Answered: An unknown hydroxide of the formula…

Introductory Chemistry: A Foundation

9th Edition

ISBN:9781337399425

Author:Steven S. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Donald J. DeCoste

Chapter10: Energy

Section: Chapter Questions

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An unknown hydroxide of the formula X(OH)2 is only slightly soluble in water. A scientist is curious as to what hydroxide this is. So, she takes this hydroxide and dissolves enough of it in pure water to make a saturated solution. She then takes 25.00 mL of the saturated solution and titrates it with 0.000100 M HCl. She notes that it takes 2.58 mL of HCl to fully neutralize the saturated solution.

a) Determine the pH of the saturated solution before titration.

b) Determine the molar solubility of the hydroxide in mol/L (Hint: it may help to draw an ICE table for this part and the next part).

c) Determine the Ksp of the hydroxide.

d) Determine the identity of the hydroxide. (use the Ksp table provided)

Hydroxides
Ва(ОН)2 | 5.0 х 10:3
Sr(ОH)2 | 6.4 х 103
Cа(ОН)2 | 4.7 х 10-6
Mg(ОН)2 | 5.6 х 10-12
Mn(ОН)2 | 2.1 х 10°13
Ca(ОН)2 | 5.3 х 10-15
PЫОН)2 | 1.2х 10:15
Fe(ОH)2 | 4.9 х 10:17
Ni(OH)2 | 5.5 х 10:16
Со(ОН)2 | 1.1 х 10:15
Zn(OH)2 | 4.1 х 10:17
Cu(ОН)2 | 1.6 х 10:19
Hg(ОН)2 | 3.1 х 10-26
Sn(OH)2 | 5.4 х 10:27
Cr(ОН)з | 6.7 х 10:31
Al(ОН)3 | 1.9 х 1033
Fe(ОH)з | 2.6 х 10:39

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