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The B4O5(OH)4^2- ion, present in 5.0-Ml of a saturated Na2B4O5(OH)4 solution at a measured temperature, is...

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Chemistry

The B4O5(OH)4^2- ion, present in 5.0-Ml of a saturatedNa2B4O5(OH)4 solution at a measured temperature, is titrated to thebromocresol endpoint with 3.25 mL of 0.291 M HCl.

a) How many moles of B4O5(OH)4^2- are present in the sample?

b) What is the molar concentration of B4O5(OH)4^2- in thesample?

c) Calculate the Ksp for Na2B4O5(OH)4 from this data.

d) What is the free energy change for the dissolution ofNa2B4O5(OH)4 at this temperature?

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