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schepotkina [342]
3 years ago
5

A solution containing a mixture of lactic acid and lactate was found to have a pH of 4.34. Calculate the ratio of the lactate co

ncentration to the lactic acid concentration in this solution.
Chemistry
1 answer:
Galina-37 [17]3 years ago
7 0

Answer:

3.02

Explanation:

Step 1: Given and required acid

pH of the solution: 4.34

pKa of lactic acid: 3.86

Step 2: Calculate the ratio of the lactate concentration to the lactic acid concentration in this solution

We have a buffer system formed by a weak acid (lactic acid) and its conjugate base (lactate ion). We can find the ratio of the lactate concentration to the lactic acid concentration in this solution using the Henderson-Hasselbach equation.

pH = pKa + log [lactate]/[lactic acid]

4.34 = 3.86 + log [lactate]/[lactic acid]

[lactate]/[lactic acid] = 3.02

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The ph scale for acidity is defined by ph=−log10[h+] where [h+]is the concentration of hydrogen ions measured in moles per liter
Leokris [45]

The question is incomplete.

The complete question probably is

The pH scale for acidity is defined by pH = − log₁₀[H⁺] where [H⁺] is the concentration of hydrogen ions measured in moles per liter (M). A solution has a pH of 2.55. Find the hydrogen ion concentration.

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Thus the hydrogen ion concentration [H⁺] = 10^{-pH}

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7 0
4 years ago
Which option is a key point of cell theory? Cells can repair neighboring cells, but not themselves.Cells can repair neighboring
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3 0
3 years ago
What is the kinetic energy of a 5 kg object moving at 7 m/s?
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Answer:

122.5 Joule, or 122.5 j

Explanation:

Given,

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Applying the formula:

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Kinetic energy is the energy that an object gains as the result of the motion.  It also depends on the mass of the object and force with which the motion is applied.  In the given question, the mass of the object is 5 kg and the force of the velocity by which it is moving is 7 m/s.

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