Instructions You must SHOW WORK AND PROBLEM SET-UP for CREDIT. You have to SUPPORT your answers by calculations and/or reasoning. If you do not understand something in the assignment or are not sure how to approach a question - EMAIL me before you submit. This assignment must be submitted no later than November 22nd‚ 2011. 1. What is a true solution? Explain why the solute does not settle out of a solution. Is it possible to have one solid dissolved in another? Explain. In metals it would
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Kc of the reaction between Fe3+ and SCN- ions 4) Materials: Computer‚ Vernier computer interface‚ Logger Pro‚ Vernier colorimeter‚ 1plastic cuvette‚5 test tubes of 20x150mm‚ thermometer‚ 0.0020M KSCN‚ 0.002M Fe(NO3)3( IN 1.0M HNO3)‚ 0.2M Fe (NO3)3 (in 1.0M HNO3)‚ 4 pipets‚ pipet bulb‚ tissues. 5) Safety measure: Wear goggle and gloves to protect against
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CHEMISTRY PRACTICAL NOTES - SALT ANALYSIS S.No. | EXPERIMENT | OBSERVATION | INFERENCE | 1(a) | Noted the colour of the salt | BluePale greenGreenPale pinkColourless | May be Cu2+May be Fe2+May be Ni2+‚ Cu2+May be Mn2+Absence of Cu2+‚ Fe2+‚ Ni2+‚ Cu2+‚ Mn2+ | (b) | Noted the physical state of the salt | (i)Amorphous(ii)crystalline | May be CO32-May be Cl-‚ Br-‚ SO42-‚ NO3- | 2 | Action of heat:The given salt is heated in a dry test tube. | (i)Reddish brown vapours(ii)Crackling sound(iii)Yellow
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hydrochloric acid to form precipitates. In conclusion my percent recovery of copper was 100% due to the adequate amounts of solutions and achievement of proper chemical reactions. Equipment and Materials: ← Copper Metal (penny) ← Nitric Acid (HNO3)(aq) ← Sodium Hydroxide (NaOH)(aq) ← Sulfuric Acid (H2SO4)(aq) ← Ammonium Hydroxide (NH4OH)(aq) ← Hydrochloric Acid (HCl)(aq) ← Zinc powder ← 2 100 ml Beakers ← 250 ml Waste Beaker ← 400 ml Beaker ← Filter paper
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the accordingly: Solution Fe(NO3)3 KSCN HNO3 Amount 40ml 25ml 20ml 2) In 5 large test tubes mix the following substances with the according amounts as shown below: Trial Fe(NO3)3 (2x10-3M) KSCN (2x10-3M) HNO3 1 5ml 1ml 4ml 2 5ml 2ml 3ml 3 5ml 3ml 2ml 4 5ml 4ml 1ml 5 5ml 5ml 0 3) Place some of each sample in the cuvettes and perform a spectroscopy. *After adding KSCN‚ the solution turned pale yellow and when HNO3 was added it turned into amber looking color
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carried out by a professional such as a podiatrist or a foot health practitioner and requires the gentle removal of the outer ring using a scalpel. The application of astringent or powder to close the pores‚ reduce sweating and an application of Benzoin compound can be used to harden the skin. The patient should be given advice on appropriate footwear and the use of a gel toe separator to avoid the toes from rubbing together. The SMAE Institute (2012) state the hard corn normally occurs on top
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Evelyn Ramos CHEM LAB 201-003 Professor Ruddock Experiment #4 - Chemical Reactions Performed: 3/6/13 DUE: 3/13/13 Pre Lab Questions: 1. Before you can write a chemical equation‚ what must you know? You have to know what the products and reactants are. 2. What observations might you make that suggest that a chemical reaction has occurred? If a gas is produced or precipitates are formed that indicates chemical reaction. Also‚ if color changes occur or
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ACIDS AND BASES The reason that acid-base reactions are so important is that many of the things you come into contact with on a daily basis are either acids or bases. Most fruits are acids‚ as are carbonated beverages‚ tea‚ and battery acid. Common household bases include baking soda‚ ammonia‚ soap‚ and antacids. What are acids and bases? There are not one but three common definitions used to describe acids and bases: 1. Arrhenius acids and bases 2. Brønsted-Lowry acids and bases 3. Lewis acids
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Acetic acid (CH3COOH) (systematic name ethanoic acid). Vinegar‚ made from oxidation of ethanol in wine. Used to flavour and preserve food- Citric acid (C6H8O7) – citrus fruit. Used as a food additive (for flavour and as a preservative)- Carbonic acid (H2CO3) – dissolved in acid rain‚ in soft drinks. - Sulfuric acid (H2SO4) – used to make fertilisers‚ synthetic fibres‚ industrial ethanol‚ detergents and car batteries-Nitric acid (HNO3) – synthesised in huge quantities for the manufacture of fertilisers
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Abstract The chloride present in an unknown soluble sample was precipitated into silver chloride through precipitation gravimetry. The colloidal silver chloride originally formed was converted to a crystalline solid by controlling certain parameters of the experiment such as temperature‚ pH of the solution‚ and concentration of AgNO3. Once the solid was large enough‚ it could be washed‚ filtered‚ and weighed. The percentage of chloride present was found to be 24.73695223 (±0.00000006) %.
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