 4.282?

PH scale is used to determine how acidic or basic a solution is. 
pH can be calculated as follows 
pH = - log [H₃O⁺]
since pH is known we can calculate [H₃O⁺]
[H₃O⁺] = antilog(-pH)
pH = 4.282
[H₃O⁺] = - antilog (-4.282)
[H₃O⁺] = 5.22 x 10⁻⁵ M
concentration of hydronium ions is 5.22 x 10⁻⁵ M

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