Any strong acid will release approximately - 57 kJ/mol of energy on neutralisation with strong base. This energy release is due to the formation of water molecules from the H+ ions from the acid reacting with the OH- ions from the base. H+(aq) + OH-(aq) H2O(l) When a weak acid is neutralised some of the energy is needed to dissociate the molecules to make the hydrogen ions available for neutralisation. The result is a value for neutralisation enthalpy lower than - 57 kJ/mol (numerically
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Vitamin A Overview Vitamin A is a vitamin. It can be found in many fruits‚ vegetables‚ eggs‚ whole milk‚ butter‚ fortified margarine‚ meat‚ and oily saltwater fish. It can also be made in a laboratory. Uses treatment and prevention of vitamin A deficiency. Vitamin A deficiency can occur in people with protein deficiency‚ diabetes‚ over-active thyroid‚ fever‚ liver disease‚ cystic fibrosis‚ or an inherited disorder called abetalipoproteinemia. Diseases i. Night Blindness: In the early stages
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MgCl2(aq) 2. Determine the partial pressure of the hydrogen gas collected in the gas collection tube. The partial pressure of the hydrogen gas is 1.07 atm 3. Calculate the moles of hydrogen gas collected. pv=mrt ; n= .0013mol of hydrogen gas 4. If magnesium was the limiting reactant in this lab‚ calculate the theoretical yield of the gaseous product. Show all steps of your calculation. 0.03184 g Mg(1mol Mg/ 24.3050 g Mg)= 0.0013mols Mg 0.0013mols Mg(1mol H2/ 1mol Mg)= .0013 1. Determine the percent
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b(4.5) Preparation of Salts – Reactions with Acids: Learn these General Equations and their Examples: 1. ACID + METAL –––––––> SALT + HYDROGEN Hydrochloric acid + Magnesium Magnesium Chloride + Hydrogen 2HCl(aq) + 2Mg(s) 2MgCl(aq) + H2(g) Sulphuric acid + Zinc Zinc Sulphate + Hydrogen H2SO4(aq) + Zn(s) ZnSO4(aq) + H2(g) Nitric acid + Aluminium Aluminium Nitrate + Hydrogen 2HNO3(aq) + 2Al(s) 2AlNO3(aq) + H2(g) 2. ACID + BASE –––––––> SALT + WATER Hydrochloric
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conditions. The ideal gas law was tested using the reaction: Mg (s) + 2HCl2 (aq) H2 (g) Procedure: 1. Ribbons of magnesium (5) were cut to the approximate length of the instructor’s example and were weighed separately on scale #1. 2. HCl provided by the instructor was added to a eudiometer tube (8mL). The rest of the tube was filled with water. One of the magnesium tapes was wrapped around a piece of copper wire in the opening of the tube. 3. The eudiometer tube was then inverted
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The Grignard Reaction Abstract Through the use of the Grignard reaction‚ a carbon-carbon bond was formed‚ thereby resulting in the formation of triphenylmethanol from phenyl magnesium bromide and benzophenone. A recrystallization was performed to purify the Grignard product by dissolving the product in methanol. From here‚ a melting point range of 147.0 °C to 150.8 °C was obtained. The purified product yielded an IR spectrum with major peaks of 3471.82 cm-1‚ 3060.90 cm-1‚ 1597.38 cm-1‚ and 1489
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Rusting of iron couplingCertification : It has been certified that Akash Sharma having CBSE Roll No. Studying in XII-A (Science)‚ during the academic year 2010-11 has completed a project on the Study of the Affect of Metal Coupling on the Rusting of Iron and has given satisfactory account of this in his project report Shri D.K Gupta External Examiner PGT Chemistry Signature Signature Declaration : I ‚ Akash Sharma of Class XII A (Science)
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the top on and recorded what happened. Then they opened the dish a put a drop of phenolphthalein on each element and recorded the reaction. The students discovered that sodium and magnesium reacted‚ but aluminum did not. Sodium turned into a gas when it touched water and then turned pink with the phenolphthalein. Magnesium bubbled with the water and then turned slightly pink with the phenolphthalein. Aluminium had no reaction to the water or to the phenolphthalein. After that‚ the students washed out
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CERTIFICATE ACKNOWLEDGEMENTS "There are times when silence speaks so much more loudly than words of praise to only as good as belittle a person‚ whose words do not express‚ but only put a veneer over true feelings‚ which are of gratitude at this point of time." I would like to express my sincere gratitude to my chemistry teachers Mrs. Meenakshi‚ Mrs. Sonali and Mrs. Shampa for their vital support‚ guidance and encouragement - without which this project would not have come forth. I would
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and alkalinity found in the water by titration methods. This is used to calculate the concentrations of calcium and magnesium found in the water. Principles: The hardness of water is determined to provide a measure of the quality of water for household and industrial use. Hard water is not a health hazard. Drinking hard water contributes a small amount of calcium and magnesium towards humans dietary needs. Hard water is caused by metal ions (salts) being dissolved in the ground water. We measure
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