Reaction 1: CaC2(s) + 2 H2O(l) ⇄ C2H2(g) + Ca(OH)2(s) Reaction 2: NaOCl(aq) + 2 HCl(aq) ⇄ Cl2(g) + N — Equilibrium Chemistry Question
Question
Reaction 1: CaC2(s) + 2 H2O(l) ⇄ C2H2(g) + Ca(OH)2(s)
Reaction 2: NaOCl(aq) + 2 HCl(aq) ⇄ Cl2(g) + NaCl(aq) + H2O(l)
Reaction 3: C2H2(g) + Cl2(g) ⇄ C2H2Cl2(g)
Ca(OH)2(s) precipitates when a 1.0 g sample of CaC2(s) (molar mass 64 g/mol) is added to 1.0 L of distilled water at room temperature. If a 0.064 g sample of CaC2(s) is used instead and all of it reacts, which of the following will occur and why? (The value of Ksp for Ca(OH)2 is 8.0 × 10^−6.)
A.
Ca(OH)2 will precipitate because Q > Ksp.
B.
Ca(OH)2 will precipitate because Q < Ksp.
C.
Ca(OH)2 will not precipitate because Q > Ksp.
D.✓ Correct
Ca(OH)2 will not precipitate because Q < Ksp.
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