The pH of a solution is the negative logarithm of the molar concentration of hyd
ID: 899249 • Letter: T
Question
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+]=107M and pH=7. As [H3O+] increases, pHdecreases, 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=1.0×1014=[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.
Assuming each solution to be 0.10 M , rank the following aqueous solutions in order of decreasing pH.
Rank the solutions from the highest to lowest pH. To rank items as equivalent, overlap them.
HCl Ba(OH)2 NaOH N2H4 HOCl
Explanation / Answer
answer : Ba(OH)2 > NaOH > N2H4 > HOCl > HCl
explanation ;
HCl -----------------> strong acid
Ba(OH)2 -----------------> strong base
NaOH ---------------------> strong base
N2H4 --------------> weak base
HOCl --------------> weak acid
from the above data . strong acid has low pH stron base has high pH
Ba(OH)2 > NaOH > N2H4 > HOCl > HCl
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