The reading accuracy of a burette is typically within 0.05 mL. This means that the burette can accurately measure the volume of a liquid to within 0.05 mL. This level of accuracy is important for precise titrations and other laboratory experiments where small volumes of liquid need to be measured. It is important to carefully read and record the volume on the burette to ensure accurate results. **

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Leaving an alkaline solution in the burette for too long can lead to the formation of a white precipitate, which can affect the accuracy of the measurement. This precipitate can coat the walls of the burette and cause the solution to stick to the surface, leading to inaccurate volume readings. Additionally, the presence of the precipitate can also interfere with the reaction being measured, leading to inaccurate results. Therefore, it is important to properly clean and rinse the burette after use to prevent any potential inaccuracies in measurements. **

The formed iodine cannot react with tetrathionate because tetrathionate is a strong reducing agent and iodine is a mild oxidizing agent. In iodometry, the substance to be oxidized is placed in the burette because it allows for precise control over the amount of oxidizing agent added to the solution being analyzed. This ensures accurate determination of the substance being oxidized. **

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The formed iodine cannot react with tetrathionate because tetrathionate is a stronger oxidizing agent than iodine. Tetrathionate will oxidize iodide ions to form iodine, but iodine cannot further react with tetrathionate. The substance to be oxidized is placed in the burette during iodometry because it needs to be slowly added to the iodine solution to ensure that all the iodine is reacted and the endpoint of the titration is accurately determined. **

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