cancel out and the weakest will need more acid. Variables: Control | Independent | Dependent | The indicator‚ NaOH | H2SO4 HClHNO3 | The chemical reaction between the acids and alkali. | Materials / Apparatus: * H2SO4 * HCL * HNO3 * Alkali (NaOH) * Stand * Burette * Beaker * Funnel * Bunsen Burner * Crucible * Phenolphyalein Method: 1. Pour the 25 ml of NaOH into a beaker. 2. Drop three drops of phenolphyalein into the beaker. 3
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reaction is exothermic and if the enthalpy change is positive it is an endothermic reaction (Petrucci‚ Herring et al. 2011). The heat of the reaction was measured for a the neutralization reaction of four different acids which were 1.994 M HCl‚ 2.035 M HNO3 ‚ 0.5115 M phenol and HCl with unknown molar concentration. There are two different situations for the neutralization reaction because the acid used can either be a strong electrolyte or a weak electrolyte. If the acid is a strong electrolyte it will
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2. Procedure 2.1: Experimental Prep and Optimum wavelength Selection An ionic Iron solution with a known concentration of 4.047x10-3 M was obtained. A 250-mL sample of a 10-fold dilution of this ionic iron solution and 5 drops of concentrated HNO3 was made. This solution served as the source of ionic Iron for the remainder of the lab and was labeled “stock ionic Iron solution.” Next‚ a 50-mL aqueous ionic Iron and FerroZine® complex solution was prepared by adding 5.00mL stock ionic Iron‚ 3-mL of
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GRAVIMETRIC ANALYSIS OF A CHLORIDE SALT (2013) Report By: ____________ Lab Partner: ___________ Group: CHEM 1001 Tuesday AM‚ Group H Purpose: This lab was conducted in order to determine the content of chloride in an unknown salt‚ using gravimetric analysis. Theory: The salt chloride content is easy to find because it is slightly soluble‚ making it possible to turn it into a precipitate. A precipitate reaction can be done using silver
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PHARMACOGNOSY REVIEWER In pharmacognosy‚ drugs may be classified based on morphology‚ chemical constituents and therapeutic applications (NOT price in the market) Factors that influence secondary constituent: heredity‚ ontogeny‚ environment Chromatography: process based on distribution of mixture between 2 phases General Information Discoverers/Scientists Joseph Caventou & Pelletier Quinine antimalarial Pierre Robiquet Codeine/Narcotine Philip Geiger & Rudolf Brandes Hyoscyamine and
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Solutions manual: Chapter 1 Getting started © Pearson Education Australia (a division of Pearson Australia Group Pty Ltd) 2006. This page from the Chemistry Dimensions 1‚ Teacher’s Resource may be reproduced for classroom use. QUESTIONS 1 Research 2 Property Solid Liquid Gas Volume Fixed Fixed Variable Shape Fixed Variable Variable Forces between particles Yes Yes No Movement of particles Vibration and rotation Vibration‚ rotation and translation Random and chaotic
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A Study to Determine the Level of Iron and Copper in Kuala Terengganu Estuary Muhammad Ali Azraei Bin Raduan ( UK32844 ) Lecturer Dr. Kesaven a/l Bhubalan Introduction : Kuala Terengganu River estuary (5.32°-5.35°N‚ 102.95°-103.15°E) is situated on the east coast of peninsular Malaysia facing the South China Sea (figure 1). Generally‚ the Kuala Terengganu River estuary is relatively small and shallow. The total area of the estuary is approximately 8 km2
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Chemistry 112: Anion Analysis Page 7 ANION ANALYSIS M uch of the work you will be doing in the Chemistry 112 laboratory will be concerned with identifying positive and negative ions‚ that is‚ cations and anions‚ in solutions whose composition is unknown. This procedure is called QUALITATIVE ANALYSIS. The modern chemist frequently wishes to identify the constituents in a very small amount of substance‚ and so he depends heavily on instrumental methods of analysis. While the procedures
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electrocautery was used to control hemostasis. We then irrigated with saline solution and closed the subcutaneous tissue with 3-0 Vicryl interrupted and running sutures. We then used 4-0 Vicryl sutures to close the skin in a subcuticular fashion. Benzoin
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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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