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The standarized NaOH solution is kept in a stoppered bottle because it will react with atmospheric CO2.
The concentration will change because of this and your "standard" value will no longer be reliable.
6. Why should the standardized NaÓH solution be kept in a stoppered bottle? 7. What is...
Titration of Acids and Bases Pre-lab Questions t in the laboratory, you should be Before beginning this exper following questions. 1. Defined und how you would go whout doing it 2. Define the 3. Define the term 4. Why do you determine a mass by difference? 5. What are equivalence points and end points? How do they differ? 6. Why should the standardized N.OH solution be kept in a stoppered bottle? 7. What is parallax? Why should you avoid it?...
Explain why an opened bottle of carbonated water keeps its fizz longer if kept in a refrigerator than if kept at room temperature
4. Why is the flask not firmly stoppered during sublimation? derup $6 a po nimam ponu Soal to of land a
5. What is the pH of a 0.05M solution of koha 6. A bottle is labeled 0.0450M but the label can not be read. The pH of the solution is 2.78. Determine the pka of this substance. Ignore Activities
5. What is the pH of a 0.05M solution of KOH? 6. A bottle is labeled 0.0450M but the label can not be read. The pH of the solution is 2.78. Determine the pka of this substance. Ignore Activities
5. What is the pH of a 0.OSM solution of KOH? 6. A bottle is labeled 0.0450M but the label can not be read. The pH of the solution is 2.78. Determine the pka of this substance. Ignore Activities
Why do restriction enzymes need to be kept on ice? What order should the DNA, enzyme, water and buffer be added to the microcentrifuge tube for a restriction digest? If lambda DNA is linear, how many times would the enzyme have to cut the DNA to generate five DNA fragments? Would a shorter DNA fragment move faster or slower through the agarose gel than a longer fragment? Why?
5) Why should the medium be acidic in KMnO4 standardization? 6) What is the aim of adding SnCl, in Fe determination? Write the related reaction. 7) What are the function(s) of preventive solution? Explain. 8) Why an indirect method is applied for Ca' determination?
why should the maleic anhydride bottles be kept tightly closed when not in use? And then explain by the equaion.
Protein Purification of Mcherry Why should there be a small pocket of air above the solution in the dialysis bag during the dialysis procedure? Why should substances like proteins be lyophilized for storage purposes? Why not just freeze a protein-containing solution and store as it is? Why is a lyophilizing bottle not filled to capacity? Why is the heat of sublimation of water lower than the heat of sublimation of proteins?