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Ans_Ex7 - Nielsen CHM1041 Answer to Exercise set 7 Ionic...

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Nielsen Bhaskar/PC/1713K/A 2/05 1 CHM1041 Answer to Exercise set # 7 Ionic Equilibria I 1. By choosing the proper temperatures, both (normally a solid) and (normally a gas) are liquids. But liquid is a good conductor of electricity and liquid is not. Why is this? On the other hand, a water solution of either substance at room temperature is a good conductor. Explain why. NaC1 HC1 NaC1 HC1 NaC1 is an ionic solid at room temperature and incapable of conducting electricity as a solid. Mobile ions are required for the conduction of electric current, and the ions of solid are locked in the crystal lattice. As a liquid at higher temperatures (molten state), the ions become mobile and the conduction of current is possible. Hydrogen chloride, is a polar covalent molecule and cannot conduct electric current as a solid, pure liquid, or gas. In water solution, however, both and produce 100% ions and both conduct current. NaC1 HC1, NaC1 HC1 100% ( ) ( ) ( ) 2 H O s +1 -1 aq NaC1 Na + C1 aq ⎯⎯⎯→ ( ) ( ) ( ) 2 3 +1 -1 2 g a H O HC1 + H O H O C1 ⎯⎯⎯→ + q aq 100% 2. Calculate the concentration of each of the ions in the following solutions of strong electrolytes: (a) 0.0090 M HBr ( ) ( ) 2 H O +1 1 ag HBr H Br ag ⎯⎯⎯→ + 100% 0.0090 M 0.0090 M (b) 2 4 0.0102 M Li SO 100% ( ) ( ) ( ) 2 2 H O 4 s +1 -2 4 ag ag Li SO SO 2 Li + ⎯⎯⎯→ 0.0090 M 0.0102 M (c) ( ) ( ) 2 4 6 3 2 0.0033 M A1 H O SO ( ) ( ) ( ) ( ) ( ) 2 H O 2 +3 -2 2 4 6 3 s 6 ag 2 A H O SO 2 A H O + 3 SO ⎯⎯⎯→ A A 4 0.0066 M 0.0099 M
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