Calculate the wt% of KHP. I\'ve done the majority of the work but the professor
ID: 967633 • Letter: C
Question
Calculate the wt% of KHP. I've done the majority of the work but the professor stated I was off by a factor of 10. Please show calculations! Original: 1001 uby Purity factor of the primary standard maroon magenta sample weights. 0.41qmg 0.uT1 mg 0.480mg titrant used: M of NaOH: 0851.087 overall "stats": mean .085 median .0Blel RSD 2.39ppt refined "stats": mean- comments: (on back) median RSD-_ppt DETERMINATON OF UNKNOWN KHP SOLUTION .005 Sample “ M of NaOH used Sample 2 sample w3 sample weight: 6887mg Se241 mg 3 a sample weights: 0087 mg 302e mg 3a59 mg titrant used: wt %KHP: overall "stats": mean median RSD ppt refined "stats". mean_ comments: (on back) media-_RSD- ppt density data: wt of 10.0 mL of sol'ng dg/mL Volumetric Molarity of KHP sol'n Gravimetric Molarity of KHP sol'n Central value being reported for grade: larity of KHP so'nM wt% KHPExplanation / Answer
KHP = 204.22 mg/mmol
M of NaOH = 0.0859 M
Sample 1.
Sample Weights = 35887 mg
Titrant Used = 27.00 mL
Solution:
(27.00mL NaOH)(0.0859 M NaOH) = 2.3193 mmol NaOH = 0.0023193 mol KHP
(0.0023193 mol KHP)(204.22 g/mol KHP) = 0.473647446 g KHP = 473.647 mg KHP
%wt KHP = 473.647 mg KHP / 35887 mg Sample
%wt KHP = 0.013198
Sample 2.
Sample Weights = 36261 mg
Titrant Used = 27.40 mL
Solution:
(27.40mL NaOH)(0.0859 M NaOH) = 2.35366 mmol NaOH = 0.00235366 mol KHP
(0.00235366 mol KHP)(204.22 g/mol KHP) = 0.48066445 g KHP = 480.664 mg KHP
%wt KHP = 480.664 mg KHP / 36261 mg Sample
%wt KHP = 0.013256
Sample 3.
Sample Weights = 35259 mg
Titrant Used = 26.95 mL
Solution:
(26.95mL NaOH)(0.0859 M NaOH) = 2.3150 mmol NaOH = 0.0023150 mol KHP
(0.0023150 mol KHP)(204.22 g/mol KHP) = 0.47277032 g KHP = 472.770 mg KHP
%wt KHP = 472.770 mg KHP / 35259 mg Sample
%wt KHP = 0.013409
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.