Respuesta :
Concentration of solution having pH 6.45 is 3.55 * 10 -7 M. Concentration of solution having pH 5.28 is 1.90 * 10 -9 M and pH of the solution is 5.45.
pH of a solution is the measure of hydrogen ion concentration, which in turn is a measure of its acidity. Pure water dissociates slightly into equal concentrations of hydrogen and hydroxyl (OH−) ions.
Concentration of a solution is a measure of the amount of solute that has been dissolved in a given amount of solvent or solution. A concentrated solution is one that has a relatively large amount of dissolved solute. A dilute solution is one that has a relatively small amount of dissolved solute
a. The pH of a solution is 6.45
pH = 6.45
pH= -log [H+]
= [tex]10^-6.45[/tex]
[H+] = 3.55 * 10 -7 M
b. A solution has a pH of 5.28, find the [H+] and [OH-] concentration.
pH = 5.28
pH= -log [H+]
= [tex]10^-5.28[/tex]
[H+] = 5.25 * 10 -6 M
As [H+] [OH-} = 10-14
[OH-] = 10-14 / [H+]
= 10 -14 / 5.25 * 10 -6
= 1.90 * 10 -9 M
As pH is less than 7 the solution is acidic.
c. If a solution has a concentration of 3.5 . 10-6 M
here calculated pH = 5.45
As pH is less than 7, the solution is acidic.
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