A student failed to notice an air bubble trapped in the tip of the buret during their experiment. What effect does this have on the calculated molarity of the NaOH solution?
M = mols/L
The air bubble makes the buret read a smaller number so a smaller number in the denominator makes a larger M.
Oh dear, looks like the student got a bit "airy" with their experiment! Well, when there's an air bubble trapped in the tip of the buret, it can lead to inaccurate measurements. This means that the volume of NaOH solution added may be actually less than what was recorded. As a result, the calculated molarity of the NaOH solution will be higher than what it actually is. So, remember folks, in the lab, be careful not to blow too many bubbles!
When an air bubble is trapped in the tip of the buret and goes unnoticed, it can have an impact on the calculated molarity of the NaOH solution. The presence of the air bubble can cause a systematic error in volume measurement, leading to inaccurate results.
Normally, during a titration, the buret is filled with a solution of known concentration (the titrant) which is added drop by drop to the analyte solution until a specific endpoint is reached. The volume of titrant required to reach the endpoint is used to calculate the molarity of the analyte solution.
If an air bubble is present in the buret tip, it can displace the liquid, resulting in a smaller observed volume of titrant added. This means that the calculated molarity of the NaOH solution will be lower than it should be because the volume of titrant used will appear less than the actual volume.
To mitigate this issue, it is important to carefully fill and purge the buret to ensure there are no air bubbles trapped in the tip before commencing the titration. If an air bubble is noticed during the experiment, the student should stop the titration, carefully remove the bubble, and then continue with the experiment. This will help to obtain accurate and reliable results for the molarity of the NaOH solution.
When an air bubble is trapped in the tip of a buret during an experiment using a NaOH solution, it can have an impact on the calculated molarity of the solution. The main reason for this is that when the buret is used to deliver NaOH solution, the volume of the bubble will also be included in the volume of the solution measured.
To understand the effect on the calculated molarity, you would need to know the volume of the trapped air bubble. The impact can be analyzed by considering the concentration and volume measurements involved in calculating molarity.
Molarity (M) is defined as the moles of solute divided by the volume of the solution in liters. Mathematically, it can be expressed as:
Molarity (M) = Moles of Solute (n) / Volume of Solution (V)
If an air bubble is trapped in the tip of the buret, it increases the volume of the solution being delivered, resulting in an overestimation of the volume of NaOH solution used. Consequently, the calculated molarity of the NaOH solution will be higher than the actual molarity.
To correct for this error, the volume of the trapped bubble should be subtracted from the total volume measured in the buret to determine the accurate volume of NaOH solution delivered. Once the correct volume is determined, then the molarity calculation can be carried out accurately.
However, if the volume of the trapped air bubble is very small in comparison to the overall volume of the NaOH solution used, its effect on the calculated molarity may be negligible.
It is important to note that thoroughly removing air bubbles from the buret tip is a crucial step in accurate volumetric analysis to avoid such errors in molarity calculations.