ChemInform Abstract: Confusing Quantitative Descriptions of Broensted-Lowry Acid-Base Equilibria in Chemistry Textbooks - A Critical Review and Clarifications for Chemical Educators

ChemInform ◽  
2014 ◽  
Vol 45 (9) ◽  
pp. no-no
Author(s):  
Erich C. Meister ◽  
Martin Willeke ◽  
Werner Angst ◽  
Antonio Togni ◽  
Peter Walde
Keyword(s):  
Critical Review ◽  
Acid Base ◽  
Chemistry Textbooks

Functionalized magnetic nanosized materials for efficient biodiesel synthesis via acid–base/enzyme catalysis

2020 ◽  
Vol 22 (10) ◽  
pp. 2977-3012 ◽  
Author(s):  
Anping Wang ◽  
Putla Sudarsanam ◽  
Yufei Xu ◽  
Heng Zhang ◽  
Hu Li ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Critical Review ◽  
Enzyme Catalysis ◽  
Heterogeneous Catalysts ◽  
Acid Base ◽  
Preparation Methods ◽  
Performance Control ◽  
Nanosized Materials ◽  
Biodiesel Synthesis ◽  
And Performance

This critical review introduces the preparation methods, structural and performance control, protection, and functionalization of magnetic nanoparticles as easily recyclable and efficient heterogeneous catalysts for biodiesel synthesis.

Acid-Base Theory of Adhesion: A Critical Review

2015 ◽  
Vol 3 (3) ◽  
pp. 253-310 ◽  
Author(s):  
S. Siboni ◽  
C. Della Volpe
Keyword(s):  
Critical Review ◽  
Acid Base ◽  
Base Theory

Confusing Quantitative Descriptions ofBrønstedLowryAcidBase Equilibria in Chemistry Textbooks - A Critical Review and Clarifications for Chemical Educators

2014 ◽  
Vol 97 (1) ◽  
pp. 1-31 ◽  
Author(s):  
Erich C. Meister ◽  
Martin Willeke ◽  
Werner Angst ◽  
Antonio Togni ◽  
Peter Walde
Keyword(s):  
Critical Review ◽  
Chemistry Textbooks

scholarly journals An Analysis of Chemistry Textbooks' and Teachers' Conceptions on Brønsted-Lowry Acid-Base

2017 ◽  
Vol 61 (2) ◽  
pp. 65-76 ◽  
Author(s):  
Sung-Ki Kim ◽  
Chul-Yong Park ◽  
Hee Choi ◽  
Seoung-Hey Paik
Keyword(s):  
Acid Base ◽  
Chemistry Textbooks

scholarly journals THE IMPORTANCE OF TEACHING TITRATION CURVES IN ANALYTICAL CHEMISTRY

2020 ◽  
Vol 17 (34) ◽  
pp. 213-219
Author(s):  
Roberto FERNANDEZ-MAESTRE
Keyword(s):  
Analytical Chemistry ◽  
Acid Base ◽  
Acceptable Error ◽  
Chemistry Teachers ◽  
Chemistry Students ◽  
Undergraduate Chemistry ◽  
Titration Curves ◽  
Chemistry Textbooks ◽  
Ultimate Purpose ◽  
Selection Of

Titration curves are an essential subject of an Analytical Chemistry course. The main objective of calculating titration curves is the selection of an indicator for such titrations. The calculation of titration errors is imperative because they establish if a given indicator can be used for a given titration. This study reviews the available literature on titration curves and calculating their errors. Its purpose is to draw attention to the importance of undergraduate chemistry students having competencies to determine the titration errors rather than skills to build titration curves as the ultimate purpose of these curves is to determine the failure committed when using a given indicator to assess their endpoints. It is shown that the pH and potential calculation at the equivalence point in acid-base and redox titrations, respectively, are not required to choose the titration indicator, one that yields an acceptable error according to the type of application needed. Methods to calculate these errors in the four main types of titrations are presented; those for complexometric and precipitation titrations are simpler than in the literature. Here, it is also demonstrated that calculating points immediately after and before the curve inflection are more critical for this selection in these two types of titrations. Also, it is deducted that complexometric and precipitation curves are not required to select indicators for these titrations. These demonstrations are essential because analytical chemistry teachers may disregard teaching important topics by spending time calculating unnecessary titration curves (complexometric and precipitation titrations) or additional points of titration curves (redox and acid-base titrations) when the calculation of titration errors of these reactions is more critical. Most analytical chemistry textbooks neglect this topic. Undergraduate chemistry programs should focus more on calculating titration errors than on the construction of titration curves.

Semi-synthesis as a tool for broadening the health applications of bioactive olive secoiridoids: a critical review

2021 ◽  
Author(s):  
Manuela Oliverio ◽  
Monica Nardi ◽  
Maria Luisa Di Gioia ◽  
Paola Costanzo ◽  
Sonia Bonacci ◽  
...  
Keyword(s):  
Critical Review ◽  
Natural Compounds ◽  
Effective Strategy ◽  
Synthetic Analogues ◽  
Health Applications ◽  
Natural And Synthetic

Semi-synthesis is an effective strategy to obtain both natural and synthetic analogues of the olive secoiridoids, starting from easy accessible natural compounds.

Higher Dietary Acidity is Associated with Lower Bone Mineral Density in Postmenopausal Iranian Women, Independent of Dietary Calcium Intake

2014 ◽  
Vol 84 (3-4) ◽  
pp. 0206-0217 ◽  
Author(s):  
Seyedeh-Elaheh Shariati-Bafghi ◽  
Elaheh Nosrat-Mirshekarlou ◽  
Mohsen Karamati ◽  
Bahram Rashidkhani
Keyword(s):  
Calcium Intake ◽  
Dietary Calcium ◽  
Dietary Calcium Intake ◽  
Dietary Intakes ◽  
Iranian Women ◽  
Acid Base Balance ◽  
Mineral Density ◽  
Acid Base ◽  
Base Balance ◽  
Dietary Acid

Findings of studies on the link between dietary acid-base balance and bone mass are relatively mixed. We examined the association between dietary acid-base balance and bone mineral density (BMD) in a sample of Iranian women, hypothesizing that a higher dietary acidity would be inversely associated with BMD, even when dietary calcium intake is adequate. In this cross-sectional study, lumbar spine and femoral neck BMDs of 151 postmenopausal women aged 50 - 85 years were measured using dual-energy x-ray absorptiometry. Dietary intakes were assessed using a validated food frequency questionnaire. Renal net acid excretion (RNAE), an estimate of acid-base balance, was then calculated indirectly from the diet using the formulae of Remer (based on dietary intakes of protein, phosphorus, potassium, and magnesium; RNAERemer) and Frassetto (based on dietary intakes of protein and potassium; RNAEFrassetto), and was energy adjusted by the residual method. After adjusting for potential confounders, multivariable adjusted means of the lumbar spine BMD of women in the highest tertiles of RNAERemer and RNAEFrassetto were significantly lower than those in the lowest tertiles (for RNAERemer: mean difference -0.084 g/cm2; P=0.007 and for RNAEFrassetto: mean difference - 0.088 g/cm2; P=0.004). Similar results were observed in a subgroup analysis of subjects with dietary calcium intake of >800 mg/day. In conclusion, a higher RNAE (i. e. more dietary acidity), which is associated with greater intake of acid-generating foods and lower intake of alkali-generating foods, may be involved in deteriorating the bone health of postmenopausal Iranian women, even in the context of adequate dietary calcium intake.

Sign in / Sign up

Export Citation Format

Share Document