Answer:
Dissociated state is the predominant one
Explanation:
When a molecule with pKa of 4.52 is in an aqueous solution at pH = 4.0, follows the H-H equation, thus:
pH = pKa + log₁₀ [A⁻] / [HA]
<em>Where [A⁻] is the dissociated state and [HA] represents the protonated state</em>
Replacing:
4.0 = 5.2 + log₁₀ [A⁻] / [HA]
-1.2 = log₁₀ [A⁻] / [HA]
0.063 = [A⁻] / [HA]
[HA] = 16 [A⁻]
That means you have 16 times more [HA] than [A⁻] and the <em>dissociated state is the predominant one</em>
Answer:
The mass number
Explanation:
neutrons + protons = mass number
Ca(OH)2 because Calcium tends to favor a positive 2 charge and OH tensd to favor a negative 1 charge.
The number of protons = atomic number in Periodic table, so 35
The number of neutrons = mass number - number of protons = 79-35=44
The number of electrons = atomic number - 1 = 35-1 =34
