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Question

When 25 ml of H2O2 solution having volume strength of 4.48, is treated with borax in presence of NaOH solution, the no. of millimoles of sodium perborate formed is:

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Solution

Molar concentration of H2O2 solution of volume strength 4.48=4.4811.2=0.4M
So, mmols of H2O2 in 25 ml solution =0.4×25 mmols
Na2B4O7+4H2O2+2NaOH2Na2B2O4(OH)4+H2O
So, mmols of sodium perborate formed = 5 mmols

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