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FALL 2022 CHEM25415: INSTRUMENTAL ANALYSIS 1LAB REPORT COVER SHEET
Name: Lovedeep Kaur Lab Day and Time: Tuesday and 11 am to 1 pm
Lab Partner: Sonia Rahul Professor: Varvara Pokrovskaya
Experiment Title: Quantitative analysis of calcium in vitamins by standard addition method using AAS
Date Performed: 08-11-2022 Date Submitted: 08-12-2022
Unknown Sample #: CAV #116 Unknown Identity: Life brand spectrum men’s
STATISTICS Mean Final Result Relative Standard True Value @ 95%
Deviation Confidence Interval
Multipoint Method
18% 292.14 mg ± 467.20 mg
292.14 grams
Single Point Method 272.54 grams
25% 272.54 mg ± 609.96 mg
Report Evaluation Summary
A. Lab Report Questions (answers to all questions in Lab Report outline)
B. General Format /6
C. Spelling/Grammar/Clarity of Comments /2
C. Significant Figures and Units /5
D. References (ACS format) /2
E. Accuracy/Unknown Identity and Precision
F. Raw Data (notebook) and Instrumental Output (Grade of zero if missing)
G. Late penalty (10% deduction per day, up to a maximum of 5 days)
# of days late:______ Deduction: 10% 20% 30% 40% 50%
Total Lab Report Mark
Improper Formatting: ______________________________ Incorrect Calculations: ___________________________
Improper Referencing: _____________________ Incomplete/Incorrect Discussion: __________________________
ADDITIONAL COMMENTS:__________________________________________________________________________
_________________________________________________________________________________________________
,Table of Contents
Lab Partner: Sonia Rahul Professor: Varvara Pokrovskaya....................................................................................................1
Experiment Title: Quantitative analysis of calcium in vitamins by standard addition method using AAS.............................1
Laboratory Report Questions................................................................................................................................................1
Quantitative analysis of calcium in vitamins by standard addition method using AAS 08-12-2022......................................1
A – Operating Parameters and Standard Addition Solution Concentrations.........................................................................1
1............................................................................................................................................................................................ 1
(a).......................................................................................................................................................................................... 1
.............................................................................................................................................................................................. 1
5............................................................................................................................................................................................ 3
B – Standard Addition Multipoint Method............................................................................................................................4
6............................................................................................................................................................................................ 4
8............................................................................................................................................................................................ 5
9............................................................................................................................................................................................ 6
C – Standard Addition Single Point Method..........................................................................................................................7
11.......................................................................................................................................................................................... 7
D – Results Summary and Unknown Identification...............................................................................................................9
13.......................................................................................................................................................................................... 9
14......................................................................................................................................................................................... 9
15........................................................................................................................................................................................ 10
E – Discussion...................................................................................................................................................................... 10
16........................................................................................................................................................................................ 10
17........................................................................................................................................................................................ 10
(a) ....................................................................................................................................................................................... 10
(b)........................................................................................................................................................................................ 10
18........................................................................................................................................................................................ 11
References:.......................................................................................................................................................................... 11
Laboratory Report Questions................................................................................................................................................1
A – Operating Parameters and Standard Addition Solution Concentrations.........................................................................1
1............................................................................................................................................................................................ 1
(a).......................................................................................................................................................................................... 1
(b).......................................................................................................................................................................................... 1
2............................................................................................................................................................................................ 1
3............................................................................................................................................................................................ 1
4............................................................................................................................................................................................ 2
, 5............................................................................................................................................................................................ 3
B – Standard Addition Multipoint Method............................................................................................................................4
6............................................................................................................................................................................................ 4
7............................................................................................................................................................................................ 4
8............................................................................................................................................................................................ 5
9............................................................................................................................................................................................ 6
C – Standard Addition Single Point Method..........................................................................................................................7
10.......................................................................................................................................................................................... 7
11.......................................................................................................................................................................................... 7
12.......................................................................................................................................................................................... 8
D – Results Summary and Unknown Identification...............................................................................................................9
13.......................................................................................................................................................................................... 9
14.......................................................................................................................................................................................... 9
15.......................................................................................................................................................................................... 9
E – Discussion...................................................................................................................................................................... 10
16........................................................................................................................................................................................ 10
17........................................................................................................................................................................................ 10
(a)........................................................................................................................................................................................ 10
(b)........................................................................................................................................................................................ 10
18........................................................................................................................................................................................ 10
References:......................................................................................................................................................................... 11
Table 1: AAS spectrometer instrumental settings................................................................................................................1
Table 2: Concentrations and Absorbance Values for Ca2+...................................................................................................2
Table 3: mass of vitamin weighed, slope value and correlation coefficient values...............................................................4
Table 4: mass (mg) of Ca2+ in the original vitamin tablet sample.........................................................................................5
Table 5: mass of Ca2+ per average vitamin tablet (mg/average tablet)...............................................................................6
Table 6: mean mass of Ca2+ per average vitamin tablet (mg/average tablet),absolute standard deviation, relative
standard deviation and true value (μ) at 95%.......................................................................................................................7
Table 7: concentration of Ca2+ in each diluted vitamin tablet sample.................................................................................7
Table 8: mass of Ca 2+ per average vitamin tablet (mg/average tablet)..............................................................................8
Table 9: mean mass of Ca2+ per average vitamin tablet (mg/average tablet), absolute standard deviation, relative
standard deviation and true value at 95% confidence interval for unknown sample...........................................................9
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