DATA SHEET 4.3: Standardization of a solution using potassium hydrogen phthalate
ID: 544738 • Letter: D
Question
DATA SHEET 4.3: Standardization of a solution using potassium hydrogen phthalate Trial #3 if necessary) Titration Trial #1 Trial #2 Mass of clean and empty. 999 Erlenmeyer flask 147.210 Mass of Erlenmeyer 130.3640 303 flask with KHP Measured KHP mass 1 0.3556 g | 0.3 95 2 moles | l.UByl0'3wal | 1.814 x10-3 mel Initial buret reading | 48.7 m Final buret reading | 312, | 31% 3 Volume of titrant added 7.6 md 4 Moles of titrant added Calculated molarity sodium hydroxide Average molarity, sodium hydroxideExplanation / Answer
Since this is a titration experiment, so you have to make use of the fact that at the end point, the moles of titrant added equals the moles of titrand taken initially.
For instance, in trial 1, the moles of titrand (KHP) taken is 1.643*10-3. So the moles of titrant added is also equal to 1.643*10-3.
Next, you have to make use of the relation:
Molarity = Moles/Volume
Since you calculated the moles in part (4), and the volume is already calculated in part (3), so using this info you can easily calculate the required molarity in part (5).
Hope this helps !
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