The B4O5(OH)4^2- ion, present in 5.0 ml of a saturated Na2B4O5(OH)4 solution at a measured temperature, is titrated to the bromocresol green endpoint with 6.51 mL of 0.146 m HCl.
a) How many oles of B4O5(OH)4^2- are present in the sample?
b) What is the molar concentration of B4O5(OH)4^2- in the sample?
c) Calculate the Ksp for Na2B4O5(OH)4 from this data.
d) What is the free energy change for the dissolution of Na2B4O5(OH)4 at 25° C?