Morphine is an effective pain killer but is also highly addictive. calculate the ph of a 0.115 m solution of morphine if its pkb = 5.79.

Question

Nyla Hogan

Chemistry

5 February, 06:13

Morphine is an effective pain killer but is also highly addictive. calculate the ph of a 0.115 m solution of morphine if its pkb = 5.79.

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Mattie Moon · Answer 1

Answer is: pH value of morphine is 10.64.

Chemical reaction: C₁₇H₁₉NO₃ + H₂O → C₁₇H₁₉NO₃H⁺ + OH⁻.

Kb (C₁₇H₁₉NO₃) = 10∧ (-5,79) = 1,62·10⁻⁶.

c (C₁₇H₁₉NO₃) = 0,115 M.

Kb (C₁₇H₁₉NO₃) = c (OH⁻) · c (C₁₇H₁₉NO₃H⁺) : c (C₁₇H₁₉NO₃).

c (OH ⁻) = c (C₁₇H₁₉NO₃H⁺) = x.

1,62·10⁻⁶ = x² : (0,115 - x).

Solve quadratic equation: x = c (OH ⁻) = 0,000431 M.

pOH = - log (0,000431 M) = 3,36.

pH = 14 - 3,36 = 10,64.