A student set-up the apparatus below in order to determine the percentage by volume of oxygen in air.

      

A student set-up the apparatus below in order to determine the percentage by volume of oxygen in air.

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a) Why did water rise when the reaction had stopped?

b) The student wrote the expression for the percentage by volume of oxygen in air as
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Why was the volume of oxygen calculated using the above expression incorrect?

c) What should have been done after the reaction had stopped in order to get a correct volume.

  

Answers


Martin
a) To occupy space previously occupied by oxygen that was used by smouldering phosphorous.

b) Because oxides of phosphorous formed still occupy space enviously occupied by oxygen.

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c) Let all the fumes dissolve in water before final reading is taken
marto answered the question on October 1, 2019 at 08:08


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