Presently‚ commercial NR latex concentrate is preserved with either a high ammonia system (HA latex) at 0.7% ammonia or LA-TZ a low ammonia system (LA latex) at 0.2% ammonia) and 0.025% of 1:1 mixture of tetramethylthiuram disulphide (TMTD) and zinc oxide. The HA system poses serious environmental problem such as strong smell due to the presence of large amount of ammonia. On the other hand‚ TMTD has been implicated to produce carcinogenic nitrosamines in rubber products and is an allergen causing
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drops of 6 M NaOH were added. This was to test to see if any solution was amphoteric‚ where any insoluble metal precipitate dissolved after the additional 6 M NaOH was added. The results were recorded and each solution was disposed of. To being the ammonia test‚ 5 new centrifuge tubes were each added 10 drops of one cation and labeled correspondingly. 15 M NH4OH was then added drop wise (about 20 drops) to each solution and the color of the solution and/or the color of the precipitate formed was recorded
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knowledge on chemical engineering and made himself master of the contemporary modern chemical technologies. He innovated a new method to combine two elements nitrogen and hydrogen in order to create ammonia. Haber was awarded with various prizes for his invention of new method of producing ammonia and finally he was nominated for Nobel Prize in 1918. A significant proportion of scientists differed against granting him the Nobel Prize and they alleged him as a war criminal of WW1 because of his invention
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H2SO4‚ 6M NH3‚ 6M HCl‚ 6M NaOH‚ 1M NaCl‚ 1M Fe(NO3)3‚ 1M NiSO4‚ 1M AgNO3‚ 1M KSCN‚ 1M Ba(NO3)2‚ 1M Cu(NO3)2 respectively. The contents of the test tubes were determined by chemical experiments. Solution K-1 contained NiSO4 because when solution K-9‚ ammonia which was identified by its pungent odor‚ was added‚ an inky dark blue color was made. Iron (Fe (NO3)3) was determined to be in test tube K-2. KSCN was found in test tube K-11 since Fe (NO3)3 and KSCN makes a bloody color when mixed together. Flame
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+ Kd Complex Ion Equilibria −8 3 + 3 2 (x)(2x)2 Kd = (0.010 − x) • How many moles of ammonia must be added to 2.00 L of water so that it will just dissolve 0.010 mole of silver chloride‚ AgCl? = 6.3 ×10−8 – What is the stoichiometric amount of NH3 needed to form Ag(NH3)2+ ? • STOICHIOMETRIC amount 4x3 = 6.3×10−10 – What is the equilibrium NH3 concentration needed to maintain the silver-ammonia complex? x3 = 1.6×10−10 [ ] x = 5.4 ×10−4 M = Ag+ • EQUILIBRIUM amount 5 7 Complex Ion
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(4000 to 5000 Å) than white light‚ and so the solution looks blue. When ammonia is added to a solution of copper(II) cation‚ a deep blue color is formed immediately. The blue color is due to the complex. ion Cu(NH3)42+. Cu(H2O)42+ + 4NH3 Cu(NH3)42+ + 4H2O This complex ion‚ the tetraamminecopper(II) cation‚ has a square co-planar geometry also. The absorption spectrum of this complex ion in 0.05M ammonia is shown in Figure 1 as the solid line‚ B. In this complex‚ also‚ the light
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Report Introduction Mummification is an ancient Egyptian method which is a natural or deliberate process intended to dehydrate the body to preserve it. They done this because they believed that if a body was left to rot then it would destroy their soul‚ so they believed that the body needed to be intact to serve as host for the soul. So they preserved bodies so they could use them in the afterlife‚ where the Egyptians believed they would make a journey to another life. To start to mummify a body
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Naphthalene Ball in Water Objective: In this experiment‚ we will determine if the naphthalene can be dissolve in water or not. And what will happen in the filter paper if we stick it in the funnel and let it absorbed the fumes in the boiling water with powdered naphthalene. Materials: Evaporating dish Spatula Watch Glass Filter paper Tripod Mortar and pestle Alcohol Lamp Funnel Beaker Data: Naphthalene 1. white crystalline compound 2. has a strong odor 3. round
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it has been estimated that nearly half the Earth’s population is fed as a result of fertilisers. Fertilisers work by providing resources much needed by vegetation‚ namely Nitrogen and phosphorous. The Nitrogen in the fertiliser is in the form of ammonia or ammonium‚ these are converted by nitrifying bacteria into nitrites‚ and then a different kind of nitrifying bacteria converts the nitrites into nitrates. The nitrates are taken up into the plant through the roots where they are assimilated into
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Blanchisseusse and Maracas‚ thus identifying the impact of water quality due to human activity. The abiotic factors that were investigated are: Carbon Dioxide; Dissolved Oxygen; Total Dissolved Solids; Phosphates; Nitrates; Nitrites; pH; Temperature; Ammonia; Salinity; Alkalinity; Acidity. This study is important to improve our understanding of the relationship between patterns of water quality and environmental variables. Methods of Data Collection The investigation was carried out on Saturday 12th
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