Lab_Report

Lab Report As we flip the eudiometer upside down, the acid from the bottom of the eudiometer floats through the top which reacts with the Magnesium strip. We could see bubbles around the area where the Magnesium strip is dissolving. After a minute at most, the Magnesium strip has completely disappeared. I took several steps to complete the lab. First I fill up both of the beakers with water. Second, using the small graduated cylinder, I got 5mL of concentrated HCl and I poured that into the eudiometer. Third I slowly poured water into the eudiometer with the acid already, we do not want to acid to mix up with the water. Fourth I rolled the Magnesium strip into a loose coil like a cork screw and run a piece of string through it, I clammed one end of the Magnesium so that the strip would hold onto the string. Next, I lowered the coiled Magnesium strip into the eudiometer; I only put it about an inch down the eudiometer, the left over string I rolled it up into a “plug” and pushed it into the eudiometer opening. Then, carefully I flipped the eudiometer upside down while holding the “plug” with my thumb to prevent water from flowing out and put it into the large beaker, and then I remove my thumb from the plug. After the reaction I took the temperature of the water in the large beaker. Finally, using my hand to press on the plug, I removed the eudiometer from the beaker and then put in the larger beaker to get the volume; I had to line the water level the eudiometer with the water level in the large beaker. For number two I wanted to find how many moles of H2 were there during the reaction. I used the mass of the Magnesium strip and converted that to mole of Magnesium. Finally I multiplied that with the moles of H2 exist in the balanced formula. For number three I wanted to find how many moles of H2 were there. I used the number of pressure of H2 that was there, the temperature of the water that the reaction took place in and the universal gas constant number. I had to convert the pressure from mmHg to ATM, and the volume from mL to L and the temperature from C to Kelvin. I had to do these conversions because it is required in order for the equation to be calculated accurately. I used the ideal gas law to find the mole of H2 by dividing PxV with RxT I was able to get the amount of H2 in the reaction. The percentage yield tells us whether the experiment was accurate or not. We go a 97% from the experiment which was accurate. The percents yield is obtain by using the conversion of Mg into mol of H2 and uses that number to divide with the number we got from using PV=nTR and then times it by 100 in order to convert it to a percent.