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Methods of analytical chemistry are applicable.

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Why is it important to refrigerate a urine sample?

Refrigerating a urine sample helps to slow down the growth of bacteria that can cause the sample to deteriorate or become contaminated. This helps to maintain the integrity of the sample for accurate testing and analysis. Refrigeration also helps preserve the chemical composition of the urine for more reliable results.


Grams of Cu in a 100 g sample of unknown?

your question is incomplete or incorrectly worded You want to know how much copper is in 100 grams of an unknown sample. The unknown could be made of anything, it may not even contain copper. You should include more information in your question


When should back titration be used instead of direct titration?

Back titration is often used when the analyte reacts slowly with the titrant or when interfering substances are present in the sample that can interfere with the direct titration process. Additionally, back titration can be more accurate when dealing with weak acids or bases where the endpoint may not be easily detected.


What is the overall effect of adding heat to any sample of particles regardless of its phase or state?

Adding heat to a sample of particles increases their average kinetic energy, causing the particles to move faster and collide more frequently. This can lead to changes in the phase or state of the sample, such as melting, boiling, or sublimation, depending on the specific material.


Why should you not return unused solutions or solids to the stock bottles?

The solutions or solids have already touched other surfaces or objects causing them to be contaminated and more bacteria/ or other living cell forms to be put into the substance that were not there to begin with.

Related Questions

Why is it important to refrigerate a urine sample?

Refrigerating a urine sample helps to slow down the growth of bacteria that can cause the sample to deteriorate or become contaminated. This helps to maintain the integrity of the sample for accurate testing and analysis. Refrigeration also helps preserve the chemical composition of the urine for more reliable results.


Is The standard deviation of all possible sample proportions increases as the sample size increases?

The standard deviation would generally decrease because the large the sample size is, the more we know about the population, so we can be more exact in our measurements.


Is there any way to test your blood sugar other than taking a blood sample?

Yes, you can test your blood sugar through a urine sample. The sample is checked with a colored dipstick that measures the presence of glucose in the urine. The blood sugar test with the blood sample is more accurate and more conventional.


How do you find whether given sample is DNA or RNA?

A spectrophotometer can be used to know if a sample is DNA or RNA. DNA has an absorbance maximaat 260nm, whereas RNA has an absorbance maxima at 280nm. By looking at which one of these two wavelengths the sample is more excited, one can determine if the sample is DNA or RNA.


What if a potassium chlorate sample is contaminated with KCL would the experimental percent oxygen be higher or lower than the theoretical percent oxygen?

If a potassium chlorate sample is contaminated with KCl, the experimental percent oxygen would be lower than the theoretical percent oxygen. This is because KCl does not contain oxygen, so the contamination would dilute the amount of oxygen produced during the decomposition of potassium chlorate.


What is difference between polluted water and contaminated water?

polluted water is more dangerous for use and contaminated water is poisiones then polluted


Why are random samples more representative of the population than other kinds of samples?

A 'random' sample - covers all age groups, genders, and other criteria. A 'targeted' sample might only cover a small part of the population.


Why did Egyptians drink beer more than water?

The beer was safer to drink, because plain water was often contaminated with bacteria and other impurities.


Why did the Egyptians drink beer more than water?

The beer was safer to drink, because plain water was often contaminated with bacteria and other impurities.


How many boxes must the processor sample to be 95 percent confident that the sample mean does not differ from the population mean by more than 0.2 pounds?

In order to answer the question it is necessary to know the population standard error.


Can a bring a urine sample that is from the kitty litter to the vet?

I depends on the doctor. I assume that the vet might want to take a urine sample of the kitten; after all, medical professionals are more "accurate" with these things, if you know that I mean.


The best way to keep your hands from being contaminated is to use the?

The best way to keep your hands from being contaminated is to use the?Read more: The_best_way_to_keep_your_hands_from_being_contaminated_is_to_use_the