Answer:
pH = 9,32
Explanation:
The compound with 2 ionizable groups has the following equilibriums:
H₂M ⇄ HM⁻ + H⁺ pka = 6,2
HM⁻ ⇄ M²⁻ + H⁺ pka = 9,5
The reaction of M²⁻ with HCl is:
M²⁻ + HCl → HM⁻ + Cl⁻
The moles of M²⁻ are:
0,100L×1,0M = 0,1moles
And moles of HCl are:
0,060L×1,0M = 0,06moles
That means that moles of M²⁻ will be 0,1-0,06 = 0,04mol and moles of HM⁻ will be the same than HCl, 0,06mol
Using Henderson-Hasselbalch formula:
pH = pka + log₁₀ [M²⁻] / [HM⁻]
Replacing:
pH = 9,5 + log₁₀ [0,04] / [0,06]
<em>pH = 9,32</em>
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I hope it helps!
Answer:
The correct answer is Pangea.
Explanation:
Pangea, also spelled Pangaea, in early geologic time, was a supercontinent that incorporated almost all the landmasses on Earth.
Hope this helps!
Answer:
A. Law of constant composition or definite proportion
B. Law of conservation of mass
C. Law of multiple proportion
Explanation:
A. The law of constant composition states that "all pure samples of the same chemical compound contain the same proportion of the elements by mass". Considering the pure same of KCl obtained from different locations, their samples regardless of the procedure used to make them or geography wil be in the same proportion when analysed.
B. Law of conservation of mass states that "mass can neither be created nor destroyed". This law applies to all chemical reactions in which matter is only changed from one form to another. In the bulb, magnessium and oxygen merely combines to magnessium oxide. No loss of matter.
C. Law of multiple proportion states that "when two elements combine to form two or more different compounds, the masses of one of the elements which seperately combine with a fixed mass of the other element are in a simple ratio ".
