common sense question, i just dont know how to ans

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Why must the test tubes be thoroughly cleaned and dried when one part of the procedure is completed before starting the next part of the procedure ?

Please help me with this, thankyou so much!

  • common sense question, i just dont know how to ans -

    Don't you want to make sure that all of the old gunk is out of the tube before putting in new stuff?

  • common sense question, i just dont know how to ans -

    yes i know the answer too , but i don't know how to word it, lol that's why i posted it:)

  • common sense question, i just dont know how to ans -

    Wash and dry the test tubes thoroughly to be sure any new substances are not contaminated by any other substance.

  • common sense question, i just dont know how to ans -

    thank you Ms.Sue:)

  • common sense question, i just dont know how to ans -

    You're welcome, Sky.

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