Effect Of Reactant Concentration On Reaction Rate . . Research

Finally I put the bung in the volumetric flask, and I relentlessly inverted it to fully mix the solution.

Prepare timer to start at the exact time the Alka Seltzer is dropped into the beaker of water.

The first step that needed to be done in this experiment was adding hydrochloric acid (HCl)

The sunlight could affect the speed therefore the experiment will take place in the shade, so that temperature shouldn't change the reaction speed, we will check by using a thermometer. Also the same amount of hydrochloric acid and sodium thiosulphate will be mixed each time so that the concentration changes will affect the same amount of hydrochloric acid and sodium thiosulphate. The concentration of the hydrochloric acid will be changing each time to test if it speeds up a reaction. The speed for the light intensity to drop by 10% will be measured after each attempt so that the affects of concentration changes can be recorded. Each concentration will be tested three times and an average will be worked out, to see if there were any anomalies within the experiment.

1. The time for the phenolphthalein to turn from pink to colourless will be taken using the stopwatch.

9. The stop watch was stopped once the “X” was no longer visible and obscured by the now opaque liquid solution.

lab bench. Place a beaker from the drawer on the stir plate. Drag the bottle of NH3 to the 5 mL graduated cylinder (the smallest one) by the sink and fill the cylinder by dropping the bottle on the cylinder. Now drag the 5 mL graduated cylinder to the beaker on the stir plate and add the 5 mL of

Measure 500ml of tap water in the 500cm3 beaker, then measure 5g of sodium hydrogen carbonate using the 50cm3 beaker and weight scale and place in the beaker of water, using the glass rod to dissolve it into the mixture.

7. Using the slider on the right hand side, add NaOH to the HCl in the Erlenmeyer flask (This action is known as titrate). Add the indicator until the color of the indicator turns a light shade of pink.

Add RO water to the 25 ml volumetric flask up to the mark. Put stopper on the flask and shake it properly.

5.Wait 5 minutes. During these 5 minutes, set all 4 of the syringe plungers on the gas measuring mechanism at 2mL.

Dispense .5 mL water into the already weighed conical vial, replace cap and face insert on its down side.

Add the sodium hydroxide drop by drop until the end of the point is reached. The sodium hydroxide should be added while maintaining a gentle swirling motion of the flask. The solution should be a very light shade of pink when the titration is finished. Record the final burette reading. Repeat the titration three more

Submerge the graduated cylinder in the plastic tub so that it is completely filled with water. Hold the open end of the graduated cylinder and move it vertically upside-down where the open end of the graduated cylinder is still submerged in the plastic tub. Clamp the graduated cylinder the ring stand of the lab table to keep it in place. perforate a hole in the top of the rubber cork for the solution container. Cut a straw the length of about four inches. place the straw inside of the rubber cork hole. Set up your timer for two minutes.

1. Measure 15cm3 of the alcohol provided and 10cm3 ethanoic acid into the 50cm3 pear-shaped quick fit flask. A problem with this step of the experiment was that the quickfit was difficult to assemble. This was the first step needed so that the experiment could begin. 2.