ACIDS‚ BASES AND SALTS 1. What are indicators? What are the different types of indicators? An indicator is a dye which changes colour when put into an acid or a base. The different kinds of indicators are- Natural indicators- Litmus is a natural indicator‚ litmus solution is a purple dye which is extracted from a plant called lichen. Litmus turns red in acidic solutions and blue in basic solutions. Other
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color or also the formation of a precipitate. Materiel needed: Test tubes Rack of test tubes Plastic droppers Beakers Procedure: We prepare 7 beakers of 7 different solutions (that we mark from 1→ 7). We put separately around 50 ml of: HCl NaOH Na2CO3 K2CrO4 CaCl2 CuSO4 Unknown substance Using plastic droppers we mix 10 drops of one solution with 10 drops of another solution in a test tube‚ to get all in all 20 different test tubes. We then note the observation for each test tube
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OBJECTIVE: To determine and compare the 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
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Introduction: Calcium hydroxide is a soft white caustic powder used in making mortar‚ cements‚ calcium salts‚ paints‚ and petrochemicals. It is also used in saltwater aquaria to make up kalkwasser/limewater solutions for reef tanks‚ and is used as a pH regulating agent. Notice that calcium hydroxide is divalent and thus has twice the neutralizing power as molecules like NaOH that are monovalent. A Calcium Hydroxide Molecule: Calcium hydroxide is manufactured industrially by adding
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_________________________________ Period ___ Date __/__/__ 4 Reactions in Aqueous Solution Acid-Base & Gas Forming Equations Solutions of Strong Acids & Strong Bases 1. Solutions of hydrochloric acid and barium hydroxide are mixed. 2 HCl + Ba(OH)2 BaCl2 + 2 H2O 2 H+ + 2 Cl-
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EXPERIMENT-1 CHEMICAL REACTIONS AIM: To perform and observe the following reactions and classify them into: (i) Combination reaction (action of water on quick lime) (ii) Decomposition reaction (action of heat on ferrous sulphate crystals) (iii) Displacement reaction (iron nails kept in copper sulphate solution) (vi)Double decomposition reaction (reaction between sodium sulphate and barium chloride) APPARATUS REQUIRED: 1. A rack of at least six clean test tubes and a boiling
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ANTACIDS- Classification and Mechanism of Action INTRODUCTION Antacids are defined as a substance‚ generally a base‚ which counteracts stomach acidity. The name antacid means anti-acid (against acid). Antacids are the primary treatment for ailments such as gastric reflux‚ gastritis‚ upset stomach and heartburn. Hydrochloric acid is secreted by the stomach to kill harmful organisms‚ aid digestion and activate digestive enzymes. Excess secretion of acid into stomach or impaired resistance by
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come from the dissolved man is therefore 0.3718 – 0.0331 = 0.3387g. How much phosphorus was present in the 100.0mL sample? Is this quantity consistent with a dissolved man? 7-10) Finely ground mineral (0.6324g) was dissolved in 25mL of boiling 4M HCl and diluted with 175mL H2O containing two drops of methyl red indicator. The solution was heated to 100 degree C‚ and 50mL of warm solution containing 2.0g (NH4)2 C2O4 were slowly added to precipitate CaC2O4. Then 6M NH3 was added until the indicator
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Abstract Water “hardness” was analyzed in this experiment‚ through the determination of CaCO3 concentration. This was achieved by the titration of an unknown solution using a standardized 0.1M EDTA‚ and addition of Eriochrome Black T to the unknown‚ to indicate the endpoint of the titration. The average concentration of CaCO3 obtained was 1034 ppm‚ with a standard deviation of 2.4495. The results indicate that the unknown solution can be considered as hard water. Introduction The
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Water Analysis Lab Report Purpose: In this lab we will be testing a number of water samples. These water samples come from various water sources. Each of these water samples will undergo four different tests. The four tests include a pH test‚ a conductivity test‚ a total and phenolphthalein and alkalinity test‚ and a total hardness test. This lab requires comprehension of lab material and techniques learned in prior labs (Kippenhan‚ 2012). Procedure: Each
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