Get the clamp ready and place the tile on the clamp, then place the conical flask on the tile.
Rinse your burette with your diluted HCl to replace any previous liquids which may intervene in the results. Now secure the burette to the clamp making sure the nozzle is facing in the conical flask. You should now have your apparatus set-up like this: 30/5230/35230/image006. gif”>Funnel Burette filled with diluted HCl Conical Flask Clamp Tile Ca(OH) and Indicator i? Now everything should be ready.
From your volumetric flask, empty out the diluted HCl into a normal beaker. Using this beaker fill the burette up to the 0 mark with a funnel. i? Start titrating slowly until the solution has totally reacted. Then record the results noting how much HCl you used. Record the results in a suitable format and repeat the experiment at least three more time for more accuracy. Finally record the average (mean) titre. i? SAFTEY: this is extremely important as you are handling hydrochloric acid.
Goggles must be worn at all times, hair must be tied back and bags must remain under the desk. If anything goes wrong, consult the teacher immediately. Always remember to work safely as HCl can be hazardous to your skin, the indicator may stain your clothing as well. (Accuracy): The pipette, burette and volumetric flask only have a percentage error of + or – 0. 1%. This is a small error.
That is why they are used in this experiment. Be sure to take precautions such as making sure that when you pour in the HCl or Ca(OH) you do not let it run down the sides because some will be left on the sides thus making an inaccuracy. As you can see above, the bold says10. 0cm3 of your Ca(OH), when instead it should have been 25. 0cm3.
The reason for this is because there was not enough of the Ca(OH) to perform all the experiments. This is a limitation due to the fact that 25. 0cm3 would have been a more accurate measure because 10. 0cm3 may not be enough for a clear result.
AnalysisJ Rough Accurate 1 Accurate 2 Accurate 3 Final burette reading cm3 37. 3 37. 2 37. 1 37. 3 Initial burette reading cm3 0 0 0 0 Volume used cm3 37. 3 37. 2 37. 1 37. 3 Mean titre cm3 37. 3 37. 2 37. 1 37. 3 This is the final part to the investigation. In this part of the investigation I aim to determine the final concentration of the limewater solution. I will go through my calculation step by step and explain what I am doing along the way. Starting off, lets look at what we have. The equation for the reaction is: 30/5230/35230/image001. gif”>Ca(OH)2(aq) + 2HCl(aq) CaCl(aq) + 2H2O(L). For the Ca(OH) we could trying to find the concentration in mol g dm-3. However we have the volume (10. 0cm3 is how much we … er remedy.
This would change the colour of the solution to mild orange which will would in order to pink at the conclusion of the titration. 5. There after I will put the flask upon a white colored tile positioned on a grip stand. I then will open the tap in the burette that may be held in the clamp stand and let the chemical p neutralise the alkali. 6. By the end of titration the limewater remedy turns lilac which indicates it has been neutralised.
7. Let me repeat the experiment at least 3 times to make that a fair check. Repeating the experiment may also ensure that the results which i get will be accurate. The response that takes place can be referred to with the help of this balanced equation: Ca (OH)2 + 2HCl i? CaCl2 + 2H2O In order to get trustworthy results from the exper … … towards the end point would be reached prior to equivalence. Varying Control You need t make sure that you take the chemicals from the same set so as to never get two different concentrations each time you test them. Temperature and pressure should have no effect on the reaction Organisation Create the equipment since shown in the diagram beneath, ensuring that the burette valve is shut.
Run de-ionised water throughout the burette and wash all of the equipment with it First of all dilute the hydrochloric acid using by having slowly 25ml of 2. 00moldm-3 HCl to 475ml of de-ionised drinking water in the 500ml beaker. In that case, using a pipette, put 100ml of the HCl solution in the burette Put 50ml of limewater right into a conical flask using the pipette then add 5 drops of methyl orange to the solution, this should turn the perfect solution is a soft orange Wide open the …… molarity 1dm3 = 10x10x10cm3 = 1000cm3 1(Molarmass) = 8. 12gdm3 Evaluation My personal practical try things out went quite nicely and I received a variety of benefits, which were suited to the task provided. My results show i got two identical effects and 1 just 1 . 1cm3 away.
Which suggests that I have been accurate and specific during the research. By being correct it came to exist by certain apparatus My spouse and i used, which in turn restricted problems. However during the experiment I ran across an array to ……
