chem lab exp 9 (ii)

chem lab exp 9 (ii) - 3.0 28.6 25.6 0.0465 4 3.0 29.0 26.0...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Purpose: To determine the amount of oxalate in an impure sample through the use of a titration with potassium permanganate, after standardization with pure sodium oxalate. The titration is based on the oxidation- reduction properties of the reactants. Procedure: The experiment procedure is referred to the lab manual for experiment #9: Determination of [KMnO 4 ] by Oxidation-Reduction Titration II. Standardization of the KMnO 4 Solution Approximate molarity of KMnO 4 = 0.04875 mol/L Molarity of Na 2 C 2 O 4 = 0.1498 mol/L Approximate titrant volume of KMnO 4 = 24.6 mL Table I : Standardization of KMnO 4 Solution with 0.002996 moles Na 2 C 2 O 4 Trial Initial mL Final mL mL used [KMnO 4 ] 1 3.0 28.5 25.5 0.0467 2 4.0 29.0 25.0 0.0476 3
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 3.0 28.6 25.6 0.0465 4 3.0 29.0 26.0 0.0458 Average [KMnO 4 ] =0.0466 Standard Deviation [KMnO 4 ] =7.54 x 10^-4 λ at 95% confidence =0.00120 III. Determination of %Na 2 C 2 O 4 in an Unknown Table II: Data for Determination of %Na 2 C 2 O 4 in an Unknown #9/164 Trial Grams of Unknown (g) Initial mL KMnO 4 (aq) Final mL KMnO 4 (aq) Used mL KMnO 4 (aq) Grams of Na 2 C 2 O 4 (g) Weight % Na 2 C 2 O 4 1 0.505 6.45 35.90 29.45 0.4596 91.0% 2 0.502 5.60 34.95 29.35 0.4580 91.2% 3 0.505 2.95 33.45 29.50 0.4604 91.1% 4 0.501 5.75 35.50 29.75 0.4643 92.7% Average wt% Na 2 C 2 O 4 = 91.5% Standard Deviation [KMnO 4 ] = 0.804 λ at 95% confidence = 1.279...
View Full Document

{[ snackBarMessage ]}

Page1 / 2

chem lab exp 9 (ii) - 3.0 28.6 25.6 0.0465 4 3.0 29.0 26.0...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online