... as acid-base interactions comes from the wide acceptance of the Lewis definition of acids and bases, which supplanted both the earlier Bronsted-Lowry concept and the first definition--the Arrhenius model. Arrhenius first defined acids as proton (H) producers in aqueous solution and bases as hydroxide (OH) producers. Although this model is intuitively correct, it is limited to substances that ... include proton and hydroxide groups. Lewis gave us the more general definition of acids and bases that we use today. According to Lewis, acids are electron pair acceptors and bases are electron ....

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• Grade Level: High School

... chain of atoms such as in polyacetylene. Assume a row of N atoms separated by a distance d, so the total length of the chain is (N-1)d or, for large N, approximately Nd. According to the quantum-mechanical model for a free particle in a onedimensional box (potential zero inside the box and infinity outside) the wave functions (Figure 6) correspond to a ladder of eigenvalues En ... 1,2, 3 , (4) where h is Planck's constant, m the electron mass and n a quantum number. If we assume that the electrons from the N p-orbitals are filled into this ladder, with two electrons per molecular orbit...

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Arrhenius acids and bases make up a class of compounds, which include many of many of our most common compounds and laboratory reagents. Acids are substances that reacts with water to produce ... a weak acid or base is to conduct a titration with a base or acid with a known molar concentration. This will help determine the equilibrium constant, Ka, for the weak acid or base. According to the Henderson-Hasselbalch equation, pH = pKa + log [base/acid] If there are equal moles of weak acid and the base, NaOH at the half-equivalency point during this lab ... in dynamic equilibrium is subjected ...

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• Grade Level: High School