Question
A student uses this method to propare a standard solution of sodium carbonate 1. Weigh a clean dry, empty container on a balance that reads to 2 docimal places. 2. Add about 25 gof solid sodium carbonate to the container 3. Tip the solid into a beaker 4. Add approximately 100cm^3 of distilled water to the beaker and stif until all the solid has dissolved. 5. Pour the solution into a 250cm^3 volumetric flask. 6. Add distilled water until the top of the meniscus is level with the graduation mark. Suggest three improvements to this method 13 ma
Answer
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Julia
Professional · Tutor for 6 years
Answer
Three suggested improvements are:1. Weigh sodium carbonate using a scale that reads to at least 3 decimal places. This provides a more precise and accurate mass measurement. 2. Rinse the original beaker used for dissolving the sodium carbonate into the volumetric flask by using some distilled water to ensure all materials the materials transferred. 3. Use volumetric gadgets such as measuring cylinder or another volumetric flask to measure the distilled water, thereby avoiding ambiguities associated with approximation.
Explanation
## Step1: One improvement can be based upon the precision. When weighing sodium carbonate, it would be better to use a balance that can read with even more precision - at least to 3 decimal places, not just 2. This will help to ensure the accuracy of the solution and could affect the overall experiment results. ## Step2: Another improvement is when making up the solution in the volumetric flask. The solution shouldn't just be poured directly into the volumetric flask. It should first be rinsed into contingent flask using distilled water. This removes any remaining sodium carbonate on the original beaker which assures that any it gets transferred along.## Step3:Finally, an improvement can be made with the measure of distilled water. The wording "approximate" means uncertainty which could lead us into calculating erroneous concentrations. It's better suggested that an appropriate volumetric ware that has higher precision like a measuring cylinder or another volumetric flask should be used to measure accurately.