pH of the solution is 13.90.
The concentration of hydrogen (H+) ions in a solution, which is a measurement of acidity, is known as the pH of that solution. In pure water, hydrogen and hydroxyl (OH) ions are found in almost equal amounts.
A solution is acidic when there are too many hydrogen ions present, while a solution is basic when there are too few H+ ions or too many hydroxyl ions. The product of the concentrations of H+ and OH is the equilibrium constant for this reaction, Kw, which equals 10^14.
Mass of lithium = 4.8 g
Volume of the solution = 250 mL
[H3O+] = Kw/ [OH-]
Where,
[H3O+] : hydronium ion concentration
[OH-] : hydroxyl ion concentration
Kw : Equilibrium constant
moles of LiOH = 4.8/23.95 = 0.20 moles
strength of LiOH = 4 x 0.20 = 0.80 M
[H3O+] = Kw/ [OH-] = 10^(-14) / 0.80 = 1.25 x 10 ^(-14)
pH = - log [H3O+]
pH = - log ( 1.25 x 10 ^ (-14)) = 13.90
Therefor, pH is 13.90
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