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Sample of saturated borax

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Reference no: EM132412889

The solubility of borax in water is described by the equilibrium:

Na2[B4O5(OH)4] 8H2O(s) <---> 2Na^+(aq) + B4O5(OH)4^2-(aq)

A 5 mL sample of a saturated borax solution at 40*C was pipetted into a 125-mL Erlenmeyer flask containing 5 mL of distilled water. An additional 20 mL of distilled water and 4 drops of bromocresol green indicator was added. The solution was titrated with 25.22 mL OF 0.5 M HCl according to:

B4O5(OH)4^2-(aq) + 3H2O(l) + 2H^+(aq) --->4H3BO3(aq)

a. What color change was observed when the endpoint of this titration was reached?

b. Based on this data determined concentration of tetraborate ions, B4O5(OH)4^2-, and KSP at 40*C

Ksp = [Na^+]^2[B4O5(OH)4^2-]

C. If a 5 mL sample of saturated borax had been collected at 35*C, would the more, less, or the same volume of 0.5 M HCl be needed to reach the endpoint?

Reference no: EM132412889

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