Exset7 - Nielsen CHM1041 Exercise Set 7 Ionic Equilibria I...

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Nielsen Bhaskar/PC/1713J/A 2/05 1 CHM1041 Exercise Set 7 Ionic Equilibria I 1. By choosing the proper temperatures, both NaCl (normally a solid) and HCl (normally a gas) are liquids. But liquid NaCl is a good conductor of electricity and liquid HCl is not. Why is this? On the other hand, a water solution of either substance at room temperature is a good conductor. Explain why. 2. Calculate the concentration of each of the ions in the following solutions of strong electrolytes: (a) 0.0090 M HBr (b) 0.0102 M Li 2 S0 4 (c) 0.0033 M [Al (H 2 0) 6 ] 2 (S0 4 ) 3 3. Show by suitable equations that the following species are bases in water: NH 3 , HS -1 , CH 3 C0 2 -1 , and 0 -2 . 4. Show by suitable equations that the following species are acids in water: HBr, HN0 2 , HBr0 4 , and PH 4 +1 . 5. Substances that exhibit both acidic and basic properties are said to be “amphoteric.” The existence of such substances is rather easily understood in terms of Bronsted-Lowry theory. Which of the following is amphoteric? (Hint: Which can either gain or lose protons?) (a) 0H -1 (b) NH 3 (c) H 2 0 (d) HS -1 (e) N0 3 -1 (f) HC0 3 -1 (g) HS0 4 -1 (h) HN0 3 6. Illustrate with equations two forms of representing the ionization of hydrazoic acid in water. 7. Write the simplified equations to show all the theoretically possible steps in the ionization in water solution of each of the following. Also give the K a or K b expression for each ionization. (a)
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Exset7 - Nielsen CHM1041 Exercise Set 7 Ionic Equilibria I...

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