the final few millilitres of distilled water. 8. Stopper the flask and invert several times to mix the contents and thereby ensure the solution is of uniform concentration throughout. Standardisation of Sodium Hydroxide 1. Prepare the burette and fill with the sodium hydroxide solution to 50ml. 2. Pipette the KH(C8H4O4) solution into a conical flask. Use three drops of phenolphthalein as the indicator. 3. Titrate carefully until a colour change from colourless to pink is observed
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4/2/14 Period: 1st Chemistry Sour Acids and Bitter Bases Purpose: The purpose of this lab was to observe the different reactions formed between various acids and bases with the aid of indicators. Equipment: 1. Safety goggles. 2. Droppers. 3. Red Litmus paper. 4. Blue Litmus paper. 5. pH paper. 6. Well plate. 7. Micro spatula. Materials: 1. Zinc. 2. Magnesium. 3. Iron. 4. Copper. 5. HCL. 6. HC₂H₃O₂. 7. NaOH. 8. Phenolphthalein. Procedure: Part A: 1. Add five drops
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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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nervous system stimulant found commonly in tea leaves and coffee‚ can be extracted using the method of sublimation with the use of Methylene Chloride (CH2Cl2) and Sodium Hydroxide; both can repeatedly rinse the green (unroasted) coffee beans from the caffeine. Keywords: Caffeine‚ Methylene Chloride‚ Sodium Hydroxide‚ Anhydrous Sodium Sulfate I. Introduction Caffeine is an alkaloid of the methylxanthine family. Its chemical formula is C8H10N4O2 and its systematic name is 1‚3‚7-trimethylxanthine
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EUROPEAN PHARMACOPOEIA 5.0 Acetylsalicylic acid TESTS Appearance of solution. Dissolve 1.0 g in 9 ml of alcohol R. The solution is clear (2.2.1) and colourless (2.2.2‚ Method II). Related substances. Examine by liquid chromatography (2.2.29). Prepare the solutions immediately before use. Test solution. Dissolve 0.10 g of the substance to be examined in acetonitrile for chromatography R and dilute to 10.0 ml with the same solvent. C. N‚N′-diacetyl-L-cystine‚ Reference solution (a).
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Aim: To calculate the enthalpy change of neutralization of the given pairs of acid and base. Theory: When alkali neutralizes an acid‚ a salt and water are formed. Aqueous hydrogen ions‚ H+(aq) from the acid react with the hydroxide ions‚ OH-(aq) from the alkali‚ forming water. Ionic equation: H+ (aq)+OH- (aq) → H2O (l) The identity of the salt will depend on the nature of the acid and alkali used. The combination of H+ and OH- ions in this way releases energy. In this practical‚ the enthalpy
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ACID BASE TITRATION OBJECTIVES 1. To demonstrate the basic laboratory technique of titration 2. To learn to calculate molarity based on titrations INTRODUCTION Molarity (M) or molar concentration is a common unit for expressing the concentration of solutions. It is defined as the number of moles of solute per liter of solution (or millimoles of solute per milliliter of solution). The concentration of a basic solution can be determined by titrating it with a volume of a standard acid solution (of
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have been made with phenolphthalein‚ and is evenly distributed through the entire agar cube. When the agar cube comes in contact with Sodium Hydroxide (NaOH) it will turn pink‚ and will continue to do so as diffusion occurs‚ and the Sodium Hydroxide solutions begins to be absorbed into the agar cubes‚ allowing us to later identify the distance the Sodium Hydroxide solution travelled over time. We want to examine whether ad how the rate of diffusion over time is dependent on the cubes surface area
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citric acid (HC6H8O7) and phosphoric acid (H3PO4). B. Objectives At the end of this exercise‚ you must be able to: Prepare and standardize a solution of Sodium hydroxide solution Determine the acidity of the two soft drink samples using the standardized solution Perform the right titration techniques II. Materials A. Reagents Sodium hydroxide (NaOH) pellets Potassium acid phthalate (HKC8H4O4) Phenolphthalein Soft drinks samples B. Apparatus 250-ml beaker 250-ml Erlenmeyer flask 100-ml volumetric
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food acid burette clamp 0.1M sodium hydroxide magnetic flea magnetic stirrer glass funnel 1 x 200mL volumetric flask phenolphthalein 4 x 50mL beakers Method Part A: Making the food acid Place distilled water into a 25mL beaker Rinse the 20mL pipette with distilled water then with the 0.3M food acid Once the pipette has been cleaned‚ pipette 20mL of the food acid and place it
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