Answer:
pH = 12.65
Explanation:
From the given information:
number of moles =mass in gram / molar mass
number of moles of KOH = mass of KOH / molar mass of KOH
number of moles of KOH = 0.251 g / 56.1 g/mol = 0.004474 mol
For solution :
number of moles = Concentration × volume
concetration = number of moles/ volume
concetration = 0.004474 mol / 0.100 L
concetration = 0.04474 M
We know that 1 moles KOH result into 1 mole OH⁻ ions
Therefore, Molarity of OH⁻ = 0.04474 M
Now,
pOH = -log[OH⁻]
pOH = -log (0.04474) M
pOH = 1.35
Similarly,
pH + pOH = 14
pH = 14 - pOH
pH = 14 - 1.35
pH = 12.65
The pH of a KOH solution is 12.65.
"To understand the calculation, check below."
Given:
Number of moles =mass in gram / molar mass
Number of moles of KOH = mass of KOH / molar mass of KOH
Number of moles of KOH = 0.251 g / 56.1 g/mol
Number of moles of KOH = 0.004474 mol
Number of moles = Concentration × volume
Concentration = number of moles/ volume
Concentration = 0.004474 mol / 0.100 L
Concentration = 0.04474 Mol
Molarity of OH⁻ = 0.04474 M
pOH = -log[OH⁻]
pOH = -log (0.04474) M
pOH = 1.35
pH + pOH = 14
pH = 14 - pOH
pH = 14 - 1.35
pH = 12.65
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