Which of the following statements are true about the use of a blank inspectrophotometry? Select all that apply.Select 2 correct answer(s)A blank is needed because the spectrophotometer also measures the absorbanceof the cuvette and water.A blank must be measured prior to measuring your sample.None of the answer choices listed are correct.A blank must be measured after measuring your sample.A blank is only needed when the concentration of your sample is known.

Spectrophotometers are calibrated by using blank solutions. Basically blank provides the baseline…

Answered: Which of the following statements are…

Complete Textbook Of Phlebotomy

5th Edition

ISBN:9781337464314

Author:Hoeltke

Publisher:Hoeltke

Chapter1: Introduction To Phlebotomy

Section: Chapter Questions

Problem 10RQ

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Similar questions

Which of the following is/are source/s of error in performing a spectrophotometric method? Answer all that apply. Sample is turbid when the absorbance is read. The absorbances were read at maximum absorption. Standard solutions are prepared accurately. The cuvettes have fingerprints.
Assume your field of view under a 3X objective is 6mm across. What is the field of view in mm under a 20X objective? Show clear work with units for credit. Field of view 20X objective? ___mm What is the field of view of this 20X objective in micrometers? If you observe a specimen under the 20X objective and the specimen spans one-quarter of the field of view distance, how long is the specimen in micrometers?
The following image is a scheme for serial dilutions prepared for spectrophotometric analysis. If the stock solution concentration is 0.05 % (v/v) can you calculate the other tube’s concentrations in % v/v? I've used this with direct dilutions, how would I use this on serial dilutions?
If, when using 10X ocular and a 20X objective, the field size is 2 mm. The approximate field size with a 50X objective is ________ mm. 0.6 0.8 0.4 1
Which of the following statements is/are TRUE? Kindly choose all that applies. Select the correct response(s): When FOV increases, the specimen magnification decreases. When FOV increases, the light intensity increases. When FOV increases, the specimen magnification increases. When FOV increases, the light intensity decreases.
Here are the materials and method for the basic spectrophotometer experiment Materials:1. Paper template2. Scissor3. Light source (i.e. torchlight, portable light)4. Paperboard (black colour)5. Unused compact disc (CD)6. Camera detector (i.e. webcam, laptop, mobile phone) Methods: 1. Make a foldable paper spectrophotometer using the paper template and followthe instruction as in https://publiclab.org/sites/default/files/8.5x11minispec3.8.pdf2. Then, mounted the paper spectrophotometer to the camera detector.3. Download any freely available spectral analyzer.4. Test and observe the wavelength with and without the presence of a light source.5. Finally, observe the wavelength with a different transparent colour sheets (you canchoose any colour). Troubleshooting/ problem(s) encountered for basic spectrophotometer experiment.
Given: The used ocular objective while taking this image, has magnifying power of 6x The used objective while taking this image, has a magnifying power of 100x The used stage micrometer has spaces graduation of 01 mm each Ten (10) graduations pn the ocular micrometer conincided with two (2) graduations on the stage micrometer Question: What is the distance of one ocular division? Show your solution.
The labware we used in Quant Lab is divided into “qualitative” or “quantitative” analytical purpose. One of the important laboratory skills we learned is to know what specific apparatus is appropriate for the task at hand. For the following procedures, which SPECIFIC glassware, or balance ( CORRECT NAMES, be specific ) should be used? Mix K2Cr2O7 and KI solutions to be ready for titration. The mixture container is _______________ Measure the mV values of fluoride standard and sample solutions. Theoretically, the solution containers should be _______________________ Weigh 1 g solid KSCN that is poured into the thiosulfate – iodine titration. __________________
Given: The used ocular objective while taking this image, has magnifying power of 6x The used objective while taking this image, has a magnifying power of 100x The used stage micrometer has spaces graduation of 01 mm each Ten (10) graduations pn the ocular micrometer conincided with two (2) graduations on the stage micrometer Question: What is the total magnification of the image under microscope? Show your solution.
Given: The used ocular objective while taking this image, has magnifying power of 6x The used objective while taking this image, has a magnifying power of 100x The used stage micrometer has spaces graduation of 01 mm each Ten (10) graduations pn the ocular micrometer conincided with two (2) graduations on the stage micrometer Questions: What is the total magnification of the image under microscope? Show your solution. What is the distance of one ocular division? Show your solution. What is approximate cell length of Cell A, Cell B, and Cell C? What is approximate combine cell length of Cell A and Cell B? Show your solution. Remember: Always measure the cell length on the longest middle section of the cell!
Provide the Experimental procedure of the following: Example: Ninhydrin Test -The samples needed in this test were 1% casein solution, albumin and gelatin and the reagent used was ninhydrin (Triketohydrindenehydrate or Triketohydrin hydrate). Test tube, test tube stand, pippete, water bath, and spectrophotometer were the materials and equipment used. Ninhydrin reagent in 1-2 drops was added to 0.5 ml of the sample with care. It was mixed and heated to boiling for 1-2 minutes. Then, it was allowed to cool to record the observation. Test that needs Experimental procedure: 1. Heat denaturation Samples: Albumin, gelatin 2. Isoelectric Precipitation Samples: Casein 3. Concentrated Mineral Acids Samples: Albumin 4. Organic Solvents Samples: Albumin
Choose the one answer that fits best. Which of the following statements regarding the proper procedure for using Micropipettes is NOT correct? O a. You cannot use a 2-20 µl micropipette to pipet 200 µl O b. To expel all the liquid from the tip, you have to press the eject button O c. To draw up solution, press and hold the plunger at the first stop before entering the solution O d. Micropipettes always require the use of a disposable plastic tip O e. While pipetting, micropipettes should always be held as straight as possible

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