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uglyturtle15
02.03.2020 •
Chemistry
The odor of spoiled butter is due in part to butanoic acid, which results from the chemical breakdown of butter fat. A 0.100 M solution of butanoic acid is 1.23% ionized. Calculate the value of Ka for butanoic acid.
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Ответ:
The value of Ka for butanoic acid is 1.53 X 10⁻⁵
Explanation:
Given-
Initial concentration of butanoic acid = 0.1M
Ionization percentage = 1.23%
Dissociation of butanoic acid:
HC₄H₇O₂ ⇒ C₄H₇O₂⁻ + H⁺
Initial 0.1 0 0
Change -x x x
Equilibrium 0.1 - x x x
The value of x can be calculated from the percent ionization.
percent ionization = |H⁺| X 100 / |HC₄H₇O₂|
1.23% = |H⁺| X 100% / 0.1M
|H⁺| = 0.1M X 1.23% / 100%
|H⁺| = 0.00123M
|H⁺| = |C₄H₇O₂⁻|
|C₄H₇O₂⁻| , x= 0.00123 M
Solving for the equilibrium concentration of HC₄H₇O₂
|HC₄H₇O₂| = 0.1 - x
|HC₄H₇O₂| = 0.1 - 0.00123 M
|HC₄H₇O₂| = 0.09877 M
Ka can be calculated as:
Ka = |C₄H₇O₂⁻| |H⁺| / |HC₄H₇O₂|
Ka = (0.00123) X (0.00123) / (0.09877)
Ka = 1.53 X 10⁻⁵
The value of Ka for butanoic acid is 1.53 X 10⁻⁵
Ответ:
0.4M NaOH
Explanation:
Molarity, M, is an unit of concentration widely used defined as the ratio between moles of solute (In this case, NaOH) and volume of solution in liters.
As the solution contains 2 moles of NaOH-Moles of solute- in 5L of solution, the molarity is:
2 moles NaOH / 5L =
0.4M NaOH