A sample of potassium hydrogen phthalate (KHC8H4O4), which is an acid, with a mass of 0.7292...

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A sample of potassium hydrogen phthalate (KHC8H4O4), which is anacid, with a mass of 0.7292 g is dissolved in water and used tostandardize a solution of cesium hydroxide. An endpoint is reachedwhen 34.61 mL of cesium hydroxide has been added. Determine themolarity (in mol/L) of the cesium hydroxide solution. Report youranswer to four significant figures.

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4.3 Ratings (862 Votes)

the reaction taking place is:
KHP + CsOH ==> H2O + CsK2P2

molar mass of KHC8H4O4 = 204.44 g/mol
number of moles of KHC8H4O4 = mass / molar mass
Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 0.7292/204.44
Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 3.567 *10^-3 mol

number of moles of CsOH should equal number of moles of KHC8H4O4
number of moles of CsOH = 3.567 *10^-3 mol
number of moles of CsOH = 3.567 *10^-3
M*V = 3.567 *10^-3
M*0.03461 L = 3.567 *10^-3
M= 0.1031 M
Answer: 0.1031 M

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