A student found that her mixture was 15% NH4Cl, 20% NaCl, and 75% SiO2. Assuming her calculations are correct, what is the most likely source or error in her experiment?
To determine the most likely source of error in the student's experiment, we need to consider the percentage values reported for each component of the mixture.
The sum of the percentages of NH4Cl, NaCl, and SiO2 in the mixture should add up to 100%, representing the entire composition of the sample. However, in this case, the sum of the percentages is 15% + 20% + 75% = 110%. This indicates that the student's calculations are not correct and there is an error in the experiment.
The most likely source of error can be attributed to inaccurate measurements or calculations during the preparation of the mixture. It is possible that the student made a mistake while weighing or measuring the individual components before mixing them. Alternatively, errors in calculation could occur during the determination of the percentage composition.
To rectify this error, the student should carefully check the measurements and calculations performed during the experiment. They should double-check the accuracy of the weights of each component used to prepare the mixture. Furthermore, the student should review the methods used to calculate the percentages for each component, ensuring that the calculations are performed correctly.