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11 Dec 2019

The borate ion, [B4O5(OH)4]2-, present in 4.0 mL of a saturated Na2[B4O5(OH)4]·8H2O solution at 48.0 C is diluted to 30.0mL with warm DI water. The resulting solution was titrated to the bromoceresol green endpoint with 20.00mL of 0.250 M HCl.

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

What is the molar solubility of [B4O5(OH)4]2- in the sample?

What is the Ksp of Na2[B4O5(OH)4] from the information above?

Calculate the free energy change for the dissolution of Na2[B4O5(OH)4]·8H2O at given temperature.

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Related questions

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 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 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 25° C?

Using the following information, calculate the number of moles of HCl, Moles of Borate, Concentration of Borate, Ksp, Average Ksp, ΔG (kJ/mol), ΔH (kJ/mol), and ΔS (J/mol*K):

Na2B4O7 • 10H2O(s) -><- 2Na+(aq) + B4O5(OH)42−(aq) + 8H2O(l)

Titration: B4O5(OH)42-(aq) + 2HCl(aq) + 3H2O(l) → 4 B(OH)3(aq) + 2 Cl− (aq)

Molar Mass of B: 10.81g/mol, Molar Mass of O: 16.00g/mol, Molar Mass of H: 1.008g/mol, Molar Mass of Cl: 35.45g/mol

K = [Na+]2 [B4O5(OH)42-]

Ksp = 4 [B4O5(OH)42-]3

ΔG = −RT ln Ksp

ΔG = ΔH – TΔS

−RT ln Ksp = = ΔH – TΔS

a)Titration 1: Temperature: 28.0 degrees C, Concentration of HCl: 0.251 M, Volume of Borax solution (mL): 5.00, Volume of HCl titrated: 2.00 mL

Please do not post the lab that this question comes from because it is hard for me to understand. Please show each individual step and use units along the way to the answer. Thanks!

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

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