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Using melting point to determine pure products watch

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    Attachment 589898589896hi, can someone explain this question because I don't understand why the melting point of the pure product will differ from the actual data. I have no idea what you will observe either.

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    (Original post by coconut64)
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Size:  322.2 KBhi, can someone explain this question because I don't understand why the melting point of the pure product will differ from the actual data. I have no idea what you will observe either.

    Thanks
    Hi so I can't read the question as am on my phone
    But what i can tell you hopefully shall help you.
    When taking a mpt test.
    You put your solid into a tiny tube and put it in the machine.
    You observe the solid going to a liquid and record the temperature this happens at

    Your sample is pure if, this value obtained, is close to that of the true value (ie: 1 exact temperature with a low percentage difference )

    It is impure if it is within a range of temperatures or if it is far from the true value (high percentage difference )

    Fingers crossed this helps, apologies for lack of specifism
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    (Original post by coconut64)
    Attachment 589898589896hi, can someone explain this question because I don't understand why the melting point of the pure product will differ from the actual data. I have no idea what you will observe either.

    Thanks
    In terms of why pure aspirin may appear not to melt at 135oC. Melting points are affected by pressure. The temperature given will be at standard pressure but in reality the lab pressure might differ from this a little bit.
 
 
 
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