what is the effective H3O+ concentration in a 10mM phosphate buffer at pH 4.0?
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the concentration is rather minimum maximum
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The effective concentration of hydroxonium ion also called hydronium ion, H₃O⁺ is 10⁻⁴ M.
The calculation of the concentration of a given solution be it base or a acid follow the similar principle.
It is known that pH is given as -log [concentration]
And in the given case, the pH of the hydronium ion is given as 4.0.
Thus, the concentration of hydronium ion is 10^-pH, that is, 10⁻⁴ that gives 1.0 × 10⁻⁴, which is similar as 10⁻⁴.
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