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Deep Raj from DAV PUBLIC SCHOOL, asked a question
Subject: Science , asked on 18/4/12

what does addition of potassium nitrate to ice results in??why and how?

a)increase in melting point

b)decrease in melting point

c)change in colour of ice

d)both (a) &(b)

(please give the answer with explaination)

EXPERT ANSWER

Chandra Prakash , Meritnation Expert added an answer, on 19/4/12
191 helpful votes in Science

Option B is the correction answer because depression in freezing point depends upon the number of atom, ion or molecules present in the solution which decreases the polarity between solvent molecules.  For example: Addition of NaCl to water decreases its freezing point to -9 ° C i.e. at this temperature water will melt also. 

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