How accuracy may be ensured in techniques used
Unit 4
M1: Explain how accuracy may be ensured in the techniques used
Cynthia Nzeh
Task 1
1) Discuss how your choice of equipment and how it affected the accuracy of your method. Discuss good volumetric technique.
2) Calculate the apparatus error for the method used.
3) Given the value calculated by the senior technician calculate your error and comment on this error in relation to the apparatus error of the method.
In the titration, I used these available instruments to ensure my results would be as accurate as possible.
Volumetric burette: This instrument was filled with the sodium hydroxide solution that would be gradually added to the vinegar solution. The burette was used instead of a measuring cylinder as it gives a finer volume reading. It has a tap which enables the user to quickly and easily stop the amount of sodium hydroxide solution that pours out. However using a piston burette instead of a volumetric burette may have increased the chances of gaining more accurate results. This is because the piston burette delivers precision bore and plunger.
White tile: The tile was used to be able to observe the colour change of the solution in the conical flask better. By placing the white tile it allowed us to see the colour change more easily and quickly therefore increasing our chances of closing the burette tap on time and giving us closer and possibly more accurate results. If non clear paper was used or no paper at all, the colour change of the solution would not have been spotted as quickly therefore increasing the time taken to close the burette tap to stop sodium hydroxide being added to the vinegar solution. The increase of sodium hydroxide solution would mean that the results obtained would not be the accurate or close to the accurate value.
Funnel: This piece of equipment was added to the top of the burette and it was used to channel the sodium hydroxide solution into the burette. The mouth of the burette was too small to pour the sodium hydroxide
M1: Explain how accuracy may be ensured in the techniques used
Cynthia Nzeh
Task 1
1) Discuss how your choice of equipment and how it affected the accuracy of your method. Discuss good volumetric technique.
2) Calculate the apparatus error for the method used.
3) Given the value calculated by the senior technician calculate your error and comment on this error in relation to the apparatus error of the method.
In the titration, I used these available instruments to ensure my results would be as accurate as possible.
Volumetric burette: This instrument was filled with the sodium hydroxide solution that would be gradually added to the vinegar solution. The burette was used instead of a measuring cylinder as it gives a finer volume reading. It has a tap which enables the user to quickly and easily stop the amount of sodium hydroxide solution that pours out. However using a piston burette instead of a volumetric burette may have increased the chances of gaining more accurate results. This is because the piston burette delivers precision bore and plunger.
White tile: The tile was used to be able to observe the colour change of the solution in the conical flask better. By placing the white tile it allowed us to see the colour change more easily and quickly therefore increasing our chances of closing the burette tap on time and giving us closer and possibly more accurate results. If non clear paper was used or no paper at all, the colour change of the solution would not have been spotted as quickly therefore increasing the time taken to close the burette tap to stop sodium hydroxide being added to the vinegar solution. The increase of sodium hydroxide solution would mean that the results obtained would not be the accurate or close to the accurate value.
Funnel: This piece of equipment was added to the top of the burette and it was used to channel the sodium hydroxide solution into the burette. The mouth of the burette was too small to pour the sodium hydroxide