Separation of a mixture Lab - SiO2, NaCl, NH4Cl
So step #7 was: Carefully pour off (decant) the liquid into the second evaporation dish, Adding deionized water in small amounts to the first dish and to stir it, and pour the liquid again into the second dish. Repeating it.
The question I'm having trouble with is, Suppose that not all of the NaCl dissolved in the water, explain this error would affect your reported percent of :
NH4Cl
NaCl
SiO2
I don't know enough about how you separated this mixture to answer. I may be able to help if you type in the entire procedure.
If not all of the NaCl dissolved in the water during the step described, it would have an impact on the reported percent of each component in the mixture (NH4Cl, NaCl, and SiO2). Let's examine this error and its effects on each component individually:
1. NH4Cl: Since NH4Cl is soluble in water, if some NaCl remains undissolved, it might incorrectly appear as NH4Cl in the final product. This would lead to an overestimation of the percent of NH4Cl in the mixture.
2. NaCl: If not all of the NaCl dissolved in water, the undissolved NaCl would remain in the solid form in the mixture. This would result in an overestimation of the percent of NaCl in the mixture since the undissolved NaCl would be included in the calculated mass of NaCl.
3. SiO2: SiO2 is insoluble in water. Therefore, if some NaCl remains undissolved, it would not affect the percent of SiO2 in the mixture since SiO2 does not interact with water.
In summary, the error of incomplete dissolution of NaCl in water would likely affect the reported percent of NH4Cl and NaCl in the mixture, resulting in an overestimation of their values. The error would not affect the reported percent of SiO2.
If not all of the NaCl dissolved in the water during the process described in step #7 of the separation of mixture lab, it would affect the reported percent of NH4Cl, NaCl, and SiO2. Here's an explanation of how this error would impact each component:
1. NH4Cl: Since NH4Cl is soluble in water, if there is NaCl remaining undissolved, it may cause some NH4Cl molecules to remain trapped or mixed with the remaining NaCl. As a result, when the liquid is poured into the second evaporation dish, some NH4Cl may be lost with the undissolved NaCl. This loss of NH4Cl would lead to an underestimation of the reported percent of NH4Cl.
2. NaCl: If not all of the NaCl dissolved in water, there will be some undissolved NaCl particles present. These undissolved particles would appear as solid residue in the first evaporation dish. As the liquid is poured into the second dish, the undissolved NaCl particles may also transfer into the second dish along with the liquid. This would lead to an overestimation of the reported percent of NaCl since there would be more NaCl present than actually dissolved.
3. SiO2 (silicon dioxide): Unlike NH4Cl and NaCl, SiO2 is insoluble in water. Therefore, the presence of undissolved NaCl would not directly impact the reported percent of SiO2. However, if the undissolved NaCl particles mingle with the SiO2 particles during stirring or pouring, it may cause some SiO2 to become contaminated. This contamination could affect the reported percent of SiO2, as it would contain traces of NaCl.
To minimize this error, it is important to ensure thorough dissolution of all soluble components, such as NaCl, by using sufficient agitation and allowing enough time for the particles to dissolve completely. Proper filtering techniques can also be employed to separate the undissolved particles effectively before transferring the liquid to the second evaporation dish.