The hydroxide ion has the formula OH. The solubility-product constants for three
ID: 538804 • Letter: T
Question
The hydroxide ion has the formula OH. The solubility-product constants for three generic hydroxides are given here.
The removal of an ion is sometimes considered to be complete when its concentration drops to 1.00×106 M. What concentration of hydroxide would cause Y2+ to "completely" precipitate from a solution? find [OH] =
2.How many grams of dry NH4Cl need to be added to 2.20 L of a 0.400 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.65? Kb for ammonia is 1.8×105. find mass of NH4Cl =
Generic hydroxide Ksp XOH 3.10×108 Y(OH)2 1.20×1010 Z(OH)3 8.40×1015Explanation / Answer
1 )
Y(OH)2 --------------------> Y+2 + 2OH-
S 2 S
Ksp = [Y+2] [OH-]^2
1.20 x 10^-10 = 1.0 x 10^-6 x [OH-]^2
[OH-] = 0.0110 M
2)
moles of NH3 = 2.20 x 0.400 = 0.88
pOH = 14 - pH
= 14 - 8.65
= 5.35
pKb = 4.74
pOH = pKb + log [NH4Cl / NH3]
5.35 = 4.74 + log (NH4Cl / 0.88)
NH4Cl / 0.88 = 4.07
NH4Cl moles = 3.58
mass of NH4Cl = 3.58 x 53.5
= 192 g
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