One method that can be used to prove that a solution prepared two weeks ago remains at 1000ppm calcium is through a process called titration.
Here are the steps involved:
1. Obtain a small sample of the solution that was prepared two weeks ago and is believed to contain 1000ppm calcium.
2. Prepare a standardized solution of a known concentration of a calcium-specific titrant. This solution should be accurately prepared and should have a known concentration.
3. Take a measured volume of the sample solution (e.g., 10 mL) and add a few drops of a suitable indicator that changes color when all the calcium ions have reacted.
4. Slowly titrate the standardized calcium titrant solution into the sample solution while continuously stirring. The indicator will change color once all the calcium ions in the sample solution have reacted with the titrant. Make sure to record the volume of titrant solution used.
5. Repeat the titration process using the same sample solution, indicator, and standardized calcium titrant solution several times to ensure accurate and consistent results.
6. Calculate the concentration of calcium in the sample solution using the volume of the standardized calcium titrant solution used and its known concentration.
If the calculated concentration of calcium in the sample solution is still close to 1000ppm, it suggests that the solution has maintained its calcium concentration over the two-week period. However, if the calculated concentration varies significantly from 1000ppm, it indicates that there has been a change in the calcium concentration of the solution during that time.
What method can be used to prove that 1000ppm calcium prepared two weeks ago remains 1000ppm
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