# Room Temperature Lab

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Method/Procedure IV: Change in temperature Room Temperature (control) 30oC 40oC x3 x3 x3 DV: Speed of the chemical reaction between solid calcium carbonate and solution of hydrochloric acid C: Room temperature (23oC) Mass of calcium carbonate (5.0g) Concentration of hydrochloric acid (6.0M) Amount of hydrochloric acid (20ml) Time for chemical reaction (360sec) Prepare solid calcium carbonate (5.0g for each trial), solution of hydrochloric acid (6.0M of 20ml for each trial), a pressure sensor, Lab Quest mini, temperature sensor, hot plate, a rubber stopper, and a Erlenmeyer flask. Measure 20 ml of hydrochloric acid and pour into the Erlenmeyer flask. Measure the required temperature (room temperature, 30oC, or 40oC) by heating up the solvent…show more content…
Do for each of the temperatures, and calculate the rate of change in pressure (in atm) over 360 seconds. * Rate of reaction was measured by dividing the change in pressure (atm) by the change in temperature. This method allowed to calculate an accurate measurement of the rate of change because pressure have directly proportional relationship with rate of change; therefore, we used pressure to determine the rate of change. (e.g. higher pressure → more collision → faster rate of change) *By examining the change in pressure over 360 seconds, we collected data until the change in pressure was…show more content…
According to the graph above, as the temperature increased, the rate of reaction also increased. The trend in the graph suggested a directly proportional relationship between temperature and rate of change. At room temperature, the mean of the rate of reaction was 0.020. At 30oC, the mean of the rate of reaction was 0.050. At 40oC, the mean of the rate of reaction was 0.078. Therefore, the graph proved the direct relationship between temperature and rate of reaction. Furthermore, the mean and the median of each trial consequently proved the directly proportional relationship between temperature and rate of change. The mean and the median of the results for each trial differed by a little; thus we were able to clearly represent the difference between rate of change for each temperature, and were able to come up with a precise set of data. Our data also answers the question: how does changing variables relating to solid calcium carbonate (CaCO3) and a solution of hydrochloric acid (HCl) affect the speed of the chemical reaction between the two reactants? By considering the variable ‘temperature’, we concluded that changing variables affect the rate of change in the chemical reaction between calcium carbonate and hydrochloric acid. The change in temperature affected the rate of change because trial 1, trial 2, and trial 3, each with