Constants | Periodic Table Describe the solubility of CaF2 in each of the follow

Question

Constants | Periodic Table

Describe the solubility of CaF2 in each of the following solutions compared to its solubility in water.

Part A

in a 0.10 molL1NaCl solution

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Part B

in a 0.10 molL1NaF solution

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Part C

in a 0.10 molL1HCl solution

Constants | Periodic Table

Describe the solubility of CaF2 in each of the following solutions compared to its solubility in water.

Part A

in a 0.10 molL1NaCl solution

in a 0.10  solution The solubility will increase. The solubility will be less. The solubility will be unchanged.

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Part B

in a 0.10 molL1NaF solution

in a 0.10  solution The solubility will increase. The solubility will be less. The solubility will be unchanged.

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Part C

in a 0.10 molL1HCl solution

in a 0.10  solution The solubility will increase. The solubility will be less. The solubility will be unchanged.

Explanation / Answer

Part A) In a 0.10 molL1NaCl solution

CaF2 has no common ion with NaCl, therefore the solubility will be unchanged

Part B) In a 0.10 molL1NaF solution.

Here, the common ions decrease the solubility of CaF2. Therefore, the solubility will be less.

Part C) In a 0.10 molL1 HCl solution

Here, the acid increases the solubility of CaF2. The chloride ions act as spectator ions, leaving the protons and push the equilibrium reaction to the right. Therefore, the solubility will increase

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