Lagging indicator

The purpose of this lab is to determine the Ka of an indicator within an unknown solution. This can be determined because acid-base indicators are weak bases or acids, and when neutralized they change colors. The color change is measured by the light absorption spectra in the compound which can be used to calculate the concentration. This experiment measures the concentrations by the different pH values which allows the pKa and Ka to be determined. Through the experiment, and the recorded color…

In the biomolecule lab, we conducted the lipid chromatography experiment to separate a mixture of biomolecules from lipids. If a positive test is conducted by the end of the experiment, there should be smudges aligned vertically on the chromatography paper, or silica gel strip, indicating the separation of different lipid molecules that were present in the substance. In contrast, if a negative test is conducted there would be no smudges aligned vertically on the chromatography paper. Substances…

litmus paper will demonstrate that a solution contains an acid. However, if the solution contains a base the paper will turn blue, and if it turns red the solution is an acid. Also, like the litmus paper, Multip-pH is a paper impregnated with an indicator solution. The paper is dipped in the solution and is matched with a pH color chart. Furthermore, if both pink and blue litmus paper fail to change color, than the solution is neutral. An example of a neutral solution would be distilled water,…

PH levels are a measure of how acidic or basic your beverage is. They show what beverages are more acidic, like soda, and what beverages are more basic, like water. It’s measured on a scale from one to fourteen. One through six are the acid levels, seven is the only neutral level, and eight through fourteen are the basic levels. First, get 2 drinks of choice and pour them into two different cups. Then, record its pH level, as well as the room temperature. Next, take another liquid and mix it…

an unknown solution (analyte), titrant is used for identifying the concentration of that unknown by adding titrant to analyte. (using burette) Acid –base indicator: acid- base indicator is an indicator that determines the pH of a solution by changing its color due to H+ ion concentrations inside the solution. Indicator range: acid- base indicators change their colors when pH changes. However, they are useful in a specific pH interval. pH of a solution cannot be determined if pH is out of the…

1. The first part of the second experiment went according to the alternative hypothesis. The 200% saline water moved below the 100% saline water to create a layer. It did not mix with the 100% saline water or tap water. On the other hand, the second part of the second experiment did not support the alternative. Instead of moving above the 100% and 200% saline water and tap water, the 35% saline water remained at the bottom. However, it did try to move up. The reason the 35% saline water did not…

they make contact with acidic acid. Being that they become extremely reactive with the acidic acid, forming consecutively larger bubbles until the solute (being Sodium bicarbonate) had completely dissolved in the acidic acid. Using the universal indicator it can be observed that the Unknown substance or Sodium bicarbonate had both became a chunky paste, which turns into a dark green colour which signifies that it is a moderately neutral-weak acid. Finally, when comparing the Unknown substance…

After thymol blue was added, the pH-buffered samples developed the colors of red, yellow, green, and blue as the pH of the solutions increased (Figure 3.1A). The pH-2 buffer turned to a light red-pink color, while pH-3 to pH-6 displayed very similar forms of rich yellow or light orange (Figure 3.1A). The neutral pH buffer solution appeared as a saffron green colored solution (Figure 3.1A). A mixture of yellow and green was apparent in the dijon color of the pH-8 buffer (Figure 3.1A). The buffer…

For the following lab, the purpose is to utilize titration to determine the amount of ascorbic acid (vitamin C) present in a substance by reacting it with potassium bromate. An oxidation reaction takes place with ascorbic acid to produce dehydroascorbic acid, using an excess of bromine. The total amount of bromine utilized during the experiment is determined utilizing a back titration, in which the bromine is reacted with bromate. One mole of bromate produces three moles of bromine and the…

the acid detergent fibre which is a measurement of lingin, cellulose and lignified nitrogen is 306.79 (g/kg DM). The neutral detergent fibre of the silage was 552.40(g/kg DM) and is an indicator of forage intake potential which declines as NDF value increases. The pH value of the silage is 3.91 and its an indicator of the acid in the silage.…