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Your results might be different then these but I hope this will give you an idea for an answer
a. In our lab we observed growth in all of the test tubes. Originally we had hypothesized that the tubes with higher concentrations of disinfectant would inhibit the growth of the inoculated organism. This experiment allows us to conclude that the disinfectant is not very efficient. Although we were able to come to a conclusion, our results are limited to the organisms that we used to inoculate the test tubes. Different organisms might be more resistant to the disinfectant. A conclusion that the disinfectant we used is inefficient with all bacteria cannot be made.
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Why FeCl2 is not used to identify phenol?
Because it's a test for phenols or enols
Are there limitations to the oxidase test?
There are none.
When using the phenol red carbohydrate broth fermentation test at what pH is the pH indicator yellow?
below 6.8
What is the triiodomethane reaction of phenol?
The triiodomethane (iodoform) reaction of phenol involves the conversion of phenol to iodoform in the presence of iodine and sodium hydroxide. The reaction proceeds through oxidation of phenol to benzoic acid, followed by further oxidation and degradation to iodoform. This reaction is commonly used as a test for the presence of a methyl group attached to a phenolic compound.
What is the chemical basis of the iodine and Molisch's test?
The iodine test: the ion I3(-) react with starch forming a blue color.Molisch test: dehydrated saccharides (with sulfuric acid) form an aldehyde whic react with a phenol an a red color is obtained.
Phenol coefficient test in microbiology?
Phenol coefficient test is best known screening test in which potency of a disinfactant is compared with that of phenol. A series of a dilutions of phenol and the disinfactant being tested are prepared. A standard amount of Salmonella tyhpii and Staphylococcus aureus are added to each dilution; the dilutions are then placed in a 20 to 37oC water bath. At 5-minute intervas, samples are withdrawn from each dilution and used to inoculate a growth medium, which is incubated for two or more days and then examined the growth. If there is no growth in the growth medium, the dilution at that particular time of sampling killed the bacteria. The highest dilution that kills the bacteria after 1o min. expousre, but not at 5min. is used to calculate the phenol coefficient. This is done by dividing the resiprocal of the appropriate phenol dilution.
What is the use of chick-Martin test?
Chick martin test is used to estimate the efficacy of a disinfectant. In this test a standard culture of Salmonella typhi, is tested for a fixed period (30 minutes) against various concentrations of phenol solution and various concentrations of the testing disinfectant; the result is expressed as the phenol coefficient, the highest dilution of the given disinfectante that kills bacteria, divided by the highest dilution of phenol that sterilizes the solution, within the measured time.
What is the use of chick martin test?
Chick martin test is used to estimate the efficacy of a disinfectant. In this test a standard culture of Salmonella typhi, is tested for a fixed period (30 minutes) against various concentrations of phenol solution and various concentrations of the testing disinfectant; the result is expressed as the phenol coefficient, the highest dilution of the given disinfectante that kills bacteria, divided by the highest dilution of phenol that sterilizes the solution, within the measured time.
Suggest a chemical test(s) to distinguish ethanol and phenol. Include the reagents reaction conditions and observations. And the equation?
Phenol solution, or phenol directly from the manufacturer?If the phenol is in the form it comes in from the factory, no chemical test is necessary. Phenol is a white crystalline solid.If it's dissolved in water, the easiest test is pH. Phenol solution is more acidic than ethanol. So...whatever you use for a pH test will do ya.
Does phenol give a positive biuret test?
No. The Biuret test only gives a positive result if a peptide bond exists. Phenol doesn't have a peptide bond, so it will not give a positive test.
What are the limitations of benzidine test?
The benzidine test is a test for cyanide. The limitations of this test are that benzidine has been linked to bladder and pancreatic cancer.
Why would vanillin test positive in a ferric chloride test?
It would test positive because there is a phenol group in vanillin.
Why FeCl2 is not used to identify phenol?
Because it's a test for phenols or enols
Why do ibuprofen and naproxen not give a positive test with 1 percent ironIII chloride?
Iron (III) Chloride reacts with the Phenol group. Ibuprofen and Naproxen do not have a phenol group. Acetaminophen, on the other hand, does have a phenol group with would indicate a positive test (purple color change) with in the presence of Iron (III) Chloride.
Why does phenol give a violet colouration with neutral FeCl3?
It is a test for presence of phenol. Fe itself is a transition metal that form a complex ions with phenol. Hence, the Fe can undergo d-d transition that give a colour which is purple in this case.
What test is an alternative to the contingency coefficient?
Cramers V
What is coefficient of consolidation?
Coefficient of consolidation (Cv) is a measure of time it takes for a soil to consolidate during the lab test.
