The lab we did was about a silver/copper replacement and about if we know the mole ratios so that we can give an educated guess or a prediction about how much silver/copper we are going to have after the lab.
At the beginning we cut some copper (about 30cm). Then we cleaned it with a plastic sanding pad. We cleaned it so that there is nothing else on it, like dirt. After we've done it we twisted the copper around a pencil so that it looks like a "spring".
After we did that we weighed the copper coil. Its weight was 2.201 grams.
Then we took some silver nitrate and weighed it. Its weight was 1.022 grams. Then we put the silver nitrate in the test tube and covered it with a piece of parafilm so that no liquid could get out of the test tube because we also filled the test tube with distilled water.
Then we shook the test tube so that the silver nitrate and the water balance each other.
After it we removed the parafilm to add the copper wire. Then we put the parafilm on it, again. Then we observed the reaction. The copper wire and the silver nitrate began to react and the copper wire looked kind of green-ish blue-ish. The test tube was also a little bit hot so heat has been released.
We let it stand overnight so it could react completely.
The next day we kept going on with the lab.
At first we took a little filter paper and weighed it. It weighed 1.421 grams.
Then we shook the test tube to get the silver off of the copper wire which is in the test tube. After we're done with this we put a filter paper in a waste beaker so that we could collect all the silver.
Then we opened the test tube and took the copper wire and put it aside. We took the test tube which contained silver and put all this in the filter paper so that we could get rid of the liquid that was in the test tube (mostly distilled water). Then we put some distilled water on the silver in order to clean it completely from everything that could have been on it. After that we put the filter paper with the silver on it somewhere to let it dry overnight because when it has water on it it weighs more than the silver does when it's dry. The next day we weighed the silver and the copper wire. The silver on the filter paper weighed 2.075 grams. The copper wire weighed 2.015 grams.
Then we compared the mass after the reaction and before the reaction. We got 0.644 grams of silver and lost 0.186 grams of copper during the reaction and the lab.
After we had weighed the Silver nitrate in the beginning of the lab we made a prediction about how much silver we will get after the reaction.
To make the prediction you have to: take your amount of silver nitrate in grams(1.022)* 1mol of AgNO3 (silver nitrate) * 2 mol of silver * 1mol of silver in grams (107,869 grams) and divide all this by 1mol in grams of silver nitrate (169,87 grams) * 2mol AgNO3 8 1 mol of silver.
You get the numbers in the middle ( 2mol of silver and 2 mol of Silver nitrate) by looking at the equation of the chemical reaction which is 2AgNO3 + Cu reacts to Cu(NO3)2 + 2 Ag.
If you do so you get a prediction of how many grams of Ag you will Get. Our prediction was that we will get 0.649 grams Ag.
To determine the prediction for copper you do the same procedure but with the numbers of copper instead of Silver Nitrate. The prediction for copper was 0.191 grams.
But after weighing the silver after the reaction we only got 0,644 grams. To determine how many percent you're off you divide the number you got by the number you predicted. Our result matched to 99.23 percent with the prediction so we were only 0.77 percent off.
After weighing the copper we got 0.186 grams. This result matched to 97.38 percent with the prediction. We were 2.26 percent off.
I think that we did a pretty good job because the most we were off was about 2 percent which is very few.
At the beginning we cut some copper (about 30cm). Then we cleaned it with a plastic sanding pad. We cleaned it so that there is nothing else on it, like dirt. After we've done it we twisted the copper around a pencil so that it looks like a "spring".
After we did that we weighed the copper coil. Its weight was 2.201 grams.
Then we took some silver nitrate and weighed it. Its weight was 1.022 grams. Then we put the silver nitrate in the test tube and covered it with a piece of parafilm so that no liquid could get out of the test tube because we also filled the test tube with distilled water.
Then we shook the test tube so that the silver nitrate and the water balance each other.
After it we removed the parafilm to add the copper wire. Then we put the parafilm on it, again. Then we observed the reaction. The copper wire and the silver nitrate began to react and the copper wire looked kind of green-ish blue-ish. The test tube was also a little bit hot so heat has been released.
We let it stand overnight so it could react completely.
The next day we kept going on with the lab.
At first we took a little filter paper and weighed it. It weighed 1.421 grams.
Then we shook the test tube to get the silver off of the copper wire which is in the test tube. After we're done with this we put a filter paper in a waste beaker so that we could collect all the silver.
Then we opened the test tube and took the copper wire and put it aside. We took the test tube which contained silver and put all this in the filter paper so that we could get rid of the liquid that was in the test tube (mostly distilled water). Then we put some distilled water on the silver in order to clean it completely from everything that could have been on it. After that we put the filter paper with the silver on it somewhere to let it dry overnight because when it has water on it it weighs more than the silver does when it's dry. The next day we weighed the silver and the copper wire. The silver on the filter paper weighed 2.075 grams. The copper wire weighed 2.015 grams.
Then we compared the mass after the reaction and before the reaction. We got 0.644 grams of silver and lost 0.186 grams of copper during the reaction and the lab.
After we had weighed the Silver nitrate in the beginning of the lab we made a prediction about how much silver we will get after the reaction.
To make the prediction you have to: take your amount of silver nitrate in grams(1.022)* 1mol of AgNO3 (silver nitrate) * 2 mol of silver * 1mol of silver in grams (107,869 grams) and divide all this by 1mol in grams of silver nitrate (169,87 grams) * 2mol AgNO3 8 1 mol of silver.
You get the numbers in the middle ( 2mol of silver and 2 mol of Silver nitrate) by looking at the equation of the chemical reaction which is 2AgNO3 + Cu reacts to Cu(NO3)2 + 2 Ag.
If you do so you get a prediction of how many grams of Ag you will Get. Our prediction was that we will get 0.649 grams Ag.
To determine the prediction for copper you do the same procedure but with the numbers of copper instead of Silver Nitrate. The prediction for copper was 0.191 grams.
But after weighing the silver after the reaction we only got 0,644 grams. To determine how many percent you're off you divide the number you got by the number you predicted. Our result matched to 99.23 percent with the prediction so we were only 0.77 percent off.
After weighing the copper we got 0.186 grams. This result matched to 97.38 percent with the prediction. We were 2.26 percent off.
I think that we did a pretty good job because the most we were off was about 2 percent which is very few.
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