Lab Report Essay

4.) Using a different spatula, place a similar amount of baking soda in wells D,E and F. Again, recording any physical observations you observe.

Procedure 1. Obtain 7 test tubes and stoppers from the instructor. Label each vial L1, L2, L3, D1, D2, D3 and N1. 2. Cut 7 cotton balls in half and place each wad in the bottom of each vial by using the wooden stick to push it down.

First, we filled the beaker with 500 ML of water then dropped 10 drops of the indicator in the beaker. Then we dropped 10 drops of vinegar in the beaker until it turned red. Once this was done we took crushed up Tums and a little bit of water in it mixed

Stirred in .61 ml in beaker 2 & 3. Recorded result beaker 2 low acid .9 cm bubble rise. 3 beaker high acid .3 cm rise. Created base beaker 4 low base & 5 high base. Add 5 ml of the baking soda solution to beaker 4-low base and 10 ml of the baking soda solution to beaker 5- high base.

Next inserting a rubber stopper wit tubing connector into each of the test tubes and into each of the test tubes using a piece of parafilm around the stopper and tubing to fully seal the test tubes. Obtain a 1mL pipette and dip the free end into a tube of colored water and tap the pipette until the water reaches the first marking of the pipette (0.1mL). Then, connect the pipette to the tubing on the rubber stopper, double checking that all tubing connections are secure. After connecting the pipette and tubing together place the pipette horizontally on the ring stand, keeping the pipette leveled. Let it sit for five minutes to equilibrate, this will be used as a zero starting point.

6. Add warm tap water to each test tube, filling each test tube 4/5 of the way to the top. 7. Cover the opening of each test tube with a balloon to catch any gas that is formed. Using the balloon to seal the end of the tests tube, hold a finger over the end of each test tube and shake it vigorously to thoroughly mix the contents.

Pour 5 mL of water into the graduated cylinder. Weigh and record the mass of the cylinder and water.

11. Remove test tube from water bath. Turn off the hot plate and allow it to cool. 12. Place test tube in room temperature water.

2. Measure 5mL of a solvent (water) and pour into different test tubes 6 times using a measuring cylinder.

Put 0.25 g of baking soda in the erlenmeyer flask with 20 mL of distilled water and add drops of bromothymol blue (as many as it takes to make the solution blue). Fill the burette with HCL and record the starting point. Then titrate the solution until it turns a light yellow and stays. Lightly shake the solution while titrating it. In the experiment it may be helpful to use pH strips to see when the solution is done.

The experiment was mixing the compounds; baking soda and vinegar. Gathering all the materials and measurement of the beaker to use your basic stoichiometry to find other numbers and the percent error. Firstly, you had to have a beaker with 5 grams of baking soda. The baking soda will be weighed to get the most exact amount; which is 5 grams. Once again, before placing the baking soda into the beaker you first have to measure the weight of the beaker: the baking soda should be placed in the beaker ready for the vinegar. The vinegar should be 25 milliliters: you would measure this by using your graduated cylinder. Slowly pouring in the vinegar, with the dropper, there should be bubbles forming as you put vinegar inside the beaker. The bubbles

Trial 2 corrects the errors in trial 1 with letting less grams dropped or stuck to the paper cup having 3.13 grams after the first trial and 3.13 grams the second trial. The first 15 minutes were used for the calculations since they do not include the error of dropping the sodium bicarbonate. The experiment did not have any limited resources. The main way to improve this lab is possibly to have a method to measure the mass of the solid yield without having to transfer it through 2 containers, such as having a way to measure the gas instead or having a vertical spring scale holding it upwards measuring the crucible and the solid as it is being heated. About all the other groups that participating in data collection for this lab agreed that the final equation would be equation 2 as they yielded similar percentage yields (falling within

3.) Measure the mass of the first substance (0.25g) on the balance scale accurately. Once measured add the substance into the boiling tube containing 20ml of water and make sure the thermometer is still in the boiling

• Obtain a ring stand and a thermometer. Secure the thermometer to the ring stand (consider precautions if a glass thermometer is utilized). • Acquire a 250 mL beaker and a dry 200-mm test tube. • Place the test tube inside the beaker and record the mass of the beaker and the test tube together as shown in figure 14.5. • Obtain 12 mL of cyclohexane (solvent) and add it to the test tube (use safety precautions as cyclohexane is an irritant and highly flammable).

6. Add 5.0 cm3 of distilled water from a beaker to each of the seven test tubes E25 to E75 and C25. Put all seven test tubes into the water bath.