The purpose of this experiment is to determine the pH of known substances by use of a pH color indicator of red cabbage and the use of a pH meter. As well as, to observe the pH changes in a substance by adding in more basic of acidic to buffered solutions and unbuffered solutions. This experiment will also will show how to calculate H3O+, OH- and pH by use of known values. In order to do this lab, there are a few key components one needs to know and understand first.…
After we got the grains measure we then poured them into a 300-400 mL beaker and added 100 mL of distilled water, We then stirred it right away and eventually…
When the liquid is basic, add 3 more NaOH and put the tube in hot water for 3 min. when it is done, put them to tube 10 and add 10 drops NaOH and 10 drops of distilled water to the test tube 4. Put 5 drops water to tube 4. Add H2SO4 to tube 4 until the solution is acidic and check pH. Finally, centrifuge tube 4 and discard the…
Turn on the burner and but a test tube holder on the test tube. Then heat the test tube over the burner back and forth and make sure it is not pointing at anyone. Warm the beaker and observe the color. Let the test tube cool down. Get the hydrate out into the beaker and mass it.…
Use a micro spatula to obtain a sample of sand, and then line a ruler up against the pipet to add 5mm of the sand. Also, tap the pipet to ensure that the sand is compact and has an even top layer. 6. Use the ruler method in step 4, and add 5cm of silica gel to the pipet and tap to ensure there is an even layer. 7.…
By subtracting the mass of the 100 mL beaker from the mass of the beaker and liquid, the mass of the liquid was collected. Lastly, the density of the unknow liquid was found by dividing the volume of the liquid from the mass of the liquid. A small regularly shaped solid and an analytical scale were obtained for part 2 of Lab 4. First,…
The purpose of creating this scientific investigation was to see which type of shoe would kick a soccer ball the furthest. The hypothesis for this project was, “If the type of shoe affects the ball’s distance traveled when kicked, then the cleat will kick the ball the furthest.” The independent variable was the type of shoe. The dependent variable was the distance the ball traveled. The way the responding or dependent variable was measured was the distance the ball has traveled.…
The titration was performed so that the solutions could be neutralized. Titration curves can be used to evaluate the pH when a titrant is added. You can calculate the pH from the curve by first determining how much titrant will be added. You can then evaluate the intersection between that volume and the graph. This intersection will tell you the pH at that volume.…
The 3 methods were calibration plot method, standard addition and standard addition by graphic procedure. The 3 methods are generally good methods to determine the amount of an analyte in sample. But there were a couple huge mistakes made in this experiment. The first was, using a serological pipette instead of volumetric pipettes. Serological pipettes are not as accurate as volumetric pipettes, and will not deliver exactly the same volume as indicated.…
We use various Ph level and different millimeters of pipets to fill up the test tubes according to a table that specified the amount each solution to be put in each test tube. After we have followed the procedures accordingly. We then poured the mixtures into a cuvette, which we later placed into the spectrometer and collected the data. We repeated this process for the rest of the paired tubes and saved the collected data on the desktop which we use for the graph.…
Introduction Density measures the volume that a given amount of mass takes up. Usually, density has grams per unit volume as a unit. To find the density of an object, the object has to be measured and its mass has to be divided by its volume. Often times, density is used to identify substances, since different elements have specific densities. This experiment is made up of two sections; the first section measures the density of water and the density of an unknown substance.…
Determination of the Concentration of Acid in Gastric Juice Introduction Titration is a method where a solution of known concentration is used to find the concentration of an unknown solution. A standard solution is a solution of precisely known concentration. The aim of this experiment was to go over the use of pipettes, burettes, titrations and also to reinforce the concept of molarity.…
There are several different reactions that can be utilized in order to end with a product that includes the synthesis of carbon-carbon bonds, however for this experiment the reaction that was utilized is aldol condensation. An aldol condensation is when an enolizable aldehyde or ketone undergoes a reaction, in the presence of a base or acid, and gives a beta unsaturated ketone or aldehyde (Utah Valley University, 2009). This type of reaction can also add carbonyls to a compound, using similar methods to the Grignard reaction. It is also important to note that in order for this reaction to occur, an alpha hydrogen must be present on one of the reagents (Farmer, 2013).…
The KHP was dissolved with distilled water in an Erlenmeyer flask and two to three drops of the indicator were added. A bottle was filled with the NaOH solution to be used during all titrations in order to standardize and therefore find the concentration of the solution. A clean buret was then filled with a portion of the NaOH solution, allowed to settle from air bubbles, and then dispensed into the flask to titrate the…
The first was determinging the carbonate hardness. I started the experiment with washing the 100 cm3 pipette 2 times with a small amount of the test water. Then I washed the conical flask with distilled water and pipetted into the conical flask 100 cm3 of the test water. After that I added 3 drops of indicator mo or mr. The next step was preparing the burette, hence I removed any air bubbles from the nozzle and filled it with 0,025 M hydrochloric acid till zero (the lower meniscus has to coincide with the scales 0-notation).…