11th Class Chemistry The p-Block Elements-I

  • question_answer 14) Explain what happens when boric acid is heated.

    Answer:

    (a) Boric acid at\[100{}^\circ \text{ }C\], gives metaboric acid. \[{{H}_{3}}B{{O}_{3}}\xrightarrow{100{{\,}^{{}^\circ }}C}HB{{O}_{2}}+{{H}_{2}}O\] At\[160{}^\circ C\], it forms tetraboric acid. \[4{{H}_{3}}B{{O}_{3}}\xrightarrow{160{{\,}^{{}^\circ }}C}{{H}_{2}}{{B}_{4}}{{O}_{7}}+5{{H}_{2}}O\] or\[4HB{{O}_{2}}\to {{H}_{2}}{{B}_{4}}{{O}_{7}}+{{H}_{2}}O\] When strongly heated, it forms boric anhydride or borontrioxide. \[2{{H}_{3}}B{{O}_{3}}\to {{B}_{2}}{{O}_{3}}+3{{H}_{2}}O\]  


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