Homework Answers
Ans:
KHP = Potassium hydrogen phthalate (monoprotic acid)
Mass of KHP taken = 0.445 g
Molar mass of KHP = 204.42 g·mol−1
No. of millimoles of KHP taken,n = (0.445/204.42) x 1000 = 2.17689 mmol
Volume of water/solution taken, V1 = 20.0 mL (ignored the volume change due to the addition of KHP)
Molarity of KHP = n/V1 = 2.17689mmol/20.0mL = 0.10884 M (M1)
Initial burette reading = 1.88 mL
End point burette reading = 28.66 mL
Volume of NaOH added = (28.66-1.88) = 26.78 mL (V2)
Molarity of NaOH (monoacidic base, M2 = ?
For an acid base titration involving monoprotic acid and monoacidic base, we have
M1.V1 = M2.V2
0.10884 M x 20.0 mL = M2 x 26.78 mL
M2 = 0.0813 M
Concentration of NaOH solution, M2 = 0.0813 M
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