Which of the following compounds precipitates from a solution that has the concentrations indicated? a. CaCO3: [Ca²+] = 0.003 M, [CO3²¯] = 0.003 M b. Co(OH)2: [Co²+] = 0.01 M, [OH-] = 1 × 10-7 M c. CaHPO4: [Ca2+] = 0.01 M, [HPO4²¯] = 2 × 10-6 M

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### Precipitation of Compounds

In this exercise, we are examining the conditions under which certain compounds precipitate out of solutions with specific ion concentrations. The compounds discussed and their corresponding ion concentrations are given as follows:

---

#### Problem Statement:

Which of the following compounds precipitates from a solution that has the concentrations indicated?

#### Compounds and Ion Concentrations:

a. **Calcium Carbonate (CaCO₃):**
   - \([Ca^{2+}] = 0.003 \, \text{M}\)
   - \([CO₃^{2-}] = 0.003 \, \text{M}\)

b. **Cobalt(II) Hydroxide (Co(OH)₂):**
   - \([Co^{2+}] = 0.01 \, \text{M}\)
   - \([OH^-] = 1 \times 10^{-7} \, \text{M}\)

c. **Calcium Hydrogen Phosphate (CaHPO₄):**
   - \([Ca^{2+}] = 0.01 \, \text{M}\)
   - \([HPO₄^{2-}] = 2 \times 10^{-6} \, \text{M}\)

---

The goal is to determine whether any of these compounds will precipitate based on the given concentrations of their constituent ions in the solution.

To solve this, the solubility product constant (Ksp) for each compound must be considered. If the product of the ion concentrations exceeds the Ksp, precipitation occurs.

For educational purposes, understanding the concept of solubility product (Ksp) and how it dictates the solubility of ionic compounds is essential. It helps predict whether a salt will precipitate when its ions are present in a solution.
Transcribed Image Text:### Precipitation of Compounds In this exercise, we are examining the conditions under which certain compounds precipitate out of solutions with specific ion concentrations. The compounds discussed and their corresponding ion concentrations are given as follows: --- #### Problem Statement: Which of the following compounds precipitates from a solution that has the concentrations indicated? #### Compounds and Ion Concentrations: a. **Calcium Carbonate (CaCO₃):** - \([Ca^{2+}] = 0.003 \, \text{M}\) - \([CO₃^{2-}] = 0.003 \, \text{M}\) b. **Cobalt(II) Hydroxide (Co(OH)₂):** - \([Co^{2+}] = 0.01 \, \text{M}\) - \([OH^-] = 1 \times 10^{-7} \, \text{M}\) c. **Calcium Hydrogen Phosphate (CaHPO₄):** - \([Ca^{2+}] = 0.01 \, \text{M}\) - \([HPO₄^{2-}] = 2 \times 10^{-6} \, \text{M}\) --- The goal is to determine whether any of these compounds will precipitate based on the given concentrations of their constituent ions in the solution. To solve this, the solubility product constant (Ksp) for each compound must be considered. If the product of the ion concentrations exceeds the Ksp, precipitation occurs. For educational purposes, understanding the concept of solubility product (Ksp) and how it dictates the solubility of ionic compounds is essential. It helps predict whether a salt will precipitate when its ions are present in a solution.
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