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Solubility

AP Chemistry· difficulty 3/5

For O₂ in water at 25 °C, k_H = 1.3×10⁻³ M/atm.

P_O₂ (atm) [O₂] (M) 0.20 2.6×10⁻⁴ 0.50 6.5×10⁻⁴ 1.00 1.3×10⁻³ 2.00 2.6×10⁻³

What does the data confirm?

  • A

    Solubility decreases with P.

  • B

    k_H increases with pressure.

  • C

    [O₂] is directly proportional to P_O₂ (Henry's law).

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  • D

    [O₂] is independent of P.

Explanation

[O₂] = k_H · P_O₂. Each P doubles → [O₂] doubles. Linear relationship confirms Henry's law.

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