18.1.4 – 18.1.6 CALCULATIONS INVOLVING ACIDS AND BASES Review of Important formulas pH = ‐ log10[H+] [H+] = 10‐pH pKa = ‐ log10 Ka Ka = 10‐pKa pOH = ‐ log10[OH‐] [OH‐] = 10‐pOH pKb = ‐ log10 Kb Kb = 10‐pKb The ionic product of water = Kw = [H+] x [OH‐] = 1.0 x 10‐14 mol2 dm‐6 at 298 K The expression varies with temperature
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Commercial Antacid Tablets Hydrochloric acid (HCl) is one of the substances found in gastric juices secreted by the lining of the stomach. HCl is needed by the enzyme pepsin to catalyze the digestion of proteins in the food we eat. Heartburn is a symptom that results when the stomach produces too much acid (hyperacidity). Antacids are bases used to neutralize the acid that causes heartburn. Despite the many commercial brand‚ almost all antacids act on excess stomach acid by neutralizing it with
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STANDARDIATION OF ACID AND BASE Eunice Ivy B. Gamboa ABSTRACT Solutions of known concentration are prepared by dissolving measured masses of standard acids in distilled water. The concentrations of unknown solutions of sodium hydroxide are determined by titration. An acid solution reacts with a base solution in a "neutralization" reaction. Titrations permit the concentrations of unknown acids/bases to be determined with a high degree of accuracy. In order to analyze unknown acids/bases‚ we must have
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Aqueous Acid/Base Chemistry Resources: Harris ‘Quantitative Chemical Analysis’ Review: Pure water has a pH = 7 Autodissociation: H2O (( H3O+ + OH- K = [H3O+][OH-]/[H2O] -log[H3O+] = 7 [H3O+] = 10-7 M = [OH-] [H2O] = 55.56 M K = 1.8 x 10-16 ; pKa = 15.74 pKa is the acid dissociation constant; low pKa (strong acid‚ high pKa (weak acid we can also write Kw = [H3O+][OH-] Kw = 10-14 In water‚ pH + pOH = 14 pH scale Strong
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(Microsoft tablet pc) ------------------------------------------------- History In 2002‚ original equipment manufacturers released the first tablet PCs designed to the Microsoft Tablet PC specification. This generation of Microsoft Tablet PCs were designed to run Windows XP Tablet PC Edition‚ the Tablet PC version of Windows XP.[3] This version of Microsoft Windows superseded Microsoft’s earlier pen computing operating environment‚ Windows for Pen Computing 2.0. After releasing Windows XP Tablet PC Edition
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COMMERCIAL (CENOVIS) TABLET ABSTRACT In this experiment‚ the vitamin C content of a commercial tablet is determined and compared with the manufacturers’ specification. Vitamin C is water-soluble and is an enantiomer of ascorbic acid. (Commercial vitamin C is often a mixture of ascorbic acid and other ascorbates.) Ascorbic acid‚ C6H8O6‚ is a reducing agent that reacts rapidly with iodine (I2). As the iodine is added during the titration‚ the ascorbic acid is oxidized to dehydroascorbic acid‚ while the iodine
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FOM Group Work Educational Tablet Research Psychographic Segmentation Lifestyles: Activities and interests Activities: many students from all over the world as well as educational bodies descend upon the International Consumer Electronics Show(CES) every year to find out what the brand new technology is about to hit the streets. They do this as it enhances the possibilities for what can be made possible for the classroom. There are things such as the Oculus Rift which is a virtual reality headset
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Tablet PCS and the Decline of the Laptop Abstract On September 8‚ 2011‚ Gartner‚ Inc. lowered its forecast for personal computers for the remainder of 2011 and 2012. Based on the recent surge of tablet PCs‚ personal laptops are experiencing a decline as consumers hold onto their laptops longer or replace them completely with tablets. Increased mobility and a need for social media may be two of the forces driving consumers to choose tablets over laptops. This journal seeks to explain the
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Good afternoon everyone‚ im here today to persuade you that tablets are better than textbooks especially in our generation today. But first I must define shortly what is a tablet. A tablet is ... So how tablets surpass the importance and usefulness of textbooks? 1. Tablets help students learn more material faster. Technology-based instruction can reduce the time students take to reach a learning objective by 30-80%. 2. Tablets can hold hundreds of textbooks on one device‚ plus homework‚ quizzes
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Ridder Student number: R0141223 Module: Marketing Fundamentals The tablet market: External analysis of the micro-environment The global tablet PC market continues to grow with shipments reaching 53.8 million units in the third quarter of 2014. The rise in shipment from 48.3 million units in the third quarter of 2013 to 53.8 million units in the third quarter of 2014 can be attributed to the growing demand from costumers as the tablet industry offers the costumer a smaller sized device with a better
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