Give the test that is used to detect borate radicals is qualitative analysis. - Chemistry

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Give the test that is used to detect borate radicals is qualitative analysis.

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Solution

  1. Borax when heated with ethyl alcohol and concentrated H2SO4, produces volatile vapours of triethyl borate, which burns with green edged flame.
    a. \[\ce{\underset{Borax}{Na2B4O7} + \underset{(conc.)}{H2SO4} + 5H2O ->[\Delta]\underset{Sodium sulphate}{Na2SO4} + \underset{Orthoboric acid}{4H3BO3}}\]
    b. \[\ce{\underset{Orthoboric acid}{H3BO3} + \underset{Ethyl alcohol}{3C2H5OH}->\underset{Triethyl borate}{B(OC2H5)3} + 3H2O}\]
  2. The above reaction is used as a test for the detection and removal of borate radical \[\ce{(BO^3-_3)}\] in qualitative analysis.
Concept: Chemistry of Notable Compounds of Elements of Groups 13, 14 and 15
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Chapter 9: Elements of Group 13, 14 and 15 - Exercises [Page 134]

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Balbharati Chemistry 11th Standard Maharashtra State Board
Chapter 9 Elements of Group 13, 14 and 15
Exercises | Q 11 | Page 134

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