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Questions 5.3

  1. What type of bond exists between sodium and chlorine in solid sodium chloride?

  2. What is the structure of solid sodium chloride? Explain.

  3. Write the formulae of sodium ions and chloride ions, indicating their state symbols when dissolved in water.

  4. Which ions move to the anode and which ones move to the cathode?

  5. Explain why sodium chloride conducts electricity in aqueous solution but not in solid state.

  6. Identify at least 5 other substances that conduct electricity in aqueous solutions but not in solid state (Consider solubility as well).




Answers to Questions 5.3

  1. Ionic bond
  2. Giant ionic structure. Ionic bonds lead to structures that extend in all directions.
  3. Na+(aq) and Cl-(l)
  4. Chloride ions (Cl-) move to the anode; sodium ions (Na+) move to the cathode.
  5. In aqueous solution, the positive sodium ions are separated from the negative chloride ions; so they move about freely. In solid state, the positive and negative ions are held together by strong ionic bonds; so they are not free to move about.
  6. KCl, K2SO4, CuSO4, Zn(NO3)2, Na2CO3, and any soluble salt, acid, or soluble base.