Na2co3 Synthesis Lab Report

Mole of chlorine : 1.0217g - .221g - .3946 g = .4061 g of chlorine

There are several sources of error to this experiment due to random and systematic errors. The only source of random error was the measurement that we took through the graduated cylinder which was only accurate to the nearest 1%. We took the largest error from this one percent, which was +/- 3. The largest relative error this yielded was only 3%, so this did not affect how precise this experiment was too much. We can still make this more precise by making the masses of the water larger. For example if we started the masses at 300mL and went up by 50mL, the largest error this would yield would be 2% due to the largest error being +/- 5. This would cause smaller errors in the amount of water.

For the Mole lab, my team claimed there was 1,992 beans in the large display jar. The estimate was close but still off by 59 beans. The actual amount of beans in the jar was 2,051. To figure out our estimate we used a beaker of beans to experiment with. We first found the tare weight of the beaker, which was 49.912, and the weight of the beaker with the beans, 95.301. Our next step was the weight ten beans of different sizes and find the average of the beans. We found the average weight of the beans to be .47g. After doing this we then subtracted the weight of beaker with the beans from the tare weight to find the weight of the beans. We found the weight of the beans to be 45.389g. After finding the weight of the beans we dived that by he average weight of our ten beans and got 97 beans in our beaker. When we counted our beans in our beaker, we found it to be 105. We then repeated this test but using the tare

3. When the anhydrous sample was rehydrated, only 93.4% of the sample could be recovered. This was because some of the mass of the sample remained stuck to the filter paper and could not be measured in the final mass calculation. This automatically resulted in less mass and did not allow for 100% of the mass to be recovered.

The cup with the second greatest change in mass of the rock was number 2. Cup 2 had the solution of 10% vinegar and resulted in the change of -0.3g. Lastly, Cup 3 with distilled water had the lowest change in the mass of the rock, of 0g. It was hypothesized at the beginning that Cup 3 with distilled water would have the least amount of change, if any. This hypothesis was correct. Water is not acidic, so there would be no reason for the rock to change. When the hypothesis was conducted, it was based on the pH level. Instead, the actual solution should have been taken into consideration. The fact that the soda water would eventually lose its carbonation and become flat within a few days. Therefore, taking the acidity away. The experiment was done correctly, and there did not need to be any changes. Just the hypothesis could have been more thoroughly

I then measured out 100ml of soil and then I poured beaker number one through the funnel and let it filter down into beaker number five. I repeated the process with beakers two through four pouring them into beakers six through eight. When completed I let the filtration complete before making my observation. Here are my results.

The purpose of this lab was to find out how gaviscon reacted with different salt solutions. Sodium Alginate is a compound that forms with the Gaviscon and forms a “raft” and blocks all the stomach acid from traveling up the esophagus.

When compared to the theoretical value, we had a 2.6% error in our experiment. Any errors that occurred maybe due to a too low intensity

Write down three sources of experimental error and explain how each one might have affected your final calculated molar mass.

Turning to over-the-counter drugs has become a necessity for those seeking fast and easy pain relief. Several medications have been noted as beneficial and effective, and although Alka-Seltzer tablets, used for pain relief, as an antihistamine, and for nasal decongestion, has not reached the most commonly used, its effectiveness can be proven.2 Dissolved in water before ingestion, Alka-Seltzer tablets use the action of effervescence to produce the release of carbon dioxide gas.1 This release of gas allows for the fizz to occur, and for excess sodium bicarbonate to aid in the pain relief, in combination with aspirin in the tablets.1,2 But, this need for pain relief from over-the-counter drugs has been monitored due to the

The pure product has a lower product yield than the crude. Since the pure product had to go through similar steps as the crude product, there could have been similar sources of errors as the crude. Also, the process of recrystallization removes impurities. Therefore, the impurities that were originally in the substance will be subtracted away from the original mass, only leaving the pure product. Lastly, during the process of weighing the final pure product, the filter paper was not involved in the measurement, unlike the crude product. After the filtration,

After we did the measurements, we found that an old penny weighs about 2.50g while a new penny weighs about 3.09g. Lastly, an empty vial weighs about 4.95g.

One of the errors that may have occurred was that the dialysis bags may not have been completely dried from the distilled water before the initial and the final masses were taken and recorded, which could have affected the mass difference and consequently the percent change in mass. Another error that could have occurred was if the dialysis bags were not completely sealed when the tails of

By using Eq (4.4) we can calculate for a [a= m/M+m * g, a = (20 g /(283.2 g + 20 g)) * 9.81 m/s2= 0.646 m/s2]. The value of a (a= 0.5067 m/s2 +/- 0.01709 m/s2) we calculated for is not consistent with the expected value of 0.646 m/s2. As stated before, the probably cause of the inconsistency is the slight discrepancy during the experiment.

1. Step six in the procedure is necessary because there maybe some left over solution left over in the filter and so we use the water to get rid of that excess solution which is leftover. Step six is also important because this 5 mL of water could make the left over precipitate release excess water in it making it so that the drying process is quicker.