Assignment+_3_Key (1) - ETOX 102A Homework#3 Key 1 Colloids...

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ETOX 102A Homework #3 Key 1). Colloids can be defined as a mixture of substances which can exist as particles or as dissolved matter in solution. Two types of commonly found colloids in the environment are hydrophobic and hydrophilic colloids. However, only hydrophobic colloids are capable of “salting out” and undergoing flocculation. Explain the differences between these two similar, but distinct forms of aggregations. (3 pts) Generally, hydrophilic colloids can come from varieties of different sources such as organic material, oil droplets, clay particles…etc. For example, with clay particles, “salting out” is a process by which a cationic (Na + ) shell is formed around an negatively charged colloid, which then electrostatically interacts with counter-ions (Cl - ) to create a salt (1.5 pts). Flocculation, however, is a process which does not use salts within solution to help aggregate. Instead, polyelectrolytes are used along with respective counter-ions to help facilitate the collection.
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