SEPARATION OF SUBSTANCES- POST -7

 GOOD MORNING!!! 

 

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 I am given a MIXTURE containing BOTH SAND  + SALT and have been asked  to separate the two.

  WHAT SHOULD I DO ?  . I am a  bit confused...  Sieving won' t work.. NOR will Hand picking.

Wait a minute. I KNOW that  salt is SOLUBLE in water . Using this property of solubility   I think I know what can be done.

 This is What  I WILL do.  I WILL... ( READ ON)

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       Take a beaker, add some water to the mixture of sand and salt

•  We now have a mixture that contains water + sand + salt

 I now want to separate this mixture.

  WHAT NEXT ???

  I  know that salt is soluble in water but sand isn't.

•  Take a glass rod and stir the mixture.

•  The salt dissolves on stirring and the salt is no longer visible.
•  Filter the solution.
•  Sand remains on the filter paper as the RESIDUE and SALT SOLUTION is the FILTRATE
•  IF the salt solution is  heated, water will EVAPORATE leaving SALT behind.

Thus a mixture of  WATER + SALT +SAND is separated.

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DO THE QUESTION IN YELLOW  IN YOUR NOTE BOOK.

Q. Explain how will you separate a mixture of salt,sand and water. Support your answer with a diagram.  (draw both the diagrams given below )

ANS:

The salt solution is heated.

The water gets evaporated and pure salt is left in the beaker.

( answer ends here)

Watch the activity in the following video:

 https://www.youtube.com/watch?v=tQdvPTPlU1M

                      &

https://www.youtube.com/watch?v=dwsKpY70iTA

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Look at the illustration for a quick recap  where in a mixture of sugar and sand is separated.

 

  How is a mixture of iron , sand and salt separated. Click on the link below.

 https://www.youtube.com/watch?v=1wJ0CA0GoC8&t=5s

   video. NOW that you have watched the  video.  List out the  steps  to be followed in the comments.

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 How can we get a pure  sample of common salt from an impure sample 

 of  common   salt.?

 The sequence of the steps to be followed is given in the picture below.

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L

 This is all today!