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The best way to avoid contamination of samples in experiments is to limit contact with anything not necessary in the experiment. Specialized equipment may also help with this regard, such as the use of glass to avoid unwanted chemical reactions.
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Why is pH electrode cleansed after each use?
To avoid contamination in other experiments.
Why the burette and the pipette are each rinsed with distilled water and finally rinsed with some of the solution that will be measured or transferred?
These are conditions necessary to avoid contamination or any other modification of the reagents.
Why the burette and pipette are each rinsed with distilled water and finally rinsed with some of the solution that will be measured or transfer?
These are conditions necessary to avoid contamination or any other modification of the reagents.
Why is wafting used during a scientific experiment?
Wafting method is used in scientific experiments to avoid inhaling the chemical.
How do you avoid cross-contamination?
use a linear workflow
Why is it necessary to use a fresh tip for each transfer when making dilutions?
Let's imagine what happens if you use your contaminated tip from the last dilution: You wouldn't only transfer cells from the diluted solution, but also take some cells that stick on the tip to your next dilution. So in effect, you will have more cells in the new dilution than you would expect - and your experiments results are improper.
Why are you advised to work as closely as possible to the flame?
to avoid contamination
Why you should avoid allowing the loop filled with inoculate from touching the lip of either the source bottle or the bottle to be inoculated?
To avoid cross-contamination, and indeed all other forms of contamination.
Why do we need different toothpicks to mix the blood and serum on slides 1 and 2?
Two toothpicks are used to avoid cross contamination.
Why is deionized water used in the soap making?
The addition of any other species into the water would raise its boiling point. I think typically you want to establish a a known temperature in whatever experiment you're doing. If the water was pure, then it would boil at exactly 100C
Why is there a need to clean the area where you will do the paraffin casting?
To avoid cross contamination.
What is the purpose of a weight paper when using a scale?
To avoid contamination of the instrument.
