Cabbage Patch Lab
In this week’s lab, I had to determine the pH of several liquids. My question was “How acidic or basic are each of the liquids?”. Indicators are compounds that change color at a specific pH level when added to a substance. The indicators I used in this lab were cabbage juice and litmus paper. Now that I have a question and background information, I can move on to form a hypothesis.
I had 5 different hypotheses for each of the liquids. If I dip the litmus paper in the distilled water, then it will be neutral. If I dip the litmus paper in the vinegar, then it will be an acid. If I dip the litmus paper in the apple cider vinegar, then it will be an acid. If I dip the litmus paper in the laundry detergent then it will be a base. And finally, if I dip the litmus paper in lime juice, then it will be a base.
There is an independent and dependent variable, a control group, and a constant in every lab. The independent variable in this lab is the color of the liquids. The dependent variable is the the pH. The control group is the cabbage juice,
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and the constant is the amount of liquid there was and the amount of cabbage juice I added to the different liquids. There were several materials I used and several steps I had to follow.
The materials I used in this lab were red cabbage juice, red and blue litmus paper, measuring cups, a paper towel, distilled water, vinegar, apple cider vinegar, laundry detergent, lime juice, a pH chart, and finally, a dropper. The first step in this lab report is to take one drop of cabbage juice from the measuring cup and put it into the other measuring cups, or the other 5 liquids, and mix the solution together. Next, using the pH chart, decide the color of the solution and record the results. Third, dip the red and blue litmus paper into all of the measuring cups and place them on a paper towel to determine whether each substance is an acid or base using the pH scale. And finally, record all your results in the data chart putting the number each solution is under “pH”, and putting acidic, basic, or neutral under “effect on litmus
paper” The chart above shows my results. The pH of the vinegar and the apple cider vinegar was 2. The pH of the lime juice was 1. The pH of the laundry detergent was 12. The pH of the distilled water was 7. The color of the distilled water and the vinegar was clear with the indicator, the cabbage juice. The color of the apple cider vinegar with the indicator was yellow. The color of the laundry detergent changed with the indicator going from blue to a green. The color of the lime juice with the cabbage juice changed as well, going from a yellow to an orange. Most of my hypothesis was correct. I predicted that the vinegar and the apple cider vinegar will be acids, which was right. I predicted the distilled water would be neutral, which I also proved right. I predicted the laundry detergent to be a base, which was correct,. The only hypothesis I got incorrect was I predicted the lime juice would be a base, but it was actually an acid. This was an interesting lab to perform. Getting to see the color of the litmus paper and the color of the liquids change was really cool. One thing I learned performing this lab was that cabbage juice is an indicator. In conclusion, this was an interesting lab to perform and I hope we do another lab like this again.
Data table 1 Well plate Contents Glucose concentration A 3 drops 5% sucrose + 3 drops distilled water Negative B 3 drops milk+3 drops distilled water Negative C 3 drops 5% sucrose +3 drops lactase Negative D 3 drops milk +3 drops lactase 15+ E 3 drops 20% glucose +3 drops distilled water 110 ++ Questions B. In this exercise, five reactions were performed. Of those reactions, two were negative controls and one was a positive control.
...ost likely to be battery acid. If it is water, it has a Ph level of around 7. For vinegar, the Ph level is approximately 2.4 - 3.4. Thus, once testing the liquid compare it with the Ph levels above to discover the mystery solution.
For this experiment, you will add the measured amount of the first sample to the measured amount of the second sample into its respectively labeled test tube then observe if a reaction occurs. In your Data Table, record the samples added to each test tube, describe the reaction observed, if any, and whether or not a chemical reaction took place.
In the pH homeostasis lab, 6 experiments were conducted. The hypotheses were: If base is added to water then the pH will increase; If acid is added to water then the pH will decrease; If base is added to homogenate, then the pH will increase; If acid is added to homogenate, then the pH will decrease; If acid or base is added to buffer, then the pH will remain the same. After the experiments were conducted, the graphs were somewhat similar to the hypotheses.
Apparatus: * 1 measuring cylinder * 1 test tube * 1 stop clock * A large gelatine cube containing indicator and NaOH * Hydrochloric acid ranging from 1-3 molars * A scalpel Diagram: Method: * Take the large gelatine cube and cut into 15 equal pieces * Place on piece of the cube into the test tube * Measure out 10mls of HCl in the measuring cylinder * Pour the HCl into the test tube with the gelatine cube and start the clock * Time how long it takes for the pink colour inside the gelatine cube to completely disappear * You will also notice that the cube dissolves slightly * Record your results and repeat this same process 3 times for each molar of acid: § 1 molar § 1.5 molar § 2 molar
Planning Firstly here is a list of equipment I used. Boiling tubes Weighing scales Knife Paper towels 100% solution 0% solution (distilled water) measuring beakers potato chips Cork borer. We planned to start our experiment by doing some preliminary work. We planned to set up our experiment in the following way.
acid. This will let me take at least five sets of results, and if the
The hypothesis to this experiment is "if you place a plant under water in direct sunlight, then it will produce oxygen bubbles." In this experiment the independent variable where the plant is placed. The dependent variable is the water the plant is put in. Your controlled variable would both be the type of water used and the type of plant used. The conclusion to this experiment would still ben your hypothesis because its true which is " if you place a plant under water in direct sunlight, then it will produce oxygen bubbles." The only flaws in this experiment were that they used the same type of water and they did not try any other water. I believe that this experiment is
The purpose of our lab is to find the red cabbage pH indicator; you must know the acids and bases of the solution to find the indicator. Anthocyanin pigments in red cabbage can be used to determine the pH of a solution based on the color it changes to. In order to determine the pH indicator for the red cabbage you must find the pH values of those solutions from the liquid dyes, also known as the pH indicators.
The test is to see if spinach leaves discs can be effected by photosynthesis. I predicted that more disc would float in the light than in the dark. After writing down my hypothesis, I put the discs in water on a petri dish and waited 15 minutes. I then recorded if the in the light were floating or not. I also found out that the disc will also change color when they are in the light or in the dark. The hypothesis is supported when the light does have more disc floating in the petri dish than the dark did. I also determined other things as well such as the the dependent and independent variables, and the control treatments. The independent variable is the amount of oxygen in the discs. The dependent variable is the light, darkness, and the amount
For the solid sodium chloride, using distilled water will make it an aqueous solution. Just like before using red and blue litmus paper will only indicate that the sodium chloride is neutral. The same can be done for sodium carbonate since it is soluble in distilled water, making it easy to determine whether it is an acid or base when using litmus paper. In this case, sodium carbonate is a base so red litmus paper will turn blue when the solution of sodium carbonate is dripped on to it.
The design for this study will be a simple between subject experiment consisting of one experimental group and one control group. The independent variable will be warm colors. The dependent variable will be mood. The main goal is to determine if the independent variable will influence or cause difference in the specified dependent variable. The experiment group will spend 60 minutes in a warm paint color room and their mood will be measured. The control group will spend 60 minutes in a neutral paint color room and their mood will be measured.
Dependent Variables Amount of vitamin C in fruit juices. Controlled Variable Same amount of liquid for each fruit juice.... ... middle of paper ... ...
Independent variables: The temperature of hcl gas will be decreased and increased throughout the experiment.
Based on the experiment using the red cabbage, I can tell if a liquid is an acid, base or neutral using red cabbage juice as an indicator.