Why are colloid particles charged?

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physics kiddy
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I was amazed to read that colloid particles are charged. Please explain how is it so.
 

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Perhaps you could explain what you are asking in a bit more detail. A colloidal suspension will have counterions present as well. So while the colloidal particles are charged, the solution is neutral as a whole.

Other than that potential conundrum, I'm not sure what you are inquiring about with regard to colloids.
 

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