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
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.
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:
Compress the safety bulb, hold it firmly against the end of the pipette. Then release the bulb and allow it to draw the liquid into the pipette.
2. A test tube was then filled with 35ml of yeast and placed in the
Investigating How the Concentration of Hydrochloric Acid Affects the Rate of Reaction with Calcium Carbonate
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.
Even before i have done the experiment, I am in a position to make a
" This means that therefore the enthalpy change of a reaction can be measured by the calculation of 2 other reactions which relate directly to the reactants used in the first reaction and provided the same reaction conditions are used, the results will not be affected. We have the problem set by the experiment to determine the enthalpy change of the thermal decomposition of calcium carbonate. This is difficult because we cannot accurately measure how much thermal energy is taken from the surroundings and provided via thermal energy from a Bunsen flame into the reactants, due to its endothermic nature. Therefore, using the enthalpy changes obtained in reaction 1 and reaction 2 we can set up a Hess cycle.
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.
In this experiment, the question “What is the effect of the viscosity of honey in a honey tube (85%-100%) on the final
* The experiment was also lmited by the accuracy of the top pan balance, which showed mass in grams to one decimal place.
We did a pre-test in the same way in which the experiment is to be
As the reaction was taking place, the water in the measuring cylinder was being displaced – indicating that the calcium carbonate (in the form of marble chips) was displacing the hydrogen in the hydrochloric acid.
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.
Based on your experiments what is the formula of the colorless gas that is released when heating the malachite?