(e) You believe that the electrolytes could be linked to the type of chemicals u
ID: 555055 • Letter: #
Question
(e) You believe that the electrolytes could be linked to the type of chemicals used by the farmers. They submitted their list with corresponding solubility and Kow values in this table: Log K Log Kn (g/L at 20'C)(at 20 C) Water Solubility Compound Ammonium Nitrate Urea Carbofuran Melathion Purpose Fertilizer Fertilizer Insecticide Insecticide 1900 1800 0.320 0.013 2.32 2.89 Identify one compound that may contribute to the occurrence of the electrolytes in the water. Why did you select this compound? (i) 12 marks (ii) The following are alternative fertilizers that you can recommend to the farmers. e ammonium phosphate e potassium phosphate e calcium phosphate Using the solubility rules determine the solubility of these fertilizers. Which would you recommend to reduce the presence of electrolytes in the river? [4 markslExplanation / Answer
e) (i) Ammonium nitrate
Ammonium nitrate is made of ammonium ions and nitrate ions. when it is dissolved in polar solvents like water ammonium nitrate dissassociates in to its ions and also its water solubility is compared to other three compounds.
So it behaves as ionic solid.
(note:A compund soluble in water and doesnot produce ions are non electrolytes)
(ii)According to solubility rule ,
Salts containing group one elements( eg: potassum phosphate) are soluble.and also salt containg ammonium salts are also soluble(eg:ammonium phosphate)
phosphate salt such as calcium phosphate arefrequently insoluble .
On comparing these three compounds calcium phosphate is least soluble in aqueos solutions , so it can be used to reduce the presence of electrolyte in water. since it doesnot produce ions in solutions.
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