When filling the buret with NaOH solution, you left an air bubble in the buret tip. The bubble was released durning your first KHP titration. Would the following technique error result in an erroneously high or reeoneously low calculated molarity of NaOH solution? explain briefly the reasoning for your answer
So the fluid levels in the burret reflected using more NaOH than you actually did use..which means you think you used xxxx ml, but you actually used xxxx+bubblevolume. What effect did that have on calcs?
The technique error of leaving an air bubble in the buret tip can result in an erroneously low calculated molarity of the NaOH solution.
When performing a titration, you are typically trying to determine the concentration of one solution (the titrant) by reacting it with a known concentration of another solution (the analyte). In this case, you are trying to determine the molarity of the NaOH solution by titrating it against KHP (potassium hydrogen phthalate).
If there is an air bubble present in the buret tip and it is released during the titration, it can lead to less NaOH solution being delivered during the titration process. This means that the volume of NaOH solution used in the titration would be lower than what was actually required to completely react with the KHP. As a result, the calculated molarity of the NaOH solution would be lower than the actual molarity.
To ensure accurate results, it is important to eliminate air bubbles from the buret tip before starting the titration.
The presence of an air bubble in the buret tip during the titration can lead to a systematic error in the calculated molarity of NaOH solution. Specifically, it would result in an erroneously high calculated molarity of NaOH solution.
When titrating the KHP (potassium hydrogen phthalate) with NaOH, the balanced chemical equation is:
KHP + NaOH -> NaKP + H2O
Since NaOH is being titrated into the KHP solution to determine its concentration, the volume of NaOH solution used is directly related to the concentration of NaOH. If an air bubble is present during the titration, it essentially contributes extra volume to the NaOH solution, leading to an overestimation of the volume used.
Consequently, the calculated molarity of NaOH will appear higher than the actual value because the volume of NaOH used in the calculation will be higher due to the inclusion of the falsely perceived volume of the air bubble.
In summary, the presence of an air bubble in the buret tip during the titration would result in an erroneously high calculated molarity of NaOH solution.