Sodium is not a macromolecule hence it does not contain any calories.
<h3>Does sodium contain calories?</h3>
The term calorie is a unit of energy. We often us the term to describe the amount of energy that is contained in each kind of food. The higher the calories, the greater the energy that the food contains.
Calories can only be contained by macromolecules such as proteins, carbohydrates, fats etc. Sodium is not a macromolecule hence it does not contain any calories at all hence the classmate is wrong.
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Answer:
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Explanation:
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Missing: 240 | Must include: 240
Answer:
pKa = 3.72
Explanation:
Let's consider the dissociation of a generic monoprotic weak acid.
HA(aq) ⇄ H⁺(aq) + A⁻(aq)
For a weak acid, we can find the value of the acid dissociation constant (Ka) using the following expression:
where,
[H⁺] is the molar concentration of H⁺
Ca is the initial concentration of the acid
First, we need to find [H⁺] from pH.
pH = -log [H⁺]
[H⁺] = antilog -pH = antilog -2.40 = 3.98 × 10⁻³ M
Then,
Finally,
pKa = -log Ka = -log 1.89 × 10⁻⁴ = 3.72