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lora16 [44]
4 years ago
8

What is the hydroxide ion concentration of a solution that has a pH of 8.57?

Chemistry
1 answer:
Inessa [10]4 years ago
4 0
Calculate the pOH first :

pOH =14-8.57=5.43

(OH)=10^-5.47
(OH)=3.72 x 10^-6 mol/L
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Answer:

0.666 mol I

Explanation:

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5 0
4 years ago
At 20 °C the vapor pressure of pure benzene (C6H6) is 75.0 torr, and that of toluene (C7H8) is 22.0 torr. Assume that benzene an
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Answer:

mole fraction benzene = 0.62

mole fraction toluene   = 0.38

Explanation:

Raoults law for ideal solutions tells us that the totoal vapor pressure of the solution will be given by adding the partial pressures of the components of  the solution and the partial pressures are simply given by the product of the component in solution times its pure vapor pressure at the temperature given:

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Solving the algebraic equation:

75 x₁ + 22 x₂  = 55

75 x₁ + 22 ( 1- x₁) = 55   (since x₁ + x₂ = 1)

75 x₁ + 22 - 22 x₁ = 55

53 x₁  = 33

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x₂ = 1 - 0.62 = 0.38

6 0
3 years ago
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