washed again with 10 ml of water. The wash water was again decanted and discarded. The entire solid (precipitate) was transferred to a beaker to a weighed filter paper. The filter paper was folded and was kept in the locker to be observed in the next
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beaker. Add about 30 ml of deionised water to dissolve the vitamin C tablet. Once the tablet has dissolved completely‚ transfer the solution into a 250 ml volumetric flask via a plastic filter funnel. Rinse the beaker twice with some deionised water and transfer the washings into the volumetric flask. Rinse the filter funnel as well. At this point‚ more water is added carefully until the bottom of the meniscus is right on the line. Stopper the flask and complete the mixing by repeated inversions with
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the lab‚ the mass of beaker was 1.82g. The mass of the beaker plus the milk was 10.5g‚ which this makes the mass of the milk 8.33g. The pH of milk pre-acid was 8. The pH of milk post-acid was 3. The mass of the filer paper was 1.20g. The mass of the filter paper plus casein was 6.32g‚ which means the mass of the casein was 5.12g. The percentage of casein in the milk was calculated out by the equation mass of casein/ mass of milk sample × 100. The percentage that was calculated out 61%. For the optional
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Petri dish • Labeling tape and pen • Dropper pipette • Ice bath • 0.1% hydrogen peroxide solution • 3 thermometers • Liver puree • Warm-water bath • 25-mL graduated cylinder • Clock or watch with second hand • 5 50-mL beakers • Paper towels • Filter-paper disks Part A: Observe the Catalase Reaction 1. Put on apron and safety goggles. Use forceps to place a small piece of raw liver in an open petri dish. Use a dropper pipette to put a drop of hydrogen peroxide solution on the liver. CAUTION:
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As the CaC2 bubbles‚ cover the test tube and the acetylene gas will fill the test tube by displacing the water. After that‚ bring out the test tube and ignite it. For Preparation of Iodoform‚ a Halogen Derivative (or Alkyl Halide)‚ first place two milliliter of ethyl
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| |Molecular Weight of compound |204.8mw |197.4mw | Equation 1: (Mass of dried copper + mass of watch glass + mass of filter paper) – (Mass of filter paper) – (Mass of watch glass) = (Mass of elemental
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placing thermometer in solution‚ and adding 20 mL H2O2 slowly while using a magnetic stir-bar‚ and heating solution to 40 C‚ the solution turned black‚ and then became a rusty brown color later‚ after stirring. After heating solution‚ it produced bubbles‚ showing us the process of oxidization in reaction‚ and the color of the solution became dark brown. After stirring solution‚ allowing it to heat until boiling‚ and adding 8 mL of 1 M H2C2O4 (first 5 mL at once‚ the next 3 mL slowly)‚ the solution
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of clean fuel‚ plus air to provide oxygen for combustion. The amount of air needed is easy to under estimate – around one cubic meter per minute is required for every 10hp of engine power. Defective engine compartment ventilation‚ or clogged air filters‚ can therefore result in a loss of power.
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to the bubbles which rise to form froth on the surface while hydrophilic particles will sink. The froth layer that forms on the surface will then be heavily loaded with the hydrophobic mineral and can be removed as a separated product. A particle and a bubble should have in contact in order for flotation to occur wherein the bubble must be large enough for its buoyancy to lift the particle and stay on the surface. The hydrophilic particles will have much less tendency to attach to air bubbles and so
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Name: Name of lab partner: Date: Title: Determination of the valency of magnesium Objective: To study the quantitative relationship between the amount of reactant and products of a reaction. A known starting mass of magnesium and the measured collection of hydrogen gas will be used to determine the reaction stoichiometry and the valency of magnesium. Introduction: In Chemistry‚ stoichiometry is the study of the quantitative relationship between amounts of reactants and products of a reaction
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