Answer: X3+
Explanation:
Every atom aim to achieve stability by receiving electrons or giving their valence electrons in order to have a complete outermost shell of 2 (duplet) or 8 (octet structure).
In this case, the atom X will easily give off its three valence electrons to another atom(s), thereby forming a trivalent positive ion (X3+) with a stable duplet or octet structure (i.e an outermost shell with 2 or 8 electrons).
X --> X3+ + 3e-
Thus, due to the give away of three electrons (3e-), the atom X becomes X3+.
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This is an incomplete question, here is a complete question.
Calculate the volume in milliliters of a 1.29 mol/L iron(II) bromide solution that contains 275 mmol of iron(II) bromide . Round your answer to significant 3 digits.
Answer : The volume of iron(II) bromide solution is, 
Explanation : Given,
Concentration of iron(II) bromide = 1.29 mo/L
Moles of iron(II) bromide = 275 mmol = 0.275 mol
conversion used : 1 mmol = 0.001 mol
Now we have to calculate the volume of iron(II) bromide.
Now put all the given values in this formula, we get:
Thus, the volume of iron(II) bromide solution is,
Answer:
pH = 2.97
Explanation:
Aspirin, (HC₉H₇O₄), is in equilibrium with water, thus:
HC₉H₇O₄(aq) + H₂O(l) ⇄ C₉H₇O₄⁻(aq) + H₃O⁺(aq)
Ka = 3.0x10⁻⁴ = [C₉H₇O₄⁻][H₃O⁺] / [HC₉H₇O₄]
When you add 0.0050M of aspirine, the solution reach equilibrium when concentrations are:
[HC₉H₇O₄] = 0.0050M - x
[C₉H₇O₄⁻] = x
[H₃O⁺] = x
Replacing in Ka formula:
3.0x10⁻⁴ = [x][x] / [0.0050-x]
1.5x10⁻⁶ - 3.0x10⁻⁴X = X²
X² + 3.0x10⁻⁴X - 1.5x10⁻⁶ = 0
Solving for x:
x = - 0.00138 → False answer. There is no negative concentrations
x = 0.00108 → Right answer
As [H₃O⁺] = x; [H₃O⁺] = 0.00108M.
pH = -log[H₃O⁺]
<em>pH = 2.97</em>
