4? Explain how the data supports the role of a buffer. C. Explain how the data from Tables 1 and 2 are similar and different from the data in Tables 3 and 4. What does this indicate about a buffers ability to maintain pH when an acid or a base is added? D. What do the data in Tables 5 and 6 show about the ability of water to behave as a buffer? Considering the definition
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Scope of the experiment 10. Reference 11. Acknowledgment AIM: To prepare phenol formaldehyde plastic / Bakelite. CHEMICALS / APPARATUS REQUIRED : Beakers Phenol Formaldehyde Glass rod Spirit lamp Wire gauge Acetic acid Hydrochloric acid(HCl) Theory : This reaction is highly exothermic‚ but that is not why the plastic produced is referred to as "thermoset". Bakelite is a space-network polymer. Unlike linear and branched polymers‚ which are composed of long molecules
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Incorrect E.All of the above are solutions. Answer Key: D Question 3 of 12 4.0/ 4.0 Points Hexane‚ a nonpolar solvent‚ will dissolve which of the following substances? A.ammonium acetate B.sodium chloride Correct C.oil D.vinegar (acetic acid) E.none of the above Answer Key: C Question 4 of 12 0.0/ 4.0 Points What is the mass percent of a sodium fluoride solution prepared by dissolving 0.64 moles of sodium fluoride into 63.5 grams of water? A.29.7% Incorrect B.42.3% C.70.3% D
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1. (9 pts) Write a valid Lewis structure for each of the following. Show lone pairs and formal charges where necessary. Draw covalent bonds as lines. (a) bisulfate ion‚ HSO4- O HO S O (b) hydrogen cyanide‚ HCN O H C N (c) hydrazoic acid‚ HN3 (arranged HNNN) H N N N or H N N N 2. (10 pts) Indicate which of the following pairs do not constitute resonance structures by drawing an “X” in the space provided? O CH3C-O O - O and - CH3C O OH CH3C-OH
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technique. A study was initiated for the recovery of wax and resin using a baffle tank‚ a reboiling technique‚ then further by adding up of hydrochloric acid (HCL) and acetic acid after first boiling of wastewater. The efficiency of removal was studied using single and combined dyes. Studies on the effect of temperature‚ pH‚ cooling time‚ and acid added were done to determine the optimum efficiency on wax removal of both baffle tank and reboiling technique. From the study‚ it was found that treatment
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Introduction Acid rain refers to a phenomenon in which "[precipitation] from the atmosphere [contains] higher than normal amounts of nitric and sulfuric acids". The precipitation that results in acid rain comes from the pollution emitted by human activities‚ such as factories‚ electrical power plants and automobiles. Two main pollutants are sulfur dioxide (SO2) and nitrogen dioxide (NO2)‚ which reacts with substances in the atmosphere‚ such as water and oxygen‚ to form acid rain. While rain water
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Phenol‚ also known as carbolic acid‚ is an aromatic organic compound with the molecular formula C6H5OH. It is a white crystalline solid that is volatile. The molecule consists of a phenyl group (-C6H5) bonded to a hydroxyl group (-OH). It is mildly acidic‚ but requires careful handling due to its propensity to cause chemical burns. Phenol was first extracted from coal tar‚ but today is produced on a large scale (about 7 billion kg/year) from petroleum. It is an important industrial commodity as a
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1.1.1 Galacturonic Acid Analysis (for Pectin Analysis) Defattening of Mango Peel Powder (Tunchaiyaphum et al.‚ 2013) 1. Weigh about 3 g sample and put into thimble of the soxhlet extractor. 2. Pour in 150 mL of absolute ethanol to the flask of the soxhlet extractor. 3. Extract at boiling temperature of ethanol for 4 hours. 4. Remove solid contents from the thimble. Set aside to dry. Acid Hydrolysis of MPP (Rehman et al.‚ 2004) 1. Mix defatted peel powder with water at pH 2.5 adjusted w/ 0.1 N H2SO4
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7 b) 17.3 c) 12.2 d) 15.8 e) 7.0 3. The Ka of acetic acid is 1.8 x 10-5. What is its pKa? a) 1.8 x 10-5 b) 5.18 c) 4.74 d) -4.74 4. What is the pH of a 0.100 M solution of acetic acid? a) 1.34 x 10-3 b) 2.87 c) 1.00 d) 4.74 e) 3.74 5. What is the acetate ion (Ac- or CH3COO-) concentration of the solution in Problem #4? a) exactly zero b) 3.74 M c) 0.100 M d) 1.34 x 10-3 M e) 1.8 x 10-6 M 6. What is the percent ionization of the acetic acid in Problem #4? a) 1.34% b) 0.134% c) 0.0014% d) 1.8 x
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used in this experiment was somewhat rudimentary. It was constructed as shown in the following picture: After finding the heat capacity of the calorimeter‚ the student and partner neutralized two acids and calculated the heat of neutralization. Those two acids were hydrochloric acid and acetic acid‚ a 1.0 M solution of each was used. Observation and Results: The Heat gained by calorimeter = 355.3 J and the heat capacity of calorimeter = 28.9 J/K. For the heat of neutralization of HCl-NaOH the
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