Na2b4o7 + 2h2so4 (конц ) + 12c2h5oh = 4b(c2h5o)3 + 2nahso4 + 7h2o (комн )
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Na2b4o7 2h2so4 конц 12c2h5oh C2h5o 2nahso4 7h2o комн
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