PilonM-Experimental

Please answer as much as I can

Three labs were contracted to measure the concentration of a 5.50 ppm Ca2* standard solution. They each measured the solution 3 times, and their results are as follows: Measurement 1 Measurement 2 Measurement 3 Laboratory 1 5.47 ppm 5.54 ppm 5.50 ppm Laboratory 2 5.32 ppm 5.44 ppm 5.56 ppm Laboratory 3 5.61 ppm 5.62 ppm 5.60 ppm Select ALL of the TRUE statements about the measurement capabilities of these labs. Lab #3 was the most precise. Lab #1 was the most precise. Lab #1 was the most accurate. Lab #2 was the most precise. O.Lab #2 was the most accurate. Lab #3 was the most accurate.

The protein concentration of a protein isolate was determined using the Bradford assay. Five dilution of bovine serum albumin (BSA) were prepared from a 5.00 mg/mL BSA stock solution. To these dilutions, 100 µl of Bradford reagent were added. After 5 minutes, the absorbance was taken at 595 nm. Standard # BSA, in mg/mL Volume of Bradford reagent, A595 in mL 1 5.0 0.000 1.00 5.0 0.134 3 2.00 5.0 0.265 4 3.00 5.0 0.388 4.00 5.0 0.497 The supernatant dilution was prepared by mixing 49 µL of the protein isolate with 16 µL water. The absorbance was taken 5 minutes after addition of 100 mL Bradford reagent. Calculate the protein concentration (in mg/mL) of the original isolate if the absorbance at 595 nm was 0.413. Note: Final answer format must be x.xxx (three decimal places). Round off only in the final answer. Do not round off in the middle of calculation.

SERIAL DILUTION: PROBLEM SOLVING.   Set up five (5) tubes on the test tube rack and label them 1-5. Place 0.9 ml of saline to tube #1 and 0.5 ml of saline to tubes # 2-5. Add 0.1 ml of patient's serum to tube #1, mix and transfer 0.5 ml of the mixture to tube # 2. Then, mix and transfer 0.5 ml of the mixture to tube # 3. Mix and continue dilutions through tube # 5. Discard 0.5 ml from tube # 5. Finally, add 0.5 ml of the reagent to each tube # 1-5. Compute for the initial dilution of tube #1 and final dilution of tube #5. Show your computation and encircle your final answer.

5

Concentration of TZ stock solution (μMμM) 42.06

please i really need your help with this

Please answer fast i give you upvote.

8

Table of  caffeine standards concentration . Sample Conc, ppm Std1 16 Std2 32 Std3 48 Std4 64 Std5 80   If the volume used to make 100 mL  of std 1 is 2 uL what is the concentration in M used to make std calibration curve ?  The standards are going to be used to build calibration curve to analyze caffeine in  an energy drink.  if 500 mL of  the energy drink  has target of 400 mg , how will you prepare the sample if you need  10 mL for the analysis ?   Caffeine MM=194.19 g/mol.

A student was given a stock ascorbic acid solution of 2.323 mg/L. Following the directions in the lab, the student obtained the data below. Calculate the concentration of ascorbic acid in the Standard (in microgram/L, ug -). Report your answer with one place after the decimal. initial final initial volume final volume volume volume color reagent color reagent stock stock solution solution solution solution Standard 1.35 mL 6.64 mL 5.12 mL 9.32 mL

Help with question

2. Show solution. Thanks!

7-10 subparts

A sample of rainwater was collected from four separate locations across theMetroplex. Each sample was measured once by two separate methods for the presence ofsulfate. Determine whether the two methods are equivalent with respect to giving thesame answer for [SO42-].

ASSAY Calibration solutions Calibration solutions of naproxen in the range 5 – 25 μg/mL were prepared. Sample preparation 20 tablets weighing 12.3819 g were crushed to a fine powder. A portion of the powder (145.4 mg) was shaken with approximately 150 mL of acetic acid (0.05 M) for 5 min and then made up to volume in a 250 mL volumetric flask (stock solution). Approximately 50 mL of the stock solution was filtered and a 25 mL aliquot was diluted to 100 mL in a volumetric flask. 10 mL of the resulting solution was further diluted to 100 mL with acetic acid (0.05 M). Analysis The standards and sample solutions were analyzed by HPLC under the following conditions: Column: octadecylsilyl (ODS), 4.6 mmx150 mm, mobile phase: acetonitrile : 0.05 M acetic acid (85:15), flow rate: 1 ml/min, UV detection at 243 nm. Results: A calibration curve of concentration versus peak area was constructed for the standard solutions and gave the straight-line equation: y = 3555.6x + 85, r = 0.9999 The area…

Opioid dependence is described in the Australian Medicines Handbook as a chronic, frequently relapsing illness. One approach to managing opioid dependence is opioid substitution therapy (opioid maintenance therapy). The figure below depicts concentration-response curves for two drugs used in the management of opioid dependence compared to heroin: 100 LEGEND 60 U 20 0 0.0001 0.001 0.01 0.1 1 10 [Drug] (Log Units) Question: From the drugs listed below, select the options that are most likely to be represented by the concentration-response curves for: Drug A: Drug B: Buprenorphine Naloxone Methadone Naltrexone % Maximal Response 100 Heroin Drug A Drug B

Chemical Reactions: Molecular Equation: HCl(aq) + NaOH(aq) NaCl(aq) + H₂O( Net lonic Equation: H(aq) + OH(a (aq) Trial 1 Details Molarity of HCI Standard Solution Volume (mL) HCI Standard Solution No. of mmoles |HC| = No. of mmoles H+ No. of mmoles OH reacted with HCI No. of mmoles NaOH reacted with HCI Final Reading (mL) NaOH Buret Initial Reading (mL) NaOH Buret 25.00 22.17 0.05 → H₂O() Trial 2 0.1024 25.00 22.15 0.05

Can you give me a detailed step by step process of how to do this please, thank you !

You have a micro tube containing 1mL of a solution with 4.3x10^4 cells/mL and you are to produce a solution that contains 43 cells/mL. The most accurate way to do this is to preform a series of 1:10 dilutions (add 1mL of stock solution to 9mL of water to achieve a factor of 10 dilution). How many of these dilutions must you preform to achieve the desired solution?

Let me tell you about their task: The students were provided with 5 drinks (sports/soft drinks) and they were asked to determine the glucose concentration in these drinks in the units of g/100mL. (Why these units? Well, once the students have the concentrations in g/100mL they will be able to compare their values with the nutritional values given on the drink bottles’ labels). The samples of the five drinks were all diluted 1/100 (i.e. by a factor of 100). This was an essential step in the method because, without it, the machine used to analyse the glucose concentration (spectrophotometer) would have given an error as the concentration would have been too high for accurate detection. What this means for the students is that the dilution factor will have to be taken into consideration in their calculations (remember the aim is to calculate the concentration in the original drink and not in the diluted drink). The students decided to save time and form five groups where each group was…

2) Which of the diet sodas have the lowest concentration of aspartame? Which standard best reflects this concentration?

Part A: Standardization of Potassium Permanganate, KMnO4 Solution Your Data Group I Group II Group III Mass of Na2C2O4 used 0.23 9 0.30 g 0.22g 0249 Initial buret reading Om L 3 mL 0 mL 0 mL Final buret reading 36.6 mL 28 mL 31.3mL 51.1mL Volume of KMnO4 used 36.6 mL 50 mL 31.3 mL 51.1mL 25+25

To quantify the amount of ethanol in a beverage, a technician prepared the first solution which contained 4.90 grams unknown, 1.00 grams acetonitrile, and 4.10 grams water. After the GC analysis which reported the peak areas of 5,742 for ethanol and 3,829 for acetonitrile, the technician added 0.20 grams ethanol to the first solution and ran the GC analysis again. This time, the peak areas of 6,382 for ethanol and 3,709 for acetonitrile for solution 2 were obtained. What was the percent by mass ethanol in the original beverage?

Dr. TS You found lead in blood collected from children living within 5 km from the Ship Channel. Calculate weighted average lead concentration (mg/L) in their blood. Age group (n) Average lead concentration (1ug/dL) 25 1-2 years (30) 3-4 years (50) 5-6 years (50) 7-8 years (40) 9-10 years (60) 30 35 40 40

Complete the table and provide the percent (%) recovery for each extraction.

Results: Part 1: Sensor reading Solution Step Initial Vol (ml) Final Vol (ml) Molarity Moles of Solute preparation 500 ml 500 ml 0.680 mol/L dilution 500 ml 700 ml 0.478 mol/L draining 700 ml |400 ml 0.478 mol/L evaporation 400 ml 250 ml 0.710 mol/L

A portion prescription balance has a sensitivity requirement of 4 mg. Explain how you would weigh 5 mg of hydromorphone hydrochloride with an error not greater than 5%. Use lactose as the diluent.