DATA: LABORATORY 7 A. Titration of Room Temperature Borax: Ksp1 Molarity of stan

Question

DATA: LABORATORY 7 A. Titration of Room Temperature Borax: Ksp1 Molarity of standard HCI solution: O, 2 M Temperature of room te borate mixture (T): in 2 °C T, in Z1lals K Th Trial 3 (if done) Trial 2 Trial 1 Final buret reading HCl, mL Initial buret reading HCl, mL Volume of HCI used in Titration, mL mL II-1 mL mL 3.28x10 2.28x 3 2.2x10-3 Moles HCl Moles Borate Molarity of Borate Molarity of Na Kspi 12 lx 10 Average Kspr of Borax 2.41 xlQ s Labora T 7 l Finding Equilibrium Constants: The solubility of Bowl

Explanation / Answer

Q4.

For solubility:

Borax --> Na2B4O7

Na2B4O7(s) --> 2Na+(aq) + B4O7-2(aq)

Ksp = [Na+2]^2[B4O7-2]

Frm previous data

[Na+] = 2.75*10^-3

B4O7-2 ( borate ) = 5.7*10^-5

so

Ksp = [Na+2]^2[B4O7-2]

Ksp = (2.75*10^-3)^2 * 5.7*10^-5

Ksp = 4.310*10^-10

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