Chemistry, 17.12.2019 02:31 Jasmineemarieee
The ph of a solution is the negative logarithm of the molar concentration of hydronium ion, that is, ph=−log[h3o+] in neutral solutions at 25 ∘c, [h3o+]=10−7 m and ph=7. as [h3o+] increases, ph decreases, so acidic solutions have a ph of less than 7. basic solutions have a ph greater than 7. the hydroxide and hydronium ion concentrations are related by the the ion-product constant of water, kw , as follows: kw=1.0×10−14=[h3o+][oh−] in the same way as the ph, we can define the poh as poh=−log[oh−]. it follows from the kw expression that ph+poh=14.
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