edges and carving details become rounded‚ gradually. Black crust forms on sheltered buildings and monuments. A classic buffer is a combination of a weak acid and its conjugate salt; for instance‚ carbonic acid (H2CO3) and sodium bicarbonate (NaHCO3)‚ or even sodium bicarbonate and calcium carbonate. In any buffer system‚ the boost in [H+] increases the reaction rate H+ + salt => weak acid and takes some H+ out of circulation. As it does so‚ it increases weak acid concentration‚ so the reverse
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Interpretation of the Arterial Blood Gas Self-Learning Packet 2004 This self-learning packet is approved for 2 contact hours for the following professionals: 1. Registered Nurse 2. Licensed Practical Nurse Orlando Regional Healthcare‚ Education & Development Copyright 2004 Arterial Blood Gas Interpretation Table of Contents Purpose ................................................................................................................... 3 Objectives ...........
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solution? 6. What is the purpose of using CaCl2 pellets? (More questions next page!) 7. a) If your carboxylic acid is benzoic acid‚ how many moles of benzoic acid are present in your sample? b) How many moles of sodium
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Seung Soo (Jason) Lee 002213-065 Internal Assessment – Investigating the Relationship between Concentration of Sodium Chloride and the Rate of Reaction of Enzyme Amylase Research Question: How will changing the percentage of sodium chloride concentration affect the rate of reaction of enzyme amylase‚ measured using the absorbance of starch and iodine with a spectrophotometer. Introduction: Amylase is an enzyme that is involved in the human digestive process. Found in both the human pancreas
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portion of a person’s body weight is contributed by: a. water b. fat c. bone d. muscle 3. Which of the following electrolytes are anions? (select all that apply) a. sodium b. calcium c. chloride d. bicarbonate 4. The movement of water across a membrane from a less concentrated solution to a more concentrated solution defines: a. diffusion b. osmosis c. filtration d. active transport
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developed to "soften" hard water; i.e.‚ remove the calcium and magnesium ions. Water can be softened in a number of ways. An automatic water softener connected to water supply pipes removes magnesium and calcium from water and replaces them with sodium. Sodium does not react with soap or detergents. If you don’t have an automatic water softener‚ you can still soften laundry water by adding softeners directly to the wash water. These softeners combine with calcium and magnesium‚ preventing the minerals
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reactants and products of the reaction‚ to determine the actual yield vs theoretical yield‚ and to accurately calculate percent yield. The mass of the weighing dish was .6 grams and the mass of the weighing dish plus the sodium carbonate was .72 grams thus the mass of the sodium carbonate alone was .12 grams. After the precipitation reaction the mass of the filter paper and calcium carbonate was 1.8 grams and the calcium carbonate was .8 grams. Through this experiment we used a precipitation reaction
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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 weak bases. The most common of these bases are hydroxides‚ carbonates‚ or bicarbonates. The following table contains a list of the active ingredients found in several common commercial antacids‚ and the reactions by which these antacids neutralize the HCl in stomach acid. Compound Chemical Formula Chemical Reaction Aluminum hydroxide
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(vi)Double decomposition reaction (reaction between sodium sulphate and barium chloride) APPARATUS REQUIRED: 1. A rack of at least six clean test tubes and a boiling tube (hard glass test tube) 2. Two 100 cc beakers 3. A test tube holder CHEMICALS REQUIRED: 1. Small pieces of quicklime (CaO) in crystal form and not in powder form 2. Ferrous sulphate crystals 3. Copper sulphate solution 4. Iron filings 5. Sodium sulphate solution 6. Barium chloride solution 7
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to “rise”. When a weak acid such as vinegar‚ or buttermilk‚ or lemon juice is added to the baking soda‚ bubbles of carbon dioxide are produced. For example HC2H3O2 + NaHCO3 → H2O + CO2 + NaC2H3O2 Vinegar sodium sodium Bicarbonate acetate This release of gas is what causes the cake to increase in size. However‚ because baking soda tastes bitter and acids taste sour‚ it is important to add them close to their reacting ratio so they will neutralize each other
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