What precautions should we follow when conducting experiment in Environmental lab?
Q: clinical technician finds that the activity of a sodium-24 sample is 1088 cpm. What will be the…
A: The elimination half-life of a drug is defined as the time it takes for the concentration of the…
Q: Most of the chemicals included in the kit can be discarded down a drain with copious amounts of…
A: Chemical disposal is a challenge as some chemicals are unsafe and hazardous when dumped directly…
Q: With the aid of a labelled diagram, outline the principle of the oil immersion objective
A: A microscope is an intrument which helps to enlarge microscopic images which are not visible to…
Q: O The job of splitter in GC is taking part of the sample. O Column in GC should be placed in a…
A: Introduction Splitter as the name suggests splits the sample. It controls the amount of sample that…
Q: The most sensitive and reliable instrument for detectingand characterizing flammable residues is the…
A: Flammable liquids can be easily ignited in the air at ambient temperature. These are ethanol,…
Q: When a thermometer is placed in a substance, what is it actually measuring? density heat pressure…
A: Different instruments are used to measure volume, density, heat, pressure, and temperature, etc.…
Q: For the sake of convenience, a laboratory staff stood on tiptoes without the help of a foot stai for…
A: The appropriate measures need to be taken to prevent the risk of hazards, especially in health care…
Q: MECHANICAL METHOD OF WATER TREATMENT AT THE WATER- WIRED STATION 1. filtering 2. defending 3.…
A: Mechanical filtration system in water treatment plant uses different units to filter out suspended…
Q: How is the activated sludge removed? Why does the treatment facility add chlorine to the water? What…
A: 1) In liquid waste water treatment, flocs (masses of bacteria associated with fungal filaments to…
Q: METHODS OF WATER TREATMENT AT THE WATER-WIRED STATION 1. ozonation 2. coagulation, sedimentation,…
A: In a public water treatment plant the water is made safe for drinking by the help of number of water…
Q: Which of the following water quality assay methods produce the greatest amount of biohazardous…
A: Introduction A biological hazard, often known as a biohazard, is a biological substance that…
Q: 1- Are the following changes in conditions likely to increase or decrease retention time? a. faster…
A: "Since you have asked multiple questions, we will solve the first question for you. If you want any…
Q: Which of the following can most likely increase the yield of recrystallized benzoic acid? CHOICES:…
A: Recrystallization is a method that is used for the purification of solid compounds by the removal of…
Q: Which objective should always be in place at the beginning of observing a specimen? O A) low (4X) B)…
A: An objective lens is one of the lenses present in a compound microscope. The objective lens are…
Q: A service laboratory developed a testing procedure for the determination of four heavy metals in…
A: Limits of detection (LOD): The lowest concentration of an analyte in a sample that can be…
Q: Explain why the following step are necessary during subculturing: Flaming the neck of…
A: Aseptic technique-Aseptic technique should be observed whenever microorganisms are transferred from…
Q: You want to pipette 250uL of a sample in the lab. Which pipetter do you use? O p20 O p200 Op2 O…
A: Pipetter It is a laboratory tool commonly used in chemistry, biology and medicine to transport a…
Q: Can you explain on your own words why the thermometer should not be shaken rigorously to lower the…
A: Glass thermometer containing mercury that helps to record the body temperature.
Q: What purpose does water services in the “Effects of Antiseptics & Disinfectants” lab? What did you…
A: Antiseptics are used on living organisms, such as human skin, to kill any microorganisms living on…
Q: Explain this example of the following water quality serial dilution. Note the dilution factors and…
A: Given information TNTC - Too many to count in plate 1:1 TNTC- in plate 1:10 10 cfu's= 1:100 1 cfu's…
Q: Which of the following is considered chemical control? O a. None O b. Heat, alcohols, ethylene oxide…
A: Chemical control is way to restricting the growth of pathogens. It is based on substances that are…
Q: The dilution factor for Sample 1 if 20 µL of extract is added to 980 µL distilled water is 50. What…
A: Given Values: Dilution factor for sample 1 = Total Volume of the diluted sampleVolume of the…
Q: Discuss the different methods of water analysis to determine pollution.
A: Introduction Water quality analysis is performed to assess the chemical, physical, and biological…
Q: Electrostatic precipitators or wet scrubbers can be used to reduce pollution. O particulate matter…
A: Pollution caused by industrial activities and combustion is of great concern Various abatement…
Q: What are the precautions that should be observed during the experiment for making soap
A: Soap is a fatty acid salt that is used in many cleaning and lubricating goods. Soaps are surfactants…
Q: a. Always hold a loaded micropipette in a vertical position e. Always release the plunger slowly f.…
A: Micropippet is a pipette used to transfer or injust very small or minute volumes of liquid. These…
Q: 1. List the glassware/s and equipment you needed to measure 3.0915 grams of ZnCl 2 and dissolve it…
A: Introduction To conduct an experiment with precision and accuracy, the right apparatus and types of…
Q: Sludge that has been completely combined with water is recycled activated sludge. What are the…
A: ACTIVATED SLUDEGE BASICS- The activated sludge process is a biological wastewater treatment process…
Q: Justifythe importance to have full characteristics test off water sample before proceed with the…
A: Water has great importance in perspective of biological system.it act as an universal solvent many…
Q: How much sample should be injected into the GC? O 1) 0.5 microliter 2) 15 microliter 3) 5 microliter…
A: With the help of gas chromatography (GC) compounds in a mixture can be separated by injecting them…
Q: Test solution Indicator that can be used Initial colour of the solution Final colour of the solution…
A: Litmus paper is a paper which is prepared with the help of litmus solution. It tells about the…
Q: Which are the toxic chemicals used in preparation of samples for TEM? How should these be handled…
A: Microscope helps to observe the organisms or objects that can not be seen by our naked eye because…
Q: A sample of pond water is tested using the most probable number method. There are 3 positive tubes…
A: Given , 10 mL - 3 positive tube 1 mL - 1 positive tube 0.1 mL - 1 positive tube
Q: What special precautions must be taken when using the oil immersion (100x) objective?
A: Using oil immersion reduces the air gap between the glass slide and the objective lens. This air gap…
Q: Apparatus used to add a liquid to a solid in the generation of a gas
A: Kipp's Apparatus is used to prepare gases
Q: SPECIAL METHOD OF WATER TREATMENT AT THE WATER-WIRED STATION 1. boiling 2. softening 3. ozonation 4.…
A: The specialized water treatment usually includes various types of methods such as physical method…
Q: 7.3x105 CFU/ml= Broth culture, how many bacteria would be contained
A: The number of viable bacterial cells in liquid culture is estimated by means of a colony-forming…
Q: UESTION ANSWER 0.IM PIPES (pKa = 6,8) %3D mich of the following aqueous solutions has the highest…
A: The dissociation of a weak acid is described by the Henderson-Hasselbalch equation:Ka = [H+][A-] /…
Q: How many grams of media would be required to prepare 350 plates assuming 20 mL per plate? O 72 O 112…
A: The preparation of mentioned Escherichia coli culture media contain 36 grams per litre deionized…
Q: the Biozhazards that may occur, when performer performing analysis of biological samples on Mass…
A: Following Biohazards may occur while performing mass spectrometry on biological sample. 1) It may be…
Q: Give the color of the potato mixed with Lugol's iodine solution in these situations before exposure…
A: Lugol's iodine solution is a biological stain, chemical reagent, and used as a starch indicator.…
Q: INDICATOR INDIRECTLY INDICATING FOR FRESH WATER POLLUTION BY HOUSEHOLD-CONSUMER WASTE WATERS 1.…
A: Introduction :- Water pollution occurs when chemicals contaminate water sources, rendering the water…
Q: RODAC plates are used for Select one: Water sampling Air sampling Sterility testing Surface…
A:
Q: What is the hazard of the spattering tendency in heating
A: Sterilization is the process of cleaning a substance by removing, killing or deactivating all forms…
Q: If a patient has a pH of 7.02 which is outside the accepted range what would I administer? NaHCO3…
A: Blood pH measures the the acidity or alkalinity of blood. The normal blood pH range is 7.35-7.45.…
Q: What physical factors can influence the activity of a disinfectant
A: Introduction- Disinfection is the process by which we can eliminate the growth of microorganism…
Q: actors that affects the efficiency of the disinfectant
A: Disinfection is a kind of process of elimination of pathogens or microorganisms and decreasing them…
Q: CHLORINATION IS 1. by means of special water treatment 2. the physical method of water purification…
A: Chlorination is one of the methods used for the disinfection of water. Millions of microorganisms…
Q: TUBE 1 TUBE 2 TUBE 3 TUBE 4 TUBE 5 Volume pipetted Total volume Sample volume: Total volume (ratio)…
A:
- What precautions should we follow when conducting experiment in Environmental lab?
- How can you determine chloride content in a waste water sample?
Step by step
Solved in 2 steps
- What are the advantages and disadvantages of the filter method in the analysis of water samples? Why is the incubation temperature critical for this test?A water sample contaminated with chloride ion, how can you estimate the sample purity?In sterilization, which among the supplies, instruments, glassware, etc. under the list of materials can be sterilized using either or both equipment below? List them down under the category: a) For “autoclaving” only, B) For Dry heat oven sterilization ,And C) Can be sterilized with either. Materials: 200-ml Erlenmeyer flask Stove 500-ml Erlenmeyer flask Autoclave 10-mL graduated cylinder Analytical balance 100-ml graduated cylinder pH meter Spatula Stirring rod 100-mL beaker Test tubes Distilled water Petri dish Stirring rod Alcohol lamp Glass dropper
- I do not understand the results of this experiment, explain what the results of this experiment are and the purpose Table 2 Absorbance vs CoCl2 concentration Test Tube Number Cobalt Chloride Concentration (mol/mL) Absorbance at 510 nm 1 0.000 0.000 2 0.009 0.024 3 0.018 0.055 4 0.027 0.085 5 6 0.036 0.045 0.112 0.138 7 (Unknown) 0.088When a SBIA021 student measured the pH of 1.0M HCI, the student obtained a pH meter and failed to neither check the condition nor the manner of usage of the instrument. The pH meter reading timed out (Did not give a reading) Which of the following problem explanations is most correct? A)The sample in the glass beaker was being swirled vigourously while the electrode was submerged in it for a reading. B)The electrode got submerged much deeper into the solution than it should have. C)All of the above are correct problem explanations O D)The electrode had long direct contact with the environment and the glass membrane got dry.Can you explain on your own words why the thermometer should not be shaken rigorously to lower the reading to zero before using it?
- Calculate the CFU present in 150 mL water sample and b) dilution factor up to 5. Consider the following dilution scheme.Explain the color changes observed throughout the peroxide value of oil experiment. Materials:1. Old and fresh oil samples2. Distilled water3. Acetic acid/chloroform solution4. Saturated potassium iodide solution5. Sodium thiosulphate (0.01M)6. 1% Starch indicator: dissolve 1g of starch in 10 ml of water and then add 90 ml of hotwater to itWrite shortly about the instrumentation of ATR spectroscopy.
- A sample is diluted by a factor of 10 five times. The 10^-3 dilution has 272 colonies on it. Assuming you plated the same volume on each plate, how many colonies would you expect to find on the 10^-4 plate? Include units and use OCD formula.Explain this example of the following water quality serial dilution. Note the dilution factors and how you would calculate #’s from the incubated plates. ……A serial dilution yielded TNTC in the 1:1 plate and the 1:10 plate, 50 cfu’s in the 1:100 plate and 3 cfu’s in the 1:1000 plate . What is the concentration (CFU)/ml of the raw sample? Is water acceptable for potable or Recreational use? Explain. When do you use filtration rather than serial dilutionTwo compounds have Rf values of 0.50 and 0.61, respectively. The solvent front on a plate is developed to 10 cm. How far apart in centimeters are the spots for the two compounds?