Question

what is the solubility product of borax at each of the measured temperatures?

Group Average Std. Dev RSD (%) Sample Temp (CHCI (mL) 4.82 1.35 27.92 6.790.9914.55 13.08 2.09 15.95 15.76 0.966.12 27.492.20

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Answer #1

1) T = (273 + 4.5) = 277.5 K

ln Ksp = - 9525.5 / T + 27.628

or

ln Ksp = - 9525.5 / 277.5 + 27.628

or

Ksp = 1.23 * 10^-3

2) T = (273 + 21.5) = 294.5 K

ln Ksp = - 9525.5 / T + 27.628

or

ln Ksp = - 9525.5 / 294.5 + 27.628

or

Ksp = 8.95 * 10^-3

3) T = (273 + 37.0) = 310 K

thus

Ksp = 4.51 * 10^-2

4) T = (273 + 43.0) = 316 K

Ksp = 8.07 * 10^-2

5) T = (273 + 53.5) = 326.5 K

Ksp = 0.213

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