The purpose of the experiment was to find which balanced chemical equation best represents the thermal decomposition of sodium bicarbonate, or baking soda (NaHCO3). The lab presented us with four possible equations but there was no way of determining which equation was correct unless we performed an experiment and using the law of conservation of mass which says that mass is conserved during a chemical reaction, the law of definite proportions which says that a compound is always made of the same proportion of elements by mass, and stoichiometry to properly balance the equation. The first part of the experiment was to measure an amount of baking soda to start out with. For the first and second time we performed the experiment we used 1 g of …show more content…
The crucible itself weighed 22.04 g so together the baking soda and crucible weighted 23.04 g at the beginning. At the first weigh-in, after two minutes over the fire, the cup and powder weighed 22.67 g, meaning that something had occurred and the weight of the powder had decreased to .63 g. We placed the crucible back onto the fire and waited another two minutes to see if it had already stabilized or if we had to wait a bit longer for that to happen. At the second and third weigh-ins the weight had not changed much at all, only .02 g and .01 g, respectively. Decidedly, nothing much had changed, so we finished the experiment then, meaning .38 g of sodium bicarbonate had been lost in the reaction. The stoichiometry we did showed us that the first reaction of sodium bicarbonate decomposing into sodium hydroxide and carbon dioxide was the correct equation, because our math showed us that we should be left with about the same amount of the product as we were left with when we performed the experiment. The second and third times we did the experiment gave us the same results, even though we left the cup over the fire for five minutes instead of two, and for the third time we used a larger amount of baking soda to see if it gave us a different outcome (we left it on for five minutes again, but we still got the same result as the previous two
The mixture was poured through a weight filter paper and Sucrose washed with a 5ml of dichloromethane. The resulting solid was left in a breaker to dry for one week, to be measured. Left it in the drawer to dry out for a week and weighted it to find the sucrose amount recovered amount.
The question I was trying to answer is Which balanced chemical equation best represents the thermal decomposition of sodium bicarbonate. Using that question to guide us we were trying to determine which of the four chemical equations show how atoms are rearranged during thermal decomposition. We concluded it was the second chemical equation, we know that because:
2. A test tube was then filled with 35ml of yeast and placed in the
Each subsequent trial will use one gram more. 2.Put baking soda into reaction vessel. 3.Measure 40 mL vinegar. 4.Completely fill 1000 mL graduated cylinder with water.
One of the best methods for determining mass in chemistry is gravimetric analysis (Lab Handout). It is essentially using the the mass of the product to figure out the original mass that we are looking for. Thus the purpose of our experiment was to compare the final mass in our reaction to the initial mass and determine the change in mass.
In this experiment, there were several objectives. First, this lab was designed to determine the difference, if any, between the densities of Coke and Diet Coke. It was designed to evaluate the accuracy and precision of several lab equipment measurements. This lab was also designed to be an introduction to the LabQuest Data and the Logger Pro data analysis database. Random, systematic, and gross errors are errors made during experiments that can have significant effects to the results. Random errors do not really have a specific cause, but still causes a few of the measurements to either be a little high or a little low. Systematic errors occur when there are limitations or mistakes on lab equipment or lab procedures. These kinds of errors cause measurements to be either be always high or always low. The last kind of error is gross errors. Gross errors occur when machines or equipment fail completely. However, gross errors usually occur due to a personal mistake. For this experiment, the number of significant figures is very important and depends on the equipment being used. When using the volumetric pipette and burette, the measurements are rounded to the hundredth place while in a graduated cylinder, it is rounded to the tenth place.
6. Heat the crucible and its content with the lid off until the magnesium begins to glow
One possible source of experimental error could be not having a solid measurement of magnesium hydroxide nor citric acid. This is because we were told to measure out between 5.6g-5.8g for magnesium hydroxide and 14g-21g for citric acid. If accuracy measures how closely a measured value is to the accepted value and or true value, then accuracy may not have been an aspect that was achieved in this lab. Therefore, not having a solid precise measurement and accurate measurement was another source of experimental error.
Based on your experiments what is the formula of the colorless gas that is released when heating the malachite?
Even before i have done the experiment, I am in a position to make a
* The experiment was also lmited by the accuracy of the top pan balance, which showed mass in grams to one decimal place.
In this experiment, the question “What is the effect of the viscosity of honey in a honey tube (85%-100%) on the final
We did a pre-test in the same way in which the experiment is to be
Investigating How the Concentration of Hydrochloric Acid Affects the Rate of Reaction with Calcium Carbonate
Write a summary about the results that you got from this experiment. You will notice that the results are not the same, there is a slight difference.