Materials and apparatus - Time of submersion Materials - 500mL Deionised water - 2L 20% NaCl solution - 10 Dialysis Tubes - 10 beakers (250mL) - 10 petri dishes - 10 stirring rods - Sticky labels - 2 measuring cylinders (200mL) - Volumetric pipettes (50mL) - 2 teat pipettes - Cotton string - Scissors - Timer - Electronic balance - Paper towels Method 1. The beakers and measuring cylinders were rinsed and dried to remove any cause for errors. 2. Sticky notes were used to label each beaker and petri dish
Jonathan O’Donnell CHM 3120C 05/15/2014 TA: Darrell Cerrato Lab 1. Volumetric Glassware Calibration Introduction: This experiment is designed to educate proper techniques for using an analytical balance and volumetric apparatus’s. Accuracy in volume measurements are significant in analytical chemistry but all volumetric glassware have errors and obscurities linked with the measurements observed. Miniscule damage in a glassware due to aging, abuse and chemicals can create systematic errors in the
Oil Glass Bottle The oil glass bottle is made up of three trapezium prisms and a half sphere. So to find the volume of the oil glass bottle you would need to find the volume of all three truncated cones and the volume of the half sphere and plus them all together. To find the volume of the truncated cones, you need to use the formula V = π [s (R + r) + R2 + r2], this will give you the volume for all the truncated cones. Also to find the volume of the half sphere is two-thirds times pi times radius3
was submerged in the heated sand bath) began to boil. While the running the reflux, a 5 ¾ inch Pasteur pipette was obtained and clamped vertically with the tip facing downward. A small amount of glass wool was placed inside of the pipette and pushed down to block the narrowing end by a wooden boiling stick. A total of 100 mg (0.100 g) of celite was weighed out and was carefully added into the pipette as an additional layer atop the glass wool stopper. Once the 20 minutes elapsed, the reflux-round bottom
There were minimal risks in this section of the practical as glucose is a sugar and is not harmful; however we still wore lab coats and goggles to protect our clothing and eyes from any accidental splashing. We also had to take care when using the pipettes so not to stab ourselves or anyone with them so we had to make sure that we had full concentration on the task and that no one was in too close proximity of you so that they are in danger of getting injured. We also had be careful not to smash any
Natural Indicators Each year millions of tourists travel to the woods of New England, upstate New York, Wisconsin, and Canada to witness the appearance of brilliant autumn colors. Sugar maples, red oaks, sumac, birch and other trees and shrubs turn from green to bright red, orange, and yellow. The short, cool days of autumn bring an end to the production of chlorophyll (the green light-gathering pigment). As chlorophyll gradually breaks down, the colors of the more stable carotenoid (yellow/orange)
Experiment No. ___ SOME COMMON UNITS USED IN SCIENCE INTRODUCTION: A unit of measurement is a definite magnitude of a physical quantity, defined and adopted by convention or by law that is used as a standard for measurement of the same physical quantity. Any other value of the physical quantity can be expressed as a simple multiple of the unit of measurement. For example, length is a physical quantity. The meter is a unit of length that represents a definite predetermined length. When we say
vinegar. One procedure uses phenolphthalein while the other uses a pH meter. Bothe procedures can be found on “An Analysis of a Household Acid: Titrating Vinegar” by the Department of Chemistry at APSU. The first procedure requires one 10mL volumetric pipette, one 50mL buret, two small beakers, one labeled “vinegar” and the other labeled “NaOH”, three 250mL Erlenmeyer flasks, labeled one, two and three, and one large beaker for waste collection. Collect 50mL of vinegar in the beaker labeled “vinegar” and
The precision of a 50 ml beaker, 25 ml grad. cylinder., and a 25 ml pipette were determined by transferring each type to a tared 50 ml beaker. The density of copper was determined through volume displacement in water. The pipette was fond to be the most precise with a mean volume of 24.843±0.184ml. While the 25 ml cylinder had a volume of 24.601±0.708 ml and the 50 ml beaker had a volume of 24.074±1.98 ml. The density of copper was found to be 9.190±0.836, with an accuracy of 2.567%. The difference
Finding the Exact Concentration of Sulphuric Acid in a Solution Through a Titration Aim: To find the exact concentration of sulphuric acid in a solution through a titration. The titration is between sulphuric acid and sodium carbonate has to be in liquid for in order to carry out the experiment so it is dissolved into distilled water to a concentration of 0.1 mol dm³ Introduction- ------------- During the extraction of a metal from its ore, sulphuric dioxide is often produced. This
Determining the Concentration of a Sodium Carbonate Solution Calculating the quantities and the concentration of the reagents Sodium Carbonate + Hydrochloric acidà Sodium Chloride + Carbon Dioxide + Water Na CO + 2HCL à 2NaCl + CO +H O Calculating the approximate concentration of the sodium carbonate solution (mol dm ³) Approx = 5 5 = 0.0472mol dm ³ Concentration Mr
of the chosen concentration. The equipment need is as below: · Solid calcium hydroxide · Methyl orange indicator · Volumetric flask (250cm3) · Clamp and boss · Clamp stand · Burette (50cm3) · Conical flask · Pipette (25cm3) · Pipette filler · Distilled water · White spotting tile · Hydrochloric acid of chosen concentration · Beaker x2 · Rubber bung · Funnel x2 · Electronic scale ‘The maximum mass of calcium hydroxide needed to produce 1dm3 of
50.0cm3 pipette · 100.00cm3 graduation flask · deionised water · dropper · 50.0cm3 pipette · 250.00cm3 graduation flask × 2 Method- · Pipette 50.0cm3 of the aqueous sulphuric acid into a 100.00cm3 graduation flask · Add deionised water up to the graduation mark and agitate to ensure a homogenous solution. · Pipette 25.0cm3 of the new solution into a 250.00cm3 graduation flask · Add deionised water up to the graduation mark and agitate. · Pipette 25.0cm3
indicator (3 drops) Ø Distilled water Ø Spatula Ø Watch Glass (23.56g) Ø Glass rod Ø 250cm³ Beaker x2 Ø 250cm³ Volumetric flask Ø 250cm³ Conical flask Ø Funnel Ø 25cm³ Pipette and pipette filler Ø Burette Ø Weighing scales Ø White tile Ø Safety glasses/lab coat Ø Dropping pipette N.B All the apparatus above is accurately calibrated. Variables The control variables, which are the factors I shall be keeping the
Comparing Amount of Glucose in Orange Fruit, Grapefruit and Lemon Fruit I have been given 4% of glucose solution, benedict's solution and distilled water to find out the concentration of glucose of these three juices; orange, lemon, and grapefruit. The method of serial dilution has to be done to work out the concentration; this is because the concentration of glucose is far too concentrated. A dilution factor has to be worked out; I will be using a dilution factor of 5, which means the
solubility of the Ca(OH)2 is between 1 to 1.5g per dm3. Also I am given a standard solution of 1M hydrochloric acid (HCl) which may have to be diluted to suit the measuring needs of the experiment. Apparatus: [IMAGE] * 1g of Ca(OH)2. * Pipette 25cm3 * 2 x 500cm3 beaker * Conical flask 250cm3 * Burette * White tile * Burette stand * Stand * Indicator * 300cm3 of Hydrochloric acid- standard solution (concentration of 0.05M) * Distilled water * Filter Paper
The purpose of this investigation is to record the amount of time taken for a reaction to occur when sodium thiosulphate is mixed with hydrochloric acid. The equation for this reaction is: Na2S2O3 + 2HCl → 2NaCl + S + SO2 +H2O Sodium thiosulphate (Na2S2O3), after reacting with Hydrochloric Acid (HCl) produces yellow sulphur, which is the cause of the solution becoming cloudy. The amount of time taken for the reaction to occur is known as the reaction rate. The rate of a reaction can be commonly
placed 1ml of yeast into the five test tubes all containing 1 ml of the test solutions. A 1ml graduated pipette was placed separately in each of the test tubes and extracted 1ml of the solutions into it. Once the mixture was in the pipette, someone from the group placed a piece of parafilm securely on the open end of the pipette and upon completion removed the top part of the graduated pipette.
An Analysis on the Future Cloning Cloning has been going on in the natural world for thousands of years. A clone is simply one living thing made from another, leading to two organisms with the same set of genes. In that sense, identical twins are clones, because they have identical DNA. Sometimes, plants are self-pollinated, producing seeds and eventually more plants with the same genetic code. Techniques have improved rapidly, making it possible to clone cattle, sheep and other farm
The Relative Formula Mass of an Unknown Acid Table of contents 1.1 Aim of the experiment 2 1.2 Introduction 2 1.3 Equipments and apparatus 2 1.4 Safety precautions 2 2.1 Procedure 3 2.2 Apparatus setup 3 2.3 Analysis 4 3.1 Implementing 5 3.2 Analyzing 6 4.1 Evaluation 8 4.2 Comparison between experimental Mr with value