1. Give one possible error you could have made in carrying out the experiment (not a calculation error) that would cause your.

a) %NaCl to be too small
b) %SiO2 to be too large
2. Solubilities of Compounds A, B and C were determined and summarized in the following table:
cold water hot water
A insoluble soluble
B insoluble insoluble
C soluble soluble

a) Describe the process you would use to separate compounds A and B if both compounds were present in a mixture.

b) If compounds A and C were present in a mixture, could they be separated using hot water? Why or why not?

c) Circle the correct Compound (A,B, or C) for each consecutive step and give reasons for your answers.
You have a mixture of the 3 compounds above, A, B and C.

1) You add hot water to the mixture and filter: Which one? A, B, C remains on the filter paper.

2) You chill the solution that passed through the filter paper and filter again: Which one? A, B, C remains on the filter paper.

3) You evaporate the water from the solution in the beaker and Which one? A, B, C remains in the beaker.

I'm terribly sorry but my crystal ball isn't working today. I have no idea what experiment you did and I have no idea what procedure you followed which led to those questions. I think there is enough info to do #2.

2.
A insoluble cold; soluble hot
B insoluble cold; insoluble hot
C soluble cold; soluble hot.
(a) For mixture of A and B, add hot water, stir, filter. B will be in the filtrate and A will be in the filter paper.
(b) For mixture of A and C. Yes, they can be separated. Add cold water, stir, filter. C is in the filtrate. A is in the filter paper.
You get the idea how to do it.
(1) Add hot water to mixture of A, B, C. The only one insoluble in hot water is B; therefore, A and C will be in the filtrate and B will be on the filter paper.
(2) Mixture of A and C in the filtrate and redo in cold water. A is insoluble and will be on the filter paper. C is soluble and will be in the filtrate.
(3) I'll leave this one for you.

1. a) One possible error that could cause the %NaCl to be too small is not fully dissolving the salt in the solvent before taking measurements or calculations. It would be like trying to find a needle in a haystack, except the needle is invisible and the haystack tastes really salty.

b) One possible error that could cause the %SiO2 to be too large is contamination from other sources of silica during the experiment. It's like trying to count the number of cats in a room, but every time you attempt it, a cat statue magically appears out of nowhere. So you end up with more cats than there actually are. Silly cat statues.

2. a) To separate compounds A and B from a mixture, you could use a process called filtration. You would pour the mixture into a filter paper, and since compound A is soluble in hot water, it would pass through the filter while compound B, being insoluble in both cold and hot water, would remain on the filter paper. It's like separating spaghetti from meatballs by draining the pasta through a colander.

b) If compounds A and C were present in a mixture, they could not be easily separated using hot water alone. Both compounds are soluble in hot water, so they will both pass through the filter during filtration. It's like trying to catch two slippery fish in a net - they both just slip right through.

c) 1) When you add hot water to the mixture and filter, compound C would remain on the filter paper. Compound C is soluble in hot water, so it would dissolve and pass through the filter, while compounds A and B, being insoluble or only soluble in cold water, would remain on the filter paper.

2) When you chill the solution that passed through the filter paper and filter again, compound C would again remain on the filter paper. Since compound C is soluble in both hot and cold water, it would remain on the filter paper during both filtrations, while compounds A and B, being insoluble or only soluble in hot water, would pass through the filter.

3) When you evaporate the water from the solution in the beaker, compound A would remain in the beaker. Compound A is insoluble in both cold and hot water, so it would not evaporate with the water and would be left behind in the beaker, while compounds B and C, being soluble, would be gone with the water. It's like leaving behind a stubborn stain while the rest of the liquid evaporates.

1. Possible errors in carrying out the experiment that could cause the %NaCl to be too small:

a) Insufficient salt added: If you did not add enough salt to the solution, the concentration of NaCl would be lower than expected, resulting in a smaller percentage.
b) Leakage or evaporation: If the container used to hold the solution had leakage or if there was significant evaporation during the experiment, it could lead to a decrease in the amount of NaCl present, leading to a smaller percentage.

2. Possible errors in carrying out the experiment that could cause the %SiO2 to be too large:

a) Contamination: If there is any impurity or foreign substance present in the sample that adds to the weight measured, it would result in a higher recorded amount of SiO2 and, subsequently, a larger percentage.
b) Incomplete drying: If the sample was not dried properly before measurement, there could be residual water content that contributes to the weight, leading to a higher recorded amount of SiO2.

a) To separate compounds A and B if both compounds were present in a mixture, you could use a solvent extraction process. One possible method is to dissolve the mixture in a suitable solvent that selectively dissolves compound B but leaves compound A behind. Then, filter the solution to separate the solid compound A from the liquid solution. Finally, evaporate the solvent to obtain pure compound B.

b) If compounds A and C were present in a mixture, they could be separated using hot water. Hot water can dissolve both compounds A and C, but the solubility of compound A decreases significantly as the solution cools down. By chilling the solution, compound A would precipitate out while compound C remains in the solution. Then, filtration can be used to separate compound A from the mixture.

c) Steps to separate the compounds A, B, and C in the given mixture:

1) You add hot water to the mixture and filter: Compound C remains in the solution, as it is soluble in hot water. Compounds A and B remain on the filter paper.

2) You chill the solution that passed through the filter paper and filter again: Compound B remains in the solution, as it is insoluble in cold water. Compound A remains on the filter paper.

3) You evaporate the water from the solution in the beaker: Compound C remains in the beaker, as it is soluble. Compound A remains in the beaker, as it doesn't dissolve in water. Thus, the compound left in the beaker is a mix of A and C. Compound B has been removed during the previous steps.