unit 3 solution test

Part A: Knowledge Understanding- Multiple Choice (15 marks) Identify the choice that best completes the statement or answers the question 1. Which of the following is true when a solution undergoes cooling? a) Increases its solubility b) Increases its concentration c) Decrease its concentration d) Decreases its solubility 2. Sodium chloride is added to a beaker filled with water. After stirring thoroughly, it is observed that some crystals remain undissolved at the bottom of the solution. This solution can be assumed to be: a) Unsaturated c) Supersaturated b) Saturated d) Not enough information 3. Which of the following is a triprotic acid? a) H3PO4 b) HCl c) HCO; d) CHeO 4. A sample of water contains dissolved lead ions (Pb**). Which of the following salts could be added to precipitate the lead ions out of solution? a) Sodium Chloride c) Calcium Hydroxide b) Potassium Iodide d) Silver Nitrate 5. A sample of water contains sulfate ions (SO,*). Which of the following salts could be added to precipitate sulfate ions out of solution? a) Magnesium Chloride c) Sodium Phosphate b) Aluminum Bromide d) Lead (IT) Nitrate