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Denaturation of Protein by Strong AcidJohn W. Moore, Jerrold J. Jacobsen, Gary Trammell, Kristin Johnson "Strong acid denatures egg white proteins.This video contains voiceover:""The tertiary structure of egg white proteins is held together by hydrogen bonding and hydrophobic interactions. Adding strong acid to the protein disrupts the intermolecular forces, and the tertiary structure is lost. The loss in protein structure is called denaturation. The proteins precipitate, forming a white solid."""
Extraction of Acid with Base Water and diethyl ether are shaken in a separatory funnel with a small amount of red indophenol. The non-ionic indophenol remains in the ether layer, coloring it red. Addition of sodium hydroxide converts the indophenol to its blue ionic acid anion which is extracted into the water layer turning it blue.
Reactions : AcidBaseRxns (20 Variations) In order to answer the following questions, write the net ionic equation for the reaction between equal volumes of 0.10 M solutions of the following acid and base:
KOH(aq) + HBr(aq)
What are the reaction products? Does the reaction yield an acidic, basic, or neutral aqueous solution?
An Inexpensive Solution CalorimeterEmma Kavanagh, Sam Mindel, Giles Robertson, and D. E. Peter Hughes Describes the construction of a simple solution calorimeter, using a miniature bead thermistor as a temperature-sensing element, that has a response time of a few seconds and made it possible to carry out a thermometric reaction in under a minute. Kavanagh, Emma; Mindel, Sam; Robertson, Giles; Hughes, D. E. Peter. J. Chem. Educ.2008, 85, 1129.
Acids / Bases |
Aqueous Solution Chemistry |
Calorimetry / Thermochemistry |
Laboratory Equipment / Apparatus |
Thermal Analysis |
Thermodynamics
Thermochemical Analysis of Neutralization Reactions: An Introductory Discovery ExperimentKenneth V. Mills and Louise W. Guilmette Describes a guided-inquiry laboratory pedagogy in which students discover chemical concepts in the lab and the instructor uses their pooled data to guide the lecture portion of the course. This method is illustrated by an experiment that reinforces students' understanding of stoichiometry and allows them to discover neutralization reactions and thermochemistry. Mills, Kenneth V.; Guilmette, Louise W. J. Chem. Educ.2007, 84, 326.
Acids / Bases |
Stoichiometry |
Calorimetry / Thermochemistry |
Acids / Bases
Titration of a Solid Acid Monitored By X-Ray DiffractionKeenan E. Dungey and Paul Epstein Presents a solid-state laboratory in which students react fixed amounts of zirconium phosphate with increasing equivalents of NaOH(aq). From X-ray diffraction patterns, students calculate the interplanar spacings before and after the reaction. The spacings increase until the molar equivalence point is reached, indicating incorporation of the sodium ion into the crystal. Dungey, Keenan E.; Epstein, Paul. J. Chem. Educ.2007, 84, 122.
Acids (GCMP)David M. Whisnant Acids: this is a resource in the collection "General Chemistry Multimedia Problems". We will observe the reaction of sodium bicarbonate with three acid solutions. General Chemistry Multimedia Problems ask students questions about experiments they see presented using videos and images. The questions asked apply concepts from different parts of an introductory course, encouraging students to decompartmentalize the material.
Acids / Bases
Acids and Salts (GCMP)David M. Whisnant Acids and Salts: this is a resource in the collection "General Chemistry Multimedia Problems". This problem will explore a few properties of common acids and their salts. General Chemistry Multimedia Problems ask students questions about experiments they see presented using videos and images. The questions asked apply concepts from different parts of an introductory course, encouraging students to decompartmentalize the material.
Acids / Bases
Oxides (GCMP)David M. Whisnant Oxides: this is a resource in the collection "General Chemistry Multimedia Problems". In this problem we will explore the properties of the oxides of a few elements. We will add samples of the oxides to universal indicator solution and learn about the acid-base character of the oxides. General Chemistry Multimedia Problems ask students questions about experiments they see presented using videos and images. The questions asked apply concepts from different parts of an introductory course, encouraging students to decompartmentalize the material.
