Investigating the Rate of Diffusion of Hydrochloric Acid into Gelatine
Introduction
============
In this experiment I am going to investigate the rate of diffusion of
Hydrochloric Acid into Gelatine. To do this I will use the same
concentration and amount acid with the gelatine being cut into
different sizes. The rate of diffusion is dependant on the
surface/volume ratio to how quick the acid is able to diffuse
throughout the whole of the gelatine.
Equipment
=========
§ Hydrochloric Acid
§ Gelatine
§ Tile
§ Test tube
§ Rubber Bung
§ Scalpel
§ Ruler
§ Stop Clock
§ Goggles
§ Measuring Cylinder
Experiment
==========
In the experiment I will first of all cut up the pieces of gelatine
into the correct sizes using the scalpel, tile and ruler. This must be
done accurately otherwise this could affect the end results. I will
then measure out 30ml of Hydrochloric Acid using the measuring
cylinder and pour it into the test tube. I will then put in the
gelatine shapes. I will then quickly put the bung in the stop and
start the stop clock. I will hold the test tube at a horizontal
position so that the acid in covering all of the surfaces of the cubes
and so all the cubes are separate being easily visible. I will write
down the time when each cube has been fully diffused, I can tell this
because it is when they turn from an orange colour to red. When the
gelatine has been fully diffused there will no orange left, just red.
Through out this experiment I will wear safety goggles to protect my
eyes from the acid. The sizes of the shapes of gelatine will be:
§ 10mm x 10mm x 10mm
§ 10mm x 10mm x 5mm
§ 10mm x 5mm x 5mm
§ 5mm x 5mm x 5mm
I have chosen these sizes carefully so that I will be able to compare
3.) Divide your 30g of white substance into the 4 test tubes evenly. You should put 7.5g into each test tube along with the water.
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· Rinse out mixture in flask and leave water running to get rid of the
Investigating the Effect of Concentration on the Rate of Diffusion Aim: To find out if concentration affects the rate of diffusion. Prediction: I predict that the higher the concentration of acid the faster the reaction will be. Hypothesis: Diffusion is the spreading out of a gas or liquid from an area of low concentration to another area where it has a lower concentration until the overall concentrations are balanced. The Hydrochloric acid (HCl) diffuses into the gelatine cube of which contains Sodium Hydroxide (NaOH), which is an alkali. When the Hydrochloric acid combines with the Sodium Hydroxide they form salt and water, which is neutral therefore turning the pink cube to clear.
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the acid was at 14 C the magnesium took 141 seconds to react and 27 C
Gelatin cryogel sheets (5%) were synthesized using glutaraldehyde as the cross-linker. The aldehyde groups of glutaraldehyde form covalent imine bonds with amino groups of gelatin. Initially different concentrations of gelatin were used (4%, 5%, 6% and 8% respectively). On physical examination of the cryogels produced with these concentrations, it was observed that at higher concentration of gelatin polymer (8%) the rate of polymerization was very fast and hence cryogel sheets formed were not proper. As the percentage of gelatin was increased the amount of cross-linker required was low i.e., the amount of cross-linker required decreases with increase in monomer concentration. Increase in polymer concentration also leads to less elasticity in the cryogel. Standardizations done for the synthesis of optimum concentrations of Gelatin and glutaraldehyde required is given in Table 1.1.
Dofasco uses hydrochloric acid to remove scale, oxides and other impurities that form on the surface of hot-rolled steel coils in a finishing process-a pickling line. Hot-rolled iron moves through baths of hydrochloric acid to remove impurities that form on the surface of the steel during the manufacturing process. The acid is used as a substance to create a clean-surfaced product. Hydrochloric acid is a clear, colorless, solution with a strong odour made of hydrogen chloride ions and water. This acid is highly corrosive and is used for many industrial purposes such as the pickling process. It is highly reactive, which is why it works efficiently to remove impurities off the surface of steel when it reacts with the steel. During the hot rolling of the
Hydrochloric acid is a strong and corrosive acid that is often used as a reagent in laboratories.
== § Test tubes X 11 § 0.10 molar dm -3 Copper (II) Sulphate solution § distilled water § egg albumen from 3 eggs. § Syringe X 12 § colorimeter § tripod § 100ml beaker § Bunsen burner § test tube holder § safety glasses § gloves § test tube pen § test tube method = == = =
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Also the investigation will be performed in a sensible manner and there is no dangerous behaviour. Prediction When the experiment is taking place I believe that the magnesium in the hydrochloric acid will begin to bubble and then disappear, I also