Wednesday, September 30, 2020

Properties Of Boric Acid

                Boric acid reacts with sodium hydroxide to form sodium metaborate and sodium tetraborate. 

                   H3BO3  +  NaOH  ———>  NaBO2  +  2H2O

                  4H3BO3  +  2NaOH  ———>  Na2B4O7  +  7H20

Action Of Heat:

              Boric acid heated above 170 degree Celsius to gives metaboric acid.

                                 4H3BO3  ———>  4HBO2  +  H20

              Boric acid heated above 300 degree Celsius to gives tetraboric acid.

                               4HBO2   ———>  H2B4O7  +  H2O

             Tetraboric acid heated above 330 degree celsius to gives boron trioxide.

                               H2B4O7  ———>  2B2O3  +  H2O

Action Of Ethyl Alcohol:

              Boric acid reacts with ethyl alcohol in the presence of concentrated sulphuric acid to form triethylborate. The ethyl borate burns with green edged flame.

                              4H3BO3  +  3C2H5OH   ———>   B(OC2H5)3  +  3H2O

Action Of Calcium Fluoride:

            Boric acid reacts with calcium fluoride in the presence of concentrated sulphuric acid to gives boron trifluoride.

                            2H3BO3  +  3CaF2  +  3H2SO4   ———>  2BF3  +  3CaSO4  +  6H2O

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