Accurate automatic titration procedure for low sharpness and dichroism in end point detection using digital movies as detection technique

Siqueira, Lucas A.; Nunes, Iara S.; Almeida, Pedro Lemos de; Lyra, Wellington da Silva; Andrade, Renato Allan Navarro; Araújo, Mário César Ugulino de; Almeida, Luciano F.; Lima, Ricardo Alexandre C.

doi:10.1016/j.microc.2017.04.041

Cited by 17 publications

(2 citation statements)

References 11 publications

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“…3, thereby shifting the neutralization equilibrium nearly entirely to the right in accordance with Le Chatelier's principle and, thus, allowing a university-level weak acid/strong base titration to be conducted with more accessible household materials. 1 By recording the pH as base is added, a titration curve can be created for acetic acid, from which the endpoint of the titration can be calculated by examining the point at which 18 The concentration of acetic acid in the original vinegar analyte solution can be calculated using the concentration and volume of bicarbonate required to reach the endpoint of the titration. 19 This calculated concentration of acetic acid can then be compared to the advertised value, which is approximately 1.0437M, assuming that the density of the acetic acid solution is 1.0446 g/mL at 25 o C. 20 Precision is essential as there are limitations in the accuracy of household instruments.…”

Section: Chemical Theory Of the Acid-base Titrationmentioning

confidence: 99%

Determining the Acetic Acid Concentration in White Vinegar: An At-Home Undergraduate Chemistry Experiment During the COVID-19 Pandemic

Parel

Burnett

Geoffroy

et al. 2021

Preprint

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Due to the COVID-19 pandemic, many university-level chemistry laboratory experiments transitioned online. This created an educational challenge because students are unable to access reagents and instruments typical in a university lab setting. It is also difficult for students to connect theory to practice since real-lab experimentation is not possible in a virtual online for-mat. In our online Introductory Quantitative Analysis Laboratory course (GW Chem 2123W) in spring 2021, students were required to design and perform an experiment that could be safely conducted at home which can also demonstrate key princi-ples of quantitative analysis. Herein, we conducted a reliable at-home experiment that utilizes university-level acid/base titra-tion techniques to determine the acetic acid concentration in white vinegar. The experiment used sodium bicarbonate in the form of baking soda to titrate the Whole Foods white vinegar which is advertised to contain 6% of acetic acid. We reliably obtained an equivalence point for the titration from which the actual concentration of acetic acid in the vinegar was calculated with error analysis to be 19% higher than the advertised value. The analytical techniques demonstrated in this experiment supplement practical knowledge of acid/base techniques learned in the online classroom and prompt adoption of this meth-odology in online laboratory curriculum. This experiment can also be readily applied to measure other acidic solutions such as vinegar and juice for at-home experiment

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Section: Chemical Theory Of the Acid-base Titrationmentioning

confidence: 99%

Determining the Acetic Acid Concentration in White Vinegar: An At-Home Undergraduate Chemistry Experiment During the COVID-19 Pandemic

Parel

Burnett

Geoffroy

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…The majority of endpoint detection methods have been automated except visual methods where automated methods are limited. 12–15 The use of spectrophotometer is a viable option for detecting color endpoints through absorbance measurement. 16,17 Despite its high accuracy and relatively low detection limits, this technique is considered expensive and cumbersome.…”

Section: Introductionmentioning

confidence: 99%