For 1. 00 l of an aqueous buffer containing 60. 0 mmol of acetic acid (pa=4. 76) and 40. 0 mmol of acetate, the pH of this buffer is 4.58.
<h3>What is handerson Hasselbalch equation? </h3>
It is expressed as:
pH = pKa + log [A-]/[HA]
where,
[A-] is the molar concentration of conjugate base
[HA] is the molar concentration of weak acid
Given,
pKa = 4.76
<h3>Calculation of concentration:</h3>
C = n/V
= 60/1000
= 0.06M
C = 40/1000
= 0.04M
Now, substituting values in equation we get,
pH = 4.76 + log(0.04/0.06)
pH = 4.76 + (-0.176)
pH = 4.58
Thus by using Henderson Hasselbalch equation we find the value of pH of the buffer is 4.58.
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Answer: Option A. A candy bar
Option B. stretched rubber band
Option D. A roller coaster at the top of a hill
Explanation:
Answer:B random mutations
Explanation: Because I took the test
Answer:
This question is incomplete
The completed question is below
Which pair of molecules is expected to have the most different properties?
CO and NO
SO₂ and CH₄
The correct answer is SO₂ and CH₄
Explanation:
All the four substances are gases at room temperature.
Carbon monoxide (CO) and nitric oxide (NO) are both reactive oxides. They are both polar and inorganic also, hence should have some similar properties (based on there origin/composition and polarity).
Sulphur dioxide (SO₂) is polar because it's a bent molecule, methane (CH₄) is non-polar because of the tetrahedral shape of it's molecule. Methane is an organic molecule while sulphur dioxide is an inorganic molecule.
From the above, <u>it can be deduced that SO₂ and CH₄ are expected to have different properties</u>. For example, the polarity of SO₂ makes it dissolve in water to form an acidic solution while methane does not dissolve in water and hence doesn't form an acidic solution.
The cutoff frequency for a certain element is 1.22 x 1015 Hz this is its
work function in eV that is Work done = 5.05 eV.
<h3>What is supposed through a piece function?</h3>
Definition of labor function is the power this is wished for a particle to return back from the indoors of a medium and spoil via the surface —used particularly of the photoelectric and thermionic emission of electrons from metals paintings function.
- Work function = hf
- h= planks constant.
- f= frequency.
- W = 6.626 10^-34 1.22* 10^15.
- W = 8.08 10^-19 / ( 1.6 10^-19)
- W = 5.05 eV.
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