Apparatus: Weighing balance, beaker 100ml, paper towel/ filter paper, aluminium foil, marking pen, labeling pen, measuring cylinder 100ml and stopwatch Variables: Variables | Method to handle | Independent: The concentration of the sodium chloride solution. | Used different concentration of sodium chloride such as 0%, 5%, 10%, 15%, 20%. | Dependent: The difference in mass of the quail’s egg | Weigh the mass of the quail’s egg using a weigh balance before putting it into the sodium chloride solution and after 24 hours being in the solution. | Controlled: * Type of egg * The type of solution that cover the egg. * Use the same volume of sodium chloride solution.
Eggshell Titration Lab Report LIU-1 Mr. Silva Beko Liu February 25, 2012 Purpose: Eggshells are composed in part of calcium carbonate. Calcium carbonate reacts with an acid to produce carbon dio xide, water, and a salt. The calcium carbonate in the sample eggshell will be determined by means of an acid/base back-titration. Procedure: 1.Wash an empty eggshell with distilled water and carefully peel all the membranes from its inside. Place all of the shell in premassed breaker and dry the shell in the drying oven at 110 degree Celsius.
DATE: 9th AUGUST 2011 TITLE: INVESTIGATION OSMOSIS IN QUAILS’ (Coturnix japonica) EGG Research Question How does different concentration of sodium chloride solution which is 0%, 5%, 10%, 15% and 20%, affect the mass of de-shelled quail’s eggs after they are immersed in sodium chloride solution for 1 day(24 hours)? Variables Table 1: Independent and Dependent Variables Variables | Units | Range | Independent variable | Concentration of sodium chloride solution | mililitre(ml) | Concentration of 0%, 5%, 10%, 15% and 20%. | Dependent variable | Change in the mass of quail’s egg | gram(g) | Difference between initial and final mass of quail’s egg | Table 2: Controlled Variables and Its Possible Effects On The Experiment. Controlled variables | Units | Possible effects | Time taken of the quail’s eggs are being immersed | Hours | The long time taken of the quail’s egg are being immersed in the sodium chloride solution which is 24 hours is kept constant.This causes the change of mass of the quail’s egg resultant from the osmosis process. | Volume of sodium chloride solution used | Millilitre(ml) | The volume of sodium chloride solution is kept constant so that the water molecules in each solution are the same.
Investigation of Osmosis in Quails’ (Coturnix japonica) Egg Research Question What is the effect of different concentration of sodium hydroxide solution on de-shelled quails’ egg? The concentration of sodium chloride used is 0%, 5%, 10%, 15% and 20%. How does the different concentration of sodium hydroxide solution affect the change of mass of quail’s eggs when the eggs are immersed in each solution and left for more than 24 hours? Variables variables Method of Controlling Independent Concentration of Sodium chloride Solution The concentration of sodium hydroxide solution prepared and used for this experiment is 0%, 5%, 10%, 15% and 20%. Dependent The average change of mass of quails egg The initial mass of each quails’ eggs is weighed and the eggs is weighed again after 24 hours.
First ~2 g of the previously prepared soap is dissolved into 100 ml of boiling distilled water. Next the same process is followed for dissolving the detergent. Before progressing the pH of both the soap and detergent is determined. Once this is done, 4 drops of mineral oil is added to each of
The reaction used to determine the leftover acid is: HCl (aq) + NaOH (aq) H2O + Na+ (aq) + Cl- (aq) Aim To measure the percent by mass of CaCO3 in an eggshell. Variables Independent variables: Mass of calcium carbonate in eggshell. The mass of calcium carbonate in the egg shell will be constant as the shell is taken form one egg itself. Dependent variables: Number of moles of hydrochloric acid used. The number of moles of that reacts with the calcium carbonate will vary according to the mass of calcium carbonate that is present in eggshell.
Gravimetric Determination of Sulfate Purpose The purpose of this lab is to determine the percentage of sulfate in the hydrate by precipitating the sulfate as barium sulfate. Materials Filler paper Sodium sulfate Graduated cylinder Bunsen burner Watch glass Beakers (250 mL, 400 mL) Rubber bulb Graduated pipette Beaker tongs Funnel Filter Paper Sodium Sulfate Drying oven Wash bottle Stirring rod Silver nitrate Hydrochloric acid Distilled water Small test tube Procedures First, .4861 grams of sodium sulfate was placed into a clean 400mL beaker. Exactly 200mL of water and 1mL of HCl was added to the same beaker. A watch glass was placed on the beaker and the solution was heated using the Bunsen burner to a gentle boil. The watch glass was removed with the beaker tongs.
Aim : To investigate the average different in mass of five quail’s eggs in five different concentration of sodium chloride solution. Research question : How do the five different concentration of sodium chloride solution affect the average different in mass of five quail’s eggs ? Introduction : In this experiment, we are investigating the effect of osmosis when quail’s egg are immersed in different concentration of sodium chloride solution. “When a cell membrane is said to be selectively permeable, it means that the cell membrane controls what substances pass in and out through the membrane. This characteristic of cell membranes plays a great role in passive transport.
(Amount of water) Variables: • Dependent Variables: Mass change of eggs • Independent Variables: Concentration amount of solute in water. • Constant Variables: Time • Control Variables: initial mass of eggs, temperature Procedure: We took our equipment such as beaker, paper towel, beaker, electronic balance, plastic spoon and 150 ml 30% salt solution (each group has different solutions.) Before this process we had to decalcify the eggs. In this experiment it is really important to decalcify the eggs to remove outer shell and to reach the semipermeable membrane of the eggs since the main aim of the experiment is to observe osmosis thorough a semi permeable membrane. Leaving the eggs in vinegar for 72 hours does decalcification.
ROOH + 2KI I2 + 2KOH + RO- The amount of Iodine produced can be further determined by titration with sodium thiosulphate (NaS2O3) using soluble starch to indicate the endpoint (color change from blue to colorless) I2+NaS2O3 S2O3 + 2NaI After the titrations, we can calculate the P.V. value using the formula: P.V. = [ SxM / Sample weight of oil (g) ] x1000 Where S = volume (inml) of sodium thiosulphate solution used in titration and M = molar concentration of the sodium thiosulphate solution. For experiment two, the thiobarbituric acid test (TBA test) was performed. This test is based on the assumption that malonaldehyde, one of the byproducts formed during lipid oxidation, reacts with thiobarbituric acid and form a red chromogn.