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Impurities usually refer to small amounts of chemical substances in a finite quantity of a "host" substance or material. The word "impurities" connotes substances that are present usually in small quantities, but which were probably there to begin with and need to be removed to make the desirable part "pure". One example is hard water, with natural salts as impurities to begin with. But when some coffee is mixed deliberately with a specific aim, the term impurity is grossly inappropriate. It may be termed a solute or, better an ingredient for the preparation of a solution useful for a particular purpose.
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I wrote it frm my bro's 9th class book osi don't knw itz r8 or wrng
It's correct. I am a 10th grade boy.
Anjali is right because if it is said "coffee" , then it is probably a desirable thing and cannot be regarded as an impurity, because here we are adding coffee to water purposely, so it can't be impurity. those things which are undesirable and come in our way without our notice, then that thing can be called as impurity.