What is the molar concentration of a 4% solution of borax ? (sodium tetraborate decahydrate Na2B4O7 * 10H2O)

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Hubert KochLv2

13 Dec 2019

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Calculate the Molarity of a 22.00% (wt/wt) solution of sodium sulfate decahydrate (Na2SO4-10H2O). Assume 20 degrees C and the density of the solution is 1.2106 g/mL.

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Write a balanced net ionic equation to explainthe observed pH for each of the solutions tested.

Ammonium Chloride NH4Cl (4.4-4.8pH)
Boric acid H3BO3 (4.4-4.8)
Borax Na2B4O7 (9-10)
Citric acid C6H8O7 (1.8-2.8)
Hydrochloric Acid HCl (1.8-2.8)
Sodium carbonate Na2CO3 (9-10)

Question 3 (8 marks) Borax (Na2B4O7Â·10H2O, MW 381.367) can be used to standardise HNO3. Titration of 0.2347 g borax required 19.25 mL HNO3 solution. What is the molarity of the nitric acid solution? Borax reacts in the following way: B4O72- + 2 H+ + 5H2O â 4B(OH)3

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What is the molar concentration of a 4% solution of borax ? (sodium tetraborate decahydrate Na2B4O7 * 10H2O)

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