e. How much oxygen (kg), if any, is required to complete the reaction? Er L t. O

Question

e. How much oxygen (kg), if any, is required to complete the reaction? Er L t. Outline how you would calculate the reaction constant (Kg) for this compound 7.The calcium hydrex tion mixes with water to settle hardness. However, the nte completely dissociate in step 1. So, assuming the Keq value for this reaction is 100, and the pH is 10, whati's the concentration of calcium hydroxide in the water? (3 pts) Relax, take your time and best of luck. he hydroxide ions to separate from the calcium. Assume they 10 o o H

Explanation / Answer

Given that compound is Ca(OH)2

Ca(OH)2 ------> Ca+2 + 2 OH-

Keq = [Ca+2][OH-]^2/[Ca(OH)2]

we have pH = 10 then pOH = 14 - pH = 14 -10 = 4

pOH = 4

-log(OH-) = 4

[OH-] = 10^-4

from the equation 1 mole of Ca(OH)2 produces 1 mole of Ca+2 and 2 moles of OH- ions then,

[Ca+2] = 10^-4/2 = 5*10^-5

Substituting all the values in Keq eqaution then,

100 = (5*10^-5)*(10^-4)^2/[Ca)OH)2]

concentration of Ca(OH)2 = 5 * 10^-15

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