What mass of chlorine was present in the sample? A. 0.127 g B. 0.355 g C. 0.994 g D. 1.01 g Question 10 (2009) The level of carbon dioxide in the air in a spacecraft can be controlled by passing the air through canisters containing lithium hydroxide‚ LiOH. In a laboratory trial‚ the air in a 5.00 L container at 1.10 × 102 kPa and 25.0°C was passed through a canister of LiOH. The pressure of the air in the container decreased to 1.00 × 102 kPa‚ measured at 25.0°C. The mass of CO2 absorbed from
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From Wikipedia‚ the free encyclopedia Jump to: navigation‚ search For other uses‚ see Soap (disambiguation). [pic] [pic] A collection of decorative soaps‚ often found in hotels [pic] [pic] Two equivalent images of the chemical structure of sodium stearate‚ a typical soap. In chemistry‚ soap is a salt of a fatty acid.[1] Soaps are mainly used as surfactants for washing‚ bathing‚ and cleaning‚ but they are also used in textile spinning and are important components of lubricants. Soaps for cleansing
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determination. Experiment Scheme6 Figure 1. Reaction equation.6 A hot water bath was prepared in a fume hood using a 250-mL beaker. 2.5 g of p-acetamidobenzenesulfonyl chloride was placed into a 50 mL Erlenmeyer flask and 11 mL of dilute ammonium hydroxide solution was added to it. The mixture was stirred with a glass stirring rod. The mixture was heated in the hot water bath (70C) for 10 minutes and stirred occasionally. The flask was allowed to cool and placed in an ice water bath for 15 minutes
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started every 5 seconds‚ we would record how much oxygen was produced for 30 seconds. We repeated that process for two trials For the third experimental group we altered the pH of the catalase solution from a pH of 6 to a pH of 8 by adding 1 M of Sodium Hydroxide to the solution. To make sure it was a pH that was needed‚ we used a pH test strip. We added 40 ml of 1% Hydrogen Peroxide and altered catalase
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feeling on contact with skin. Bases readily accept hydrogen ions and has a pH level that is higher the 7. Bases have a bitter taste and neutralise d by acids‚ producing water and a salt. Some common laboratory bases are Sodium Hydroxide‚ Potassium Hydroxide and Calcium Hydroxide. Stronger bases are commonly used today in many cleaning products. Indicators help us find wether if a chemical is an acid or base. The scale that is used to find wether a chemical is an acid or a base is the pH scale
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citric acid (HC6H8O7) and phosphoric acid (H3PO4). B. Objectives At the end of this exercise‚ you must be able to: Prepare and standardize a solution of Sodium hydroxide solution Determine the acidity of the two soft drink samples using the standardized solution Perform the right titration techniques II. Materials A. Reagents Sodium hydroxide (NaOH) pellets Potassium acid phthalate (HKC8H4O4) Phenolphthalein Soft drinks samples B. Apparatus 250-ml beaker 250-ml Erlenmeyer flask 100-ml volumetric
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CHEM161 Experiment 7: Calorimetry Introduction Calorimetry is the science of measuring heat flow‚ and heat is defined as thermal energy flowing from an object at a higher temperature to one at a lower temperature. For example‚ if a chunk of metal at room temperature is placed in a beaker of boiling water‚ the metal will absorb heat from the water until it is at the same temperature as the boiling water. Scientists also often study the heat associated with different physical and chemical changes
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In the majority field of chemical processes‚ the reactor vessel in which the reaction process take place is the key component of the equipment.The design of the reactors is very important to the success of the production. In this experiment‚ sodium hydroxide and ethyl acetate react in tubular flow reactor.Both of the reactants fed to the reactor at equimolar flowrate for a certain time.The reaction is carried out at different volumetric flowrate.The conductivity value of outlet stream is measured
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determine the molarity and weight/volume percent of acetic acid in vinegar by titration with sodium hydroxide to a phenolphthalein endpoint. This procedure may be modified by titrating an acidic beverage such 7-up or Sprite. Equipment and Material (Total Time 60 – 90 min.) Variety of Berel Pipet Long glass stirring rod Wash bottle 10-mL graduated cylinder 100 mL beakers Material NaOH‚ Sodium hydroxide Titrant solution White vinegar phenolphthalein Distilled water Discussion Acetic
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solution‚ 1.0 %‚ 1 mL Potassium hydrogen phthalate‚ KHC8H4O4‚ 2 g sodium hydroxide solution‚ NaOH‚ 0.1 M‚ 150 mL Unknown weak acid‚ 1.5g Water‚ distilled or deionized * Equipment: Balance Stir bar Beaker‚ 250mL Oven Buret‚ 50 mL pH sensor Desiccator Rising stand and buret clamp Erlenmeyer flask‚ 125mL Wash bottle with distilled water Funnel Weighing dishes‚ 2 Procedure: Part 1: Standardization of a Sodium Hydroxide Solution 1. Obtain a sample of potassium hydrogen phthalate
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