The correct option from given set of options.

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Chapter 11, Problem 42MC

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The correct option from given set of options.

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8. In a mixture of weak acid and its salt, the ratio of the concentration of acid to salt is increased ten fold. The pH of the solution A. decreases by one B. decreases by one tenth C. increases by one D. increases ten fold 9. In a solution, when the concentrations of a weak acid and its conjugate base are equal, A. the system is not at equilibrium. B. the buffering capacity is significantly decreased. C. the -log of the [H*] and the -log of the K, are equal. D. all of the above are true. 10. Consider a solution which is 0.10 M in CH3COOH and 0.20 M in NaCH;COO. Which of the following statements is TRUE? A. If a small amount of NaOH is added, the pH decreases very slightly. B. If NaOH is added, the OH" ions react with the CH3CO0' ions. C. If a small amount of HCl is added, the pH decreases very slightly. D. If HCl is added, the H* ions react with CH3COOH ions.

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1. When a liquid becomes a solid does it expand or contract? 2.Predict why it is hard to elevate or depress the temperature of water. 3. Compare and contrast how solid solutes and gas solutes differ in their relationship to solubility. Is one more or less soluble than the other, and why? 4. Research one other solute that can depress the temperature of water. Provide the name of the solute and how far it will depress temperature. Does this surprise you? 5.Predict whether large salt crystals or small crystals would lower the temperature faster; explain your answer in detail. a) If a solute dissolves in a solvent, can you retrieve the solute? b) If so, suggest a method to retrieve the solute from your Ziploc bag. c) If not, why not?