if the final burette reading 28.45mL and the initial burette reading id 5.60mL,what is the titer?
The correct answer and explanation is:
To calculate the titer (volume of solution delivered) in a titration, you subtract the initial burette reading from the final burette reading: Titer=Final burette reading−Initial burette reading\text{Titer} = \text{Final burette reading} – \text{Initial burette reading}
Given:
- Final burette reading = 28.45 mL
- Initial burette reading = 5.60 mL
Titer=28.45 mL−5.60 mL=22.85 mL\text{Titer} = 28.45\, \text{mL} – 5.60\, \text{mL} = \boxed{22.85\, \text{mL}}
Explanation (300 words):
In volumetric analysis, a burette is used to accurately measure the volume of a solution (usually a titrant) that has been added during a titration. The titer refers to the volume of the titrant dispensed from the burette to reach the endpoint of the reaction, which is typically indicated by a color change due to an indicator.
To determine this, one must subtract the initial burette reading (before titration begins) from the final burette reading (when the reaction reaches its endpoint). The result gives the net volume of liquid delivered.
In this case, the initial burette reading was 5.60 mL, and after the titration, the final burette reading was 28.45 mL. Subtracting these values gives the titer of 22.85 mL, which is the volume of the titrant used to completely react with the analyte in the flask.
This step is crucial because it ensures accuracy and precision in determining the concentration of an unknown solution. Small errors in reading the burette can lead to significant inaccuracies, especially when calculating molarity using the titration formula: M1V1=M2V2M_1V_1 = M_2V_2
Where MM is molarity and VV is volume. Therefore, recording the burette readings carefully is essential. It is also standard practice to take multiple titration readings and average the consistent ones (within ±0.10 mL) for reliability.
In summary, the correct titer in this case is 22.85 mL, which is the accurate volume of titrant used during the titration process.