Potentiometric Determination of Zinc in Supplement Tablets Using a Ca-Ion Selective Electrode

Samayoa-Oviedo, Hugo Y.; Halpern, Emily R.; Mehnert, Samantha A.; Laskin, Julia

doi:10.1021/acs.jchemed.2c00154

Cited by 6 publications

(7 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The solution pH was determined using the Smart Indicator Reader app, while simultaneously, the same titration was performed in the absence of the Universal Indicator, but using the Vernier pH meter. Each group collected a minimum of 12 data points at different increments of NaOH addition (0, 4,8,10,11,12,13,14,15,16,17, and 18 mL) and used the collected results to plot a titration curve (pH vs volume of NaOH added for both methods; Figure 4). These titration curves were subsequently compared with the data from the pH meter and Smart Indicator Reader in order to improve the app calibration if needed.…”

Section: Using the Smart Indicator Reader For Acid/base Titration Usi...mentioning

confidence: 99%

See 1 more Smart Citation

Mobile App to Quantify pH Strips and Monitor Titrations: Smartphone-Aided Chemical Education and Classroom Demonstrations

Li,

O’Neill,

Pattison

et al. 2023

J. Chem. Educ.

View full text Add to dashboard Cite

pH determination and acid−base titrations are essential experiments performed by high school and university undergraduate students alike throughout their chemistry education. While these experiments often rely on conventional pH meters for quantification and pH test strips or indicators for qualitative assessments, we demonstrated herein that a smartphone-based pH determination technique, performing digital image analysis, particularly the determination of either the dominant wavelength or the RGB intensities, could readily replace all but one conventional pH meter in a classroom setting. Using an in-house developed smartphone-based pH reading application (app), students were able to determine the pH and perform titrations using pH strips and universal indicators, producing results matching those determined with a standard pH meter. The app and its "variants" are available for download (https://tinyurl.com/2dashjyk and https://tinyurl.com/4d73wnxt), and no prior knowledge of coding or programing was required from the students. All that was needed was an Android 11 phone or tablet with an Internet connection. Moreover, the students and instructors' reactions to the mobile app alike were very positive and showcased the need and interest for such inexpensive technology, which allows for the running of an entire class for pH determination of multiple real-life samples or acid/base titration without using standard pH meters.

show abstract

Section: Using the Smart Indicator Reader For Acid/base Titration Usi...mentioning

confidence: 99%

“…However, this approach requires sourcing materials and devoting time to building the apparatus. More recently, app based approaches to titrations and spectroscopies have received an extensive amount of attention and are becoming ubiquitous in chemistry teaching laboratories. − …”

mentioning

confidence: 99%

Mobile App to Quantify pH Strips and Monitor Titrations: Smartphone-Aided Chemical Education and Classroom Demonstrations

Li,

O’Neill,

Pattison

et al. 2023

J. Chem. Educ.

View full text Add to dashboard Cite

show abstract

“…19−23 Among them, titration, as a fundamental experimental project, is very effective in improving students' skills in precise measurement, observation, and data analysis. 24 Therefore, it is very suitable for beginners to cultivate patience and practice basic laboratory skills. Moreover, the rise of short video apps, such as TikTok and WeChat, has assisted in the teaching of laboratory skills.…”

Section: ■ Introductionmentioning

confidence: 99%

The Laboratory Skills Contest: An Activity to Improve and Evaluate Students’ Laboratory Practice through the Determination of Water Hardness

Wang,

Zhou,

et al. 2024

J. Chem. Educ.

View full text Add to dashboard Cite

By hosting a college students' laboratory skills contest, we provide an interesting activity for students to cultivate good laboratory practices and thereby improve their laboratory skills. The substance of this contest is the detection of the hardness of water, which involves numerous laboratory skills such as solution preparation, weight by difference mass measurements, glassware calibration, pipetting, quantitative transfer, titration, data processing, and cleaning up the laboratory. Initially, due to limited class time, students are unable to master and practice effectively the skills taught in class. Many students wanted to practice these skills at a time after class, and these skills were subsequently redesigned and organized as an extracurricular activity to involve more students. Skills are assigned to students depending on their year: freshmen act as lab assistants to prepare solutions, such as EDTA-2Na, hydrochloric acid, ammonia, and indicators. This is a simple skill that aims to build confidence in mastering chemical experiments, as such experiments are rarely conducted in high school. Sophomores conducted experiments as contestants. Through the contest, students' laboratory skills are improved and evaluated. The task for senior students is to provide guidance to freshmen and sophomores, identify their mistakes, and demonstrate the correct operations. All of the students collaborated to complete this activity.

show abstract

“…Usually, hands-on activities for teaching direct and indirect potentiometry are limited to using an ion-selective electrode, usually a pH meter. − However, these instruments become “black boxes” that do not depict the main concepts and components of a potentiometric assembly. Assays and experiments involving self-made equipment and newly accessible technology give students an opportunity for a better understanding of such complicated topics and encourage their interest. , …”

Section: Introductionmentioning

confidence: 99%

Jelly Potentiometry, Do It Yourself

et al. 2023

View full text Add to dashboard Cite

Understanding potentiometry is a difficult task when students in initial courses of Analytical Chemistry are first introduced to instrumental techniques. The closest instrument to them is a pH meter, which is frequently used as a “black box”, without a real understanding of how it works. Here we present the assembly of jelly modules that the students can combine in different ways with the purpose of visualizing what reference and indicator electrodes are and their function when they are used in potentiometric measurements with quantitative purposes. This didactic sequence was used during six semesters in a first course of Analytical Chemistry dictated for students becoming laboratory technicians in Chemistry and Chemical Engineering. It is a hands-on experiment to exemplify both a direct potentiometric analysis and a potentiometric titration (indirect analysis). It is simple, low-cost, and easy to apply. It only requires gelatin, salts, pieces of metal, and a multimeter. The students showed interest in its execution, and they were able to identify the functions of the electrodes, discuss the different analytical implications of potentiometric techniques among themselves, and make the requested graphics with very good results.

show abstract

Potentiometric Determination of Zinc in Supplement Tablets Using a Ca-Ion Selective Electrode

Cited by 6 publications

References 20 publications

Mobile App to Quantify pH Strips and Monitor Titrations: Smartphone-Aided Chemical Education and Classroom Demonstrations

Mobile App to Quantify pH Strips and Monitor Titrations: Smartphone-Aided Chemical Education and Classroom Demonstrations

The Laboratory Skills Contest: An Activity to Improve and Evaluate Students’ Laboratory Practice through the Determination of Water Hardness

Jelly Potentiometry, Do It Yourself

Contact Info

Product

Resources

About