Answer the question in full details: Is it possible for a volumetric pipette to have a high precision but low accuracy? How could this situation arise?
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Answer the question in full details: Is it possible for a volumetric pipette to have a high precision but low accuracy? How could this situation arise?
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- What is a "heuristic method"? (a) Give a short (not more than two sentences) explanation. (b) Give at least three examples for heuristic methods.A stock solution of 7.99 microM dye is provided. While making one of the standard solutions, a student records the following data. The initial buret reading for dye is 2.58 and for DI water is 1.94. The final buret reading for dye is 8.60 and for DI water is 6.42. Calculate the concentration of dye in the standard. Your answer should be given in microM and reported to two decimal places.What are the advantages and disadvantages of volumetric and gravimetric analysis?
- The pharmacist attempts to weigh 80mg of sodium carbonate on a balance having a sensitivity requirement of 4mg. Calculate the maximum potential error in terms of percentage.(a) A solution of 20.91 % by weight H2SO4 has a specific gravity of 1.150. What is the normality of this solution? (b) Water is added to dilute this solution to a solution of 3.03% by weight H2SO4 (SG= 1.020). What is the new normality of the resulting solution and how were they mixed? (Assume 100 mL of the original solution was used.)In the Analytical Chemistry laboratory, one of the B.Sc student Ms. Fatma wanted to analyze the presence of Iron(II) ion in the water samples collected from Sohar Industrial Area in the Sultanate of Oman and analyzed by Spectrophotometric method. (1) 250.00 mL of this water sample (Solution A) known to contain unknown amount of FeSO4. She has diluted Solution A by a dilution factor 10 to make 250.00 mL solution, which she labeled Solution B. Using Spectrophotometer, she has measured the absorbance value (0.642) for Solution B at 508 nm using 1.00 cm cell (cuvet). The molar absorptivity value for Fe2* ion at 508 nm is ɛ508 = 30.8 M-1cm1. (i) What volume of the solution A did she require to make the 250.00 mL of Solution В? (ii) in (i)? What instrument should she use to transfer the volume of the Solution A calculated (ii) Concentration of FeSO4 in Solution B. (iv) Concentration of FeSO4 in Solution A. Mass of FeSO4 in Solution A (Show your calculation) (v)
- Match the units to the setup below for calculation of molarity X when dissolving a liquid X (X g)(density = D g X/mL X) in a liquid Y (Y mL)(density = D g Y/mL Y). All equations are set up so that the unit on the bottom cancels with the unit on the top to its immediate left. Be sure to match any unused answers to "Unused answer". X gx= 2._ = 7. _ 1.- 5._ X gX :+Y mL 6. mL X 1. 1. mol X/L 2. 2._ MW g X 3. 3. Dg X 4. 4._ 1000 mL 5. 5._ 6. 6._ 1 L 7. 7. 1000 L 8. Unused answer 1 mol X > > > > > > >How many of the following should be included in a good hypothesis? (i) A prediction of the results of the experiment (ii) A step-by-step walkthrough of how to do the experiment with specific references to amounts of reactants, glassware used, and other experimental details (iii) A summation of the data collected after doing the experiment, with comments on accuracy and precision if possible. (iv) A detailed list of chemicals that will be used (v) Waste disposal procedures (vi) A brief scientific explanation of the predicted results. Said another way, the hypothesis should include a scientific explanation of why the predicted results are expected. 1 2 3 4 5A man went door to door posing as a goldsmith He promised to bring back the glitter of the old and dull ornaments An unsuspecting lady gave a set of gold bangles to himwhich he dipped in a particular solution The bangles sparkled like new but their weight was reduced drastically The lady was upset but after a futile argument the man beat ahasty retreat Can you play the detective to find out the nature of the solution he had used?
- A study is being performed to see if there is a correlation between the concentration of chromium in the blood and a suspected disease. Blood samples from a group of volunteers with history of the disease are analyzed and compared with the results from the healthy control subjects. From the following results (Table 1), determine whether the differences between the two groups can be ascribed as chance or whether they are real at 95% confident level.Answer is provided. All I need is the solution. Thank you! A patient cuts 100-mg scored tablets to take his 50-mg prescribed daily dose. A prescription for thirty 100-mg tablets costs $45, and a prescription for thirty 50-mg tablets costs $40. The patient asked the pharmacist to weigh an uncut tablet on an electronic balance into two “halves.” The uncut tablet was found to weigh 240 mg, and the cut “halves” weighed 125 mg and 115 mg, respectively. (a) How much money did the patient save on a monthly basis by dosing with half-tablets? (b) What was the percentage error in the weight of the cut tablets compared with “exact halves”? Answer: (a) $17.50 (b) 4.2%What are the types of gravimetric methods? Give an examples where each method is used in an analysis. What is particulate gravimetry? When do we use this technique?