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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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tony2012 tony2012
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11 years ago
Sodium hydroxide solution is usually standardized by titrating a pure sample of potassium hydrogen phthalate (KHP), an acid with one acidic hydrogen and a molar mass of 204.22 g. It takes 38.90 mL of a sodium hydroxide solution to titrate a 0.1235 g sample of KHP. What is the molarity of the sodium hydroxide?
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#1
11 years ago
C8H6O4¯(aq) + NaOH(aq) = C8H5O4^2-(aq) + Na+(aq) + H2O(l)

moles KHP = moles NaOH
0.1235 g/ 204.22 g = 0.0389 L (M)
M = 0.016 M

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