Worksheet - Acids‚ Bases and Salts 1. I am pure water. When heated my pH (increases‚ decreases)‚ because more of my water molecules dissociate. 2. I am a 0.020 M solution of weak acid‚ HA. If I only dissociate to the extent of 1.50%‚ what is the value of my Ka? 3. I am a 0.20 M solution of hydrocyanic acid‚ HCN‚ with a Ka of 4.93 x 10¯ 10 . What is my pH? 4. I am a buffer made from 0.10 M acetic acid and 0.15 M sodium acetate. If the Ka for acetic acid is 1.77 x 10¯ 5 ‚ what is my pH? 5. I am
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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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BASE ISOLATED BUILDINGS What is base isolation? When a building is built away (isolated) from the ground‚ resting on flexible bearings or pads known as base isolators. It is of the most popular means of protecting a structure against earthquake forces. HISTORY The first evidence of architects using the principle of base isolation for earthquake protection was discovered in Pasargadae. One of the world’s first base-isolated structures – the William Clayton building Base Isolation
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Title: ACID BASE TITRATION. Objectives: 1. To determine the concentration of acid using titration. 2. Skills of titration techniques. Apparatus: 1. 250 volumetric flask 2. 10mL measuring cylinder 3. 25mL pipette 4. 50mL burette 5. 250mL beaker 6. 150mL conical flask 7. Retord stand 8. White tile 9. Stopwatch 10. Pipette bulb Chemicals: 1. HCl solution 2. 0.1M NaOH solution 3. H2SO4 solution 4. Distilled water 5. phenolphthalein Introduction
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Four bases of segmentation Geographic Collecting and analysing information according to the location of the customer or other data source. Geographic segmentation is often used in marketing‚ since companies selling products and services would like to know where their products are being sold in order to increase advertising and sales efforts there. A local shop such as a local takeaway use geographic segmentation by targeting customers within a 10 mile radius‚ they can do this by posting leaflets
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The Base Ball Pitch - Tom Hando The biomechanics of a movement is slightly different to the physiological principles of it. The biomechanics of a movement‚ is how the forces acting upon an object effects the way the object moves. (FIGURE 1) For example in my movement‚ the baseball pitch‚ in the wind up stage of the pitch‚ the forces acting upon the body is causing hip and knee flexion which results in the knee and hip coming into contact with the chest. Whereas the physiological principles is working
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Acid-Base Calculations The Ion-Product Constant for Water‚ Kw Water undergoes ionization to a small extent: H20(l) H+(aq) + OH–(aq) The equilibrium constant for the reaction is the ion-product constant for water Kw: (1) This is a key equation in acid-base chemistry. Note that the product of [H+] and [OH–] is a constant at a given temperature (Eq(1) value is for 25oC). Thus as the hydrogen ion concentration of a solution increases‚ the hydroxide ion concentration decreases
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Etiquette Knowledge Base : Table Manners & Dining Etiquette Q. Is it considered rude to take a sip of your drink while still chewing? A. It is considered good manners to wait until you have finished chewing and have swallowed your food before taking a sip of your beverage. Q. What is the correct position for a coffee cup in a formal place setting? A. The coffee cup and saucer is placed to the right of the place setting‚ to the right of the furthest utensil. Since most people are right-handed
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hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh Case- Harrah’s Entertainment Inc. Questions: 1. What are the objectives of the various Data Base marketing programs and are they working? 2. Why is it important to use the “customer worth” in the DBM efforts rather than observed level of play? 3. How does Harrah’s integrate the various elements of its marketing strategy to deliver more than the results of Data Base marketing? 4. What is the sustainability of Harrah’s actions and strategy? 5. What are the privacy and ethical
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concepts as well as possess knowledge of how children learn early number concepts. Place value is the idea that each digit in a number represents a certain amount‚ depending on the position that it occupies. Recognizing that children can count out a set by ones‚ as a future educator it’s important to help them see that groupings of tens and leftovers is a way of counting that same quantity. Counting plays a role in constructing base-ten ideas about quantity. Each approach helps children think about the
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