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76-Sol-Products-Ans

# 76-Sol-Products-Ans - GCHEM II LAB SOLUBILITY PRODUCTS...

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GCHEM II LAB SOLUBILITY PRODUCTS CONCEPT PROBLEMS (Use Appendix D page 1127 text book to find Solubility Products Constants) 1. A saturated solution of AgCl at 25.0 o C was found at equilibrium to be 1.35 x 10 -5 M in AgCl. Assuming that AgCl dissociates to form Ag +1 and Cl -1 ions , what is the Ksp for AgCl ? R eaction AgCl(s) Ag +1 (aq) + Cl -1 (aq) I nitial (moles/L) excess 0 0 C hange (+/–) – 1.35 x 10 -5 + 1.35 x 10 –5 + 1.35 x 10 -5 E quil or C omp (excess – 1.35 x 10 -5 ) 1.35 x 10 -5 + 1.35 x 10 –5 Ksp = [Ag] [Cl] = [1.35 x 10 -5 ] [1.35 x 10 -5 ] = 1.8225 x 10 -10 Ksp = 1.82 x 10 -10 2. What is the solubility (moles/L and grams /L) of calcite (CaCO 3 ) in ocean water at 10.0 o C ? R eaction CaCO 3 (s) Ca(aq) +2 + CO 3 (aq) -2 I nitial (moles/L) excess 0 0 C hange (+/–) – x + x + x E quil or Comp (excess – x) x x Ksp for CaCO 3 = 4.5 x 10 -9 ; Ksp = (x) (x); x 2 = 4.5 x 10 -9 ; x = 6.708 x 10 -5 mole/L 6.7 x 10 -5 moles/L 6.708 x 10 -5 moles CaCO 3 100.09 grams CaCO

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76-Sol-Products-Ans - GCHEM II LAB SOLUBILITY PRODUCTS...

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