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Determining the Acetic Acid Concentration in White Vinegar: An At-Home Undergraduate Chemistry Experiment During the COVID-19 Pandemic
ChemRxiv Pub Date : 2021-06-28 , DOI: 10.33774/chemrxiv-2021-hxb4r
Ling Hao 1 , Philip Parel 1 , Lydia Burnett 1 , Morgan Geoffroy 1 , John Parel 2
Affiliation  

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

中文翻译:

测定白醋中的乙酸浓度:COVID-19 大流行期间的家庭本科化学实验

由于 COVID-19 大流行,许多大学级化学实验室实验转为在线进行。这带来了教育挑战,因为学生无法获得大学实验室环境中常见的试剂和仪器。学生也很难将理论与实践联系起来,因为在虚拟在线格式中不可能进行真实的实验室实验。在我们 2021 年春季的在线定量分析实验室入门课程 (GW Chem 2123W) 中,学生需要设计和执行一个可以在家中安全进行的实验,该实验还可以展示定量分析的关键原理。在此,我们进行了一项可靠的家庭实验,该实验利用大学水平的酸/碱滴定技术来确定白醋中的醋酸浓度。该实验使用小苏打形式的碳酸氢钠滴定全食白醋,该白醋标榜含有 6% 的醋酸。我们可靠地获得了滴定的等当点,通过误差分析计算出醋中乙酸的实际浓度比广告值高 19%。本实验中展示的分析技术补充了在线课堂中学到的酸/碱技术的实践知识,并迅速在在线实验室课程中采用了这种方法。该实验也可以很容易地应用于测量其他酸性溶液,例如醋和果汁,用于家庭实验 我们可靠地获得了滴定的等当点,通过误差分析计算出醋中乙酸的实际浓度比广告值高 19%。本实验中展示的分析技术补充了在线课堂中学到的酸/碱技术的实践知识,并迅速在在线实验室课程中采用了这种方法。该实验也可以很容易地应用于测量其他酸性溶液,例如醋和果汁,用于家庭实验 我们可靠地获得了滴定的等当点,通过误差分析计算出醋中乙酸的实际浓度比广告值高 19%。本实验中展示的分析技术补充了在线课堂中学到的酸/碱技术的实践知识,并迅速在在线实验室课程中采用了这种方法。该实验也可以很容易地应用于测量其他酸性溶液,例如醋和果汁,用于家庭实验 本实验中展示的分析技术补充了在线课堂中学到的酸/碱技术的实践知识,并迅速在在线实验室课程中采用了这种方法。这个实验也可以很容易地应用于测量其他酸性溶液,如家庭实验的醋和果汁 本实验中展示的分析技术补充了在线课堂中学到的酸/碱技术的实践知识,并迅速在在线实验室课程中采用了这种方法。该实验也可以很容易地应用于测量其他酸性溶液,例如醋和果汁,用于家庭实验
更新日期:2021-06-28
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