How many grams are in 2.12 x 10-2 moles of calcium phosphate, Ca3(PO3)2?
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Answer:
[H₂O] > [H₃O⁺] ≳ [Cl⁻] > [OH⁻] > [HCl]
Explanation:
HCl + H₂O ⟶ H₃O⁺ + Cl⁻
HCl dissociates completely in solution.
[HCl] = 0 mol·L⁻¹
[H₃O⁺] = 1.0 × 10⁻⁶ mol·L⁻¹
[Cl⁻] = 1.0 × 10⁻⁶ mol·L⁻¹
[H₃O⁺] is slightly greater than [Cl⁻] because the autoionization of water also creates some hydronium ion.
1 L of water has a mass of 1000 g.
∴ [H₂O] = 55.49 mol·L⁻¹
∴ [H₂O] > [H₃O⁺] ≳ [Cl⁻] > [OH⁻] > [HCl]
55.5 10⁻⁶ 10⁻⁶ 10⁻⁸ 0