Matching Five White Solids to Common Chemicals: A Dissolution Calorimetry and Acid–Base Titration Experiment

Bhukdee, Dhup; Limpanuparb, Taweetham

doi:10.1021/acs.jchemed.0c00291

Cited by 4 publications

(4 citation statements)

References 49 publications

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“…Also note that ChemToy2 “is afraid of the dark”; that is, reactions in tubes 4–5 are photochemical and require light to proceed. There is no need to disclose the chemical composition of ChemToy2 to students for this to be a valuable experience; others have reported similarly. , Yet, if students know in advance that they will be observing nanochemistry, this knowledge could be a key to their understanding and performance during the observation period. Also, students should be cautioned not to attempt to open the tubes; however, the plugs fit so tightly that most students cannot remove them.…”

Section: Methodsmentioning

confidence: 99%

Nanochemical Activity for Undergraduates with ChemToy2

2021

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Nanochemistry is an important aspect of modern chemical science. Though few educational institutions teach nanochemistry as a formal course, general exposure of students to nanoscience is yet important. Thus, we present a nanochemical activity that could be used as part of many chemistry courses or laboratories based on ChemToy2. This activity is judged to be fun and enjoyable by students and is conducted over a one-week observation period. During this time, gold and silver nanochemistry results in 45 fundamental states or changes in the five observed solutions. Possible observations include a myriad of colors centered on purples and greens, photochemistry, the common states of matter, the Tyndall effect, surface-wetting phenomena, detergent action, gradients, and discontinuity. Each student’s power of observation can be scored at the end of the observation period, and discussions and further activities based upon their findings can proceed. We provide nanochemical results on ChemToy2 to support these activities; data include localized surface plasmon resonance (LSPR), optical light scattering, dynamic light scattering (DLS), nanoparticle-synthesis growth maps, and results of testing by 114 undergraduate students.

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Section: Methodsmentioning

confidence: 99%

Nanochemical Activity for Undergraduates with ChemToy2

2021

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“…In these case a phenolphthalein indicator is adding to the analyte concentration. Literature survey reveals about indicators as phenolphthalein and methyl orange [3], that is used as acid-base indicators in titration [4,5], and in variety of reactions at pH dependence well [6][7][8]. In this article, we have been reported the study of phenolphthalein indicator behaviour in titrimetric estimation of the solubility of benzoic acid with its distribution in water and benzene buffer solutions.…”

Section: (Deep Red Colour)mentioning

confidence: 99%

Phenolphthalein Indicator in Titrimetric Estimation of Benzoic Acid Solubility and Distribution in Water and Benzene-Buffer Solutions

Mishra

2022

AJOCS

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In solubility and partitioning process of benzoic acid, the various factors are involved such as temperature, solute-solvent interaction and dissociation of acid into ionic state in taking solvents. Here, we reported the benzoic acid (solute) solubility in gram/100gram of solvent in different pH benzene-buffer solutions which are analyzed by using of titration method and partition study of these acid into solvents like water and benzene layer by shake-flask acid-base titration method, at room temperature (25°C) for 24 hours. In titrimetric estimation the solute benzoic acid solubility and their partition in between of water and in different pH buffer solutions as in medium of acidic, neutral and basic, a phenolphthalein indicator have been used well. The solvents and benzene-buffer solutions having different pH 4.0, 7.0 and 9.0 is titrated against as 0.01, 0.05 and 0.1N NaOH solutions by using phenolphthalein as indicator, where the end point show a pink color for each reading. Concentration of benzoic acid into water and solvent benzene layers is being calculated as by applying the equation of normality determination and distribution coefficient as from Nernst distribution law equation.

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“…Titration aids in precise determination of unknown concentrations of identified analytes . In the laboratory, several types of titrations with different procedures and goals may be used. − Acid–base titrations are commonly used volumetric analysis techniques in laboratories of secondary and postsecondary educational institutions. − …”

Section: Introductionmentioning

confidence: 99%

Visualization and Quantification of Sodium Chloride Formed during the Titration of Hydrochloric Acid with Sodium Hydroxide: An Extension to the Learning Outcomes During Acid–Base Titrations

Khursheed,

Hussain,

Gul

et al. 2024

J. Chem. Educ.

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Titration is an important experimental skill that every chemistry educator and learner must master. Titration is often the method of choice in the science laboratory courses in secondary and postsecondary schools. During acid−base titration, chemistry learners are always told about salt formation. However, a practical visualization of the salt formed is not actually done. The evasion from the visualization of salt formed in acid−base titrations may prevent students from learning some key concepts of isolation, purification, quantification, and identification of salts. In view of the importance of titrations and salt formation therein, we demonstrate the titration of sodium hydroxide with hydrochloric acid with special focus on the visualization of the formation, isolation, purification, and identification of sodium chloride formed during the titration. The identification of sodium chloride was done by solubility studies and silver nitrate and flame tests. The approach serves as a unique and effective pedagogical method for understanding acid− base titrations and formation, isolation, purification, quantification, and identification of salts formed during acid−base neutralization reactions.

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Matching Five White Solids to Common Chemicals: A Dissolution Calorimetry and Acid–Base Titration Experiment

Cited by 4 publications

References 49 publications

Nanochemical Activity for Undergraduates with ChemToy2

Nanochemical Activity for Undergraduates with ChemToy2

Phenolphthalein Indicator in Titrimetric Estimation of Benzoic Acid Solubility and Distribution in Water and Benzene-Buffer Solutions

Visualization and Quantification of Sodium Chloride Formed during the Titration of Hydrochloric Acid with Sodium Hydroxide: An Extension to the Learning Outcomes During Acid–Base Titrations

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