to reach its equilibrium then the less concentrated acids. Introduction Sodium Hydroxide (NaOH) is a strong base and when it is titrated with a strong acid the equivalence point will be expected to be a pH of 7 (wyzant.com‚ Feb. 12). NaOH is also known as caustic soda‚ it is soluble in water‚ ethanol‚ and glycerol but is insoluble in acetone and ether (nap.edu‚ Feb. 12). When Phenolphthalein a weak acid and when hydroxide ions (NaOH) is added the indicator is turned pink (Chemguide.co.uk‚ Feb.12)
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carbonate in egg shells reacts with an excess of hydrochloric acid so that it is sure that a reaction is occurring. The excess HCl is then diluted because of the egg shell with a drop of phenolphthalein added and is then titrated in aliquots with sodium hydroxide solution. This is the reaction for determining the excess of HCl: 2HCl (aq) + CaCO3(s) -→ Ca2+ (aq) + CO2(g) + H2O(l) + 2Cl- (aq) Materials: eggshell burette‚ 50 cm³‚ and stand pipette + filler‚ 20 cm³ plastic foil phenolphthalein
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(24) hours. After cutting them into very small pieces‚ they will then be combined with different chemicals such as polyvinyl alcohol‚ sodium hydroxide in aqueous solution‚ glue‚ and glycerol to produce biodegradable plastics. Three samples of plastics will be made with different amounts of talahib ‚ as shown in the table below. Sample Talahib Sodium Hydroxide (NaOH) (mL) Glycerol (mL) Glue (mL) Distilled Water A 10 10 5 10 100 B 20 10 5 10 100 C 30 10 5 10 100
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Pre-Laboratory Assignment 1. What are the hazards associated with sodium hydroxide (NaOH) solution? Sodium hydroxide solutions‚ especially in high concentrations‚ are toxic and corrosive. 2. (a) What buret reading should you record when the liquid level is as shown in Figure 2? In Figure 2‚ the lower meniscus lies below the 3 mL line and 4 minor gradations that signify 0.1 values. Estimating the uncertain digit to be 0.04 mL‚ the reading we record for this particular buret is 3.44 mL.
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amount of calcium carbonate content of brown and white eggshells. MATERIALS: white and brown eggshells‚ water‚ deionized water‚ beaker‚ pipet‚ flask‚ test tube brush‚ funnel‚ hotplate‚ mortar‚ pestle‚ ethanol‚ HCl‚ phenolphthalein indicator‚ sodium hydroxide PROCEDURE: (Complete for both white and brown eggshells) 1. Get one egg and beaker and bring it to your lab station. 2. Break the egg into a beaker. 3. Add water to the egg and stir before you pour it down the drain. 4. Wash the shell
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Pipets • Spatula • Test tubes Materials: Ammonium carbonate‚ 0.5g Calcium carbonate‚ 0.5g Copper chloride solution‚ 4mL Hydrochloric acid‚ 4mL Magnesium ribbon‚ 2-4 cm strips Phenolphthalein indicator‚ 1 drop Sodium hydroxide solution‚ 1mL Sodium phosphate solution‚ 1mL Water Zinc‚ mossy‚ or zinc shot‚ 1-2 pieces Introduction: In this lab we will classify different chemical reactions. Classifying chemical reactions allows us to predict what chemical reactions will
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Raul Siegers Background/ Introduction: Sodium hydroxides‚ NaOH Is a commonly used titrant for determining the concentration of acidic solutions. We also have guidelines and formulas for achieving and measuring the concentration for example concentration = amount per litre i.e. grams/litre (g/L) or mol/L (M = Molarity) Primary standard and its importance can be justified by its accuracy to find the concentration of a solution‚ in this lab report; we will measure the concentration of NaOH and
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infidels) through a titration calculation. If you know how to do these‚ go straight to the questions at the end.The question:10.0 cm3 of a solution of potassium hydroxide was titrated with a 0.10 M[1] solution of hydrochloric acid. 13.5 cm3 of the acid was required for neutralization. Calculate the concentration of the potassium hydroxide solution.Step 1Write down everything you know. Placing the one you know most about on the left (you don’t have to do this‚ but its just a good idea). Hydrochloric
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29th Oct 12th Nov LS4002 - EXPERIMENT 1 Quantitative Analysis by Acid-Base Titration - A Determination of the Quantity of Aspirin in Powdered Tablets Aims In this experiment a solution of sodium hydroxide will be standardised using potassium hydrogen pthalate. This standardised sodium hydroxide solution will then be used to titrate powdered aspirin tablets. The percentage of aspirin in the powder tablets will then be calculated. Introduction Acid-base titrations are an example of what
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Aspirin Background Aspirin Aspirin‚ or acetylsalicylic acid (ASA) is a salicylate drug‚ and is generally used as an analgesic (something that relieves pain without producing anaesthesia or loss of consciousness) for minor aches and pains‚ to reduce fever (an antipyretic)‚ and also as an anti-inflammatory drug. Aspirin works by prohibiting biological substances such as prostaglandins. Many different prostaglandins exist in the human body each serving a plethora of physical functions.
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