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(1) Boric acid sample (H3BO3) contains boron (Na2B4O7.10H2O) as impurity. The quantity of this sample was...

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Chemistry


(1) Boric acid sample (H3BO3) contains boron (Na2B4O7.10H2O)as impurity. The quantity of this sample was dissolved in distilledwater to give 1 liter of A solution.
(a) 25.00 cm3 of solution A required 8.80 cm3 of 0.01M HClsolution for neutralizing, using methyl red as indicator.
(b) In another 25.00 cm3 of A was added 8.80 cm3 of the 0.01MHCl solution, and some cm3 of glycerol was added. The result is auniform colorless solution. The final solution was found to beequivalent to 27.30 cm3 of 0.1M NaOH solution, usingphenolphthalein indicator. Find the purity of boric acid.

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