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

(1) Boric acid sample (H3BO3) contains boron (Na2B4O7.10H2O) as impurity. The quantity of this sample was dissolved in distilled water to give 1 liter of A solution.

(a) 25.00 cm3 of solution A required 8.80 cm3 of 0.01M HCl solution for neutralizing, using methyl red as indicator.

(b) In another 25.00 cm3 of A was added 8.80 cm3 of the 0.01M HCl solution, and some cm3 of glycerol was added. The result is a uniform colorless solution. The final solution was found to be equivalent to 27.30 cm3 of 0.1M NaOH solution, using phenolphthalein indicator. Find the purity of boric acid.

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Expert Solution

queen_honey_blossom answered 11 months ago

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