Dissolved oxygen levels can also cause fish to suffocate and be more susceptible to diseases. Construct a hypothesis – Based on your observation in Question 1 and your background research in Question 2, develop a hypothesis statement that addresses the relationship between dissolved oxygen in the water sample and the number of fish observed in the body of water. Answer = If the dissolved oxygen level is high in a body of water, there will be a low number of fish. The higher the dissolved oxygen level the higher the death rate of the current fish. 3.
Abstract The purpose of this experiment was to investigate if Artemia salina is a good bioindicator for toxins in their environment used to detect pollution. Brine shrimp have a high tolerance for changes in their environment. Shrimp were exposed to varying concentrations of ethanol to test their tolerance level and determine the viability for the crustaceans. Four petri dishes of each concentration were used, as well as four dishes of a control that only contained brine water. Three hundred brine shrimp were placed in each petri dish for each of the controls and ethanol concentrations.
iLab, Week #2 CATIONS AND ANION LAB Introduction The purpose of the lab experiment is to demonstrate a double-replacement reaction of ionic compounds using a Erlenmeyer flask and a Buchner funnel with potassium chromate and lead nitrate. Also to show the relationship between anions and cations in a lab environment. Mixing the two ionic compounds: potassium chromate and lead nitrate caused a reaction to occur, forming a precipitate. The precipitate formed because these two reactants are not water soluble. The precipitate was the combination of lead nitrate + potassium chromate + the mixture of the two + lead chromate; or Pb(NO3)2 + K2CrO4 --> 2 KNO3 + PbCrO4 (I learned the above from the iLab overview and ChemLab introduction) Procedure Step 1: I added 50 ml of potassium chromate to 1M solution in a 100 ml beaker.
In the toxic mussels, the visible light absorption spectrum revealed a pattern that was characteristic of phytoplankton pigments. With further investigation, the pigments were found not to be poisonous though, and the aqueous layer consisted of the toxin. Column chromatography was used to separate the layer into organic acids and bases. Acids that were ionized quickly passed through because the resin called XAD-2 would not hold them in their polar ionized form. Out of all the acids that passed through, only one was found to be toxic.
Lastly, we got to witness and test the Law of Conservation of Mass through the reaction in this experiment. The list goes on, but these are just a few objectives from the recently conducted lab experiment. Background: Before this experiment we had knowledge on the safety of most of the materials we worked with. Copper (II) Sulfate is harmful by inhalation or ingestion. Iron (II) Sulfate is also harmful if ingested, and could cause death.
Objective The objective of this lab is to find the formula of an ionic compound. Materials: Copper Chloride Iron Chloride Sodium Hydroxide Well plate Indicator Toothpicks safety goggles pipets Procedures - collect materials label pipets according to the solutions inside. (CuCl, FeCl, NaOH, and the indicator) Using the pipet with the CuCl place 5 drops in the 5 wells in the well plate. Place one drop of indicator in those 5 wells. Starting on the 1st well place one drop of the NaOH at a time and mix with a toothpick until the NaOH has dissolved.
Determination of the Cause of a “Fish-Kill” in the Clark Fork of the Columbia River Introduction: The Clark Fork of the Columbia River has been experiencing large fish kills possibly due to the presence of Group IA IIA and IIIA metal ions (Na+, K+, Li+ Ca2+, Ba2+, Sr2+, Cu2+, and Fe2+). Ions such as these contribute to the salinity and/or toxicity of the water. Water that is either too salty or too toxic may cause fish kills. This experiment will show what ions are present in a sample of the contaminated water and determine if the ions present are at toxic levels. Water samples from the Clark Fork have been taken and will be tested using both absorption and emissions spectroscopy in order to check the levels of group IA and IIA metal ions.
Label the drinking water samples with the numbers 1 and 5, the distilled water sample as 2 and the non drinking water samples from the lake as 3 and 4. 2. Set the selector switch on the side of the conductivity probe to the 0-2000 µS/cm range. Connect the conductivity probe to Logger Pro 3. Set up the data collection mode on Lab quest and select mode on the meter screen.
When the algae die and decompose, they deplete the available oxygen in the water for fish, causing them to die. In humans, drinking water that is high in nitrates can interfere
The acidic nature of acid rain falls into rivers and lakes and make them acidic enough to hurt aquatic organisms living in them. The normal acid level for lakes and streams is around 6.5. Fishes and animals that live in the water have some sort of tolerance to the acid in water, but the lower the PH level gets, so does their body weight. At lower than 5 PH, adult fish can start dying and most fish eggs cannot hatch. It can create a disturbance to ecosystems, because different fish have difference tolerance