Question

Hoping you could help me with a chemistry problem. I have a quiz tomorrow and am unsure on how to solve this problem. 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 5.28 mL of .182 M HCl. Express all calculations with the correct number of significant figures. 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 the sample? c) Calculate Ksp for Na2B4O5(OH)4 from these data. d) What is the free energy change for the dissolution of Na2B4O5(OH)4 at 25 degrees celcius? R= 8.314 x 10^-3 kj/mol K