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A corrosion technologist pipetted a 100 ml hard water sample and titrated it with 37.64 ml of 0.01 m edta solution for a total hardness endpoint and 29.32 ml of 0.01 m edta solution for a calcium?
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What is the formula for titration?
Vr * cr = Vt * ct ==>Actually this is only true for an one-to-one molecular reaction,otherwise it should be corrected for a well balanced titration reactionThus:cr = [ Vt * ct ] / [ Vr ]in which:V = volume (ml) (Vr is mostly the exactly pipetted volume of the 'unknown' solution)c = concentration (mmol/ml) (cr is mostly the 'unknown' conc.)index r = reactant (to be analysed)index t = titrant (compound reacting with reactant)
What is used to identify acids and bases?
an acid is a material or substance that is sour and can change blue litmus paper red a base is a material or substance that is bitter (it sometimes ) and can change red litmus paper blue. Litmus paper can tell an acid from a base Lemon Juice is an acid coffee is a base.
What is a buret used for?
A burette, or buret, is a uniform-bore glass tube with fine gradations and a stopcock at the bottom, used especially in laboratory procedures for accurate fluid dispensing and measurement.The buret is commonly used in titrations to measure precisely how much liquid is used.(see related links)
Why an unequal distribution of cells on the hemocytometer counting chamber usually occurs?
The reasons are almost TNTC (Too Numerous To Count, which is somewhat of an inside joke in Microbiology. It's the notation used when there are too many colonies to count on a culture plate) A Hemocytometer counter is a special kind of microscope slide that is used to count cells in cell culture microbiological, clinical, biotechnological and other fields. It has an etched grid, raised sides, and a cover. The grid has variable markings that are used to calculate different areas, and a fixed depth, so the volume of the different portions can be calculated and the volume of the entire chamber is constant. Liquid with cells suspended inside are added to the space with the grid, the analyst looks through the microscope, and using the grid markings, counts how many cells are in a specific area. Knowing the area, volume and number of cells, the analyst can calculate how many cells are in his original sample. Now, to the matter of unequal distribution of cells in the counting chamber. Before loading the chamber, the sample has to be prepared. Skimping on any of the preparation steps can cause clumping of cells. Is the sample well mixed? Is is free of contaminants? If its an adherent culture, are the cells well separated? What dilution did you use and did you mix the cells well enough? when you pipetted the sample to load the chamber did you pipette up and down enough times to prevent clumping? When you filled the chamber did you disturb the coverslip during uptake? Are the cells sticky and need some kind of surfactant you didn't know about to be counted at all? And I haven't even started on dyes, age, shape size, drying, film distortions and just plain sullenness on the part of your cells that day (don't laugh if you don't work with cultures, all of them need to be beaten into submission now an then). There are no hard and fast reasons for anything in the biological sciences, or any science for that matter, just best guess the seems to work almost all of the time. That's why we talk about theories, facts keep showing up that don't fit in with what everyone accepts and we all gotta change what we accept.
Why the Erlenmeyer flask does not have to be dry and why water may be added after the 25.00-centimetre Cube of Acid has been pipetted in?
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Does serum contain DNA?
Serum is generally free from blood cellular components but when collecting serum sometimes few cells will be pipetted with the serum & that is the only source of DNA in the serum.
How would air bubbles in the tip of a buret of Na OH effect the efficiency number of antacids?
The final reading is then taken including the bubbles. So if the bubbles are 2 mL and your buret reads 12 mL. It seems like there is 12mL added, but the bubble was not taken into account. So you only pipetted 1o mL yet the bubble made it seem like 12.
What is the formula for titration?
Vr * cr = Vt * ct ==>Actually this is only true for an one-to-one molecular reaction,otherwise it should be corrected for a well balanced titration reactionThus:cr = [ Vt * ct ] / [ Vr ]in which:V = volume (ml) (Vr is mostly the exactly pipetted volume of the 'unknown' solution)c = concentration (mmol/ml) (cr is mostly the 'unknown' conc.)index r = reactant (to be analysed)index t = titrant (compound reacting with reactant)
What are some eight letter words with 1st letter P and 4th letter E and 5th letter T and 6th letter T?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 5 words with the pattern P--ETT--. That is, eight letter words with 1st letter P and 4th letter E and 5th letter T and 6th letter T. In alphabetical order, they are: palettes pipetted pipettes popettes proettes
What are some eight letter words with 1st letter P and 3rd letter P and 4th letter E and 6th letter T?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 4 words with the pattern P-PE-T--. That is, eight letter words with 1st letter P and 3rd letter P and 4th letter E and 6th letter T. In alphabetical order, they are: pipestem pipetted pipettes popettes
What are some eight letter words with 2nd letter I and 4th letter E and 5th letter T and 6th letter T and 8th letter D?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern -I-ETT-D. That is, eight letter words with 2nd letter I and 4th letter E and 5th letter T and 6th letter T and 8th letter D. In alphabetical order, they are: pipetted rivetted
What are some eight letter words with 1st letter P and 2nd letter I and 4th letter E and 5th letter T and 7th letter E?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern PI-ET-E-. That is, eight letter words with 1st letter P and 2nd letter I and 4th letter E and 5th letter T and 7th letter E. In alphabetical order, they are: pipetted pipettes
What are some eight letter words with 1st letter P and 2nd letter I and 3rd letter P and 5th letter T and 7th letter E?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern PIP-T-E-. That is, eight letter words with 1st letter P and 2nd letter I and 3rd letter P and 5th letter T and 7th letter E. In alphabetical order, they are: pipetted pipettes
What are some eight letter words with 2nd letter I and 4th letter E and 5th letter T and 7th letter E and 8th letter D?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern -I-ET-ED. That is, eight letter words with 2nd letter I and 4th letter E and 5th letter T and 7th letter E and 8th letter D. In alphabetical order, they are: pipetted rivetted
What are the 4 steps used to extract DNA?
This is an ambiguous question: are we talking about obtaining DNA samples from the person, are we talking about obtaining DNA from the specimen? Obtaining DNA from a person is as simple as swabbing the person's buccal mucosa, which is inside a person's cheek. Obtaining DNA from a specimen is a process by which DNA is extracted by using chemicals that emulsify the cells to extract the DNA, then centrifuging the mixture to extract it. The DNA is then pipetted into a radioactive gel that identifies each strand's DNA structure. The preparation is then x-rayed to reveal the unique DNA structure.
What are some eight letter words with 4th letter E and 5th letter T and 7th letter E and 8th letter D?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 21 words with the pattern ---ET-ED. That is, eight letter words with 4th letter E and 5th letter T and 7th letter E and 8th letter D. In alphabetical order, they are: benetted bewetted curetted denetted facetted gazetted insetted pipetted resetted revetted rewetted rivetted rosetted safetied sheetfed suretied unletted unnetted unvetted unwetted upjetted
