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With this experiment, why are you adding HCL dropwise

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    http://www.4college.co.uk/as/atm/halo.php
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    It does not say dropwise!

    But you add slowly for 2 reasons:

    1. You do not want a sudden release of large amounts of gas.
    2. You do not want the reaction mixture to get very hot.

    Both of the above could lead to explosion/ are hazardous.
 
 
 
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