Assignment_2_Key (4) - ETOX 102A Homework#2 KEY 1 Chemical...

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ETOX 102A Homework #2 KEY 1). Chemical solubility in water is heavily influenced by two important factors: size of compound and the ability to electrostatically interact with the partial charges of water molecules (i.e. dissolution). However, when large quantities of salt (Na + Cl - ) are added to water, there is reduction in the ability to dissolve chemical compounds. Generally, how does the addition of salts change water solubility? Moreover, when water freezes at 0C, ice becomes less dense than in liquid state. What unique chemical formation causes ice to float? What underlying electrostatic interaction supports this formation? (3 pts) Adding salts (Na + Cl - ) to water leads to an increase in “ionic strength.” With more ions present, water decreases its ability to accommodate dissolution of other organic compounds (i.e. less free water molecules are available for interaction to dissolve chemicals) (1 pt). Clathrates or clathrate hydrates are formed when liquid water freezes (1 pt). Clathrate hydrates are supported by H- bond interactions. In liquid water, there is continuous formation and breakage of H-bonds
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  • Winter '10
  • RonaldTjeerdema
  • Chemistry

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