Answer:
percent ionization = 50.01%; pH = 4.75
Explanation:
To solve this question we must write the acetic acid equilibrium (Where HX will be acetic acid and X⁻ the sodium acetate):
HX(aq) ⇄ H⁺(aq) + X⁻(aq)
Where equilibrium constant, Ka, is defined as:
Ka = 1.76x10⁻⁵ = [H⁺] [X⁻] / [HX]
<em>Where the concentration of each ion is:</em>
[H⁺] = X
[X⁻] = 0.10M + X
[HX] = 0.10M - X
Replacing in Ka expression:
1.76x10⁻⁵ = [X] [0.10-X] / [0.10+X]
1.76x10⁻⁶ + 1.76x10⁻⁵X = 0.10X - X²
X² - 0.0999824 X + 1.76×10⁻⁶ = 0
X ≈ 0.1M → False solution. Decreases a lot the concentration of HX
X = 0.0000176M → Right solution.
The concentration of each ion is:
[H⁺] = 0.0000176062M
[X⁻] = 0.10M + 0.0000176M = 0.1000176M
[HX] = 0.10M - 0.0000176M = 0.0999824M
Percent ionization:
[X-] / [X-] + [HX] * 100 =
0.1000176M / 0.2M =
<h3>50.01%</h3><h3 />
And pH = -log [H+]
<h3>pH = 4.75</h3><h3 />
As you can see, [H+]≈ Ka
Molarityof the solution will be 907.35 m.
<h3>What is Molality?</h3>
Molaity is the no. Of moles of an compound is present in 1 kg solution .
Molality= no.0f moles / mass of the solution (in kg)
The SI unit of molality is m .
We have given here ,
Volume of benzene= 44.0ml
Density of benzene =0.877g/ mol
Volume of hexane =167 ml
Density of hexane =0.660g/ mol
Mass of benzene = 44×0.877
. →38.588 g
Mass of hexane→167×660
. → 110.220g
mass of the solution→148.808g
molar mass of the solution→78+ 86
. →164g/ mol
Molality = 148.808/ 164×1000
→907.35m
So , molality will be 907.35 m
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Answer:
Molecular formula => C₃H₈O₃
Explanation:
From the question given above, the following data were obtained:
Carbon (C) = 39.12%
Hydrogen (H) = 8.75%
Oxygen (O) = 51.12%
Molar mass of compound = 92.09 g/mol
Molecular formula =?
Next, we shall determine the empirical formula of the compound. This can be obtained as follow:
C = 39.12%
H = 8.75%
O = 51.12%
Divide by their molar mass
C = 39.12 / 12 = 3.26
H = 8.75 / 1 = 8.75
O = 51.12 / 16 = 3.195
Divide by the smallest
C = 3.26 / 3.195 = 1
H = 8.75 / 3.195 = 2.7
O = 3.195 / 3.195 = 1
Thus, the empirical formula is CH₂.₇O
Finally, we shall determine the molecular formula of the compound. This can be obtained as follow:
Empirical formula = CH₂.₇O
Molar mass of compound = 92.09 g/mol
Molecular formula =?
Molecular formula = Empirical formula × n
Molecular formula = [CH₂.₇O]ₙ
92.09 = [12 + (2.7×1) + 16] × n
92.09 = 30.7n
Divide both side by 30.7
n = 92.09 / 30.7
n = 3
Molecular formula = [CH₂.₇O]ₙ
Molecular formula = [CH₂.₇O]₃
Molecular formula = C₃H₈O₃
Answer:
Steps of the technological design process include: identify a problem, research the problem, generate possible solutions, select the best solution, create a model, test the model, refine and retest the model as needed, and communicate the final solution.
Explanation:
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Answer: false
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