Question 14 Which of the following pairs is incorrectly matched? A microbalance : +/- 1X 10-4 g B microbalance: +/- 0.1 ug top loading balance : +/- 10 mg analytical balance : +/- 0.0001 g
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- I got a task in analytical chemistry to calibrate, standardize, verify and validate an analytical balances, can you help me?I got a task in analytical chemistry to calibrate, standardize, verify and validate an analytical balancesidea how gravimetric analysis provides accurate results despite of it being time consuming
- Using a 10mL pipette, you prepare a standard solution by pipetting 10.00mL of the standard iron solution [0.25g/L] into a 100mL volumetric flask. Then, using a 25mL pipette you transfer a 25mL aliquot of this solution into a 250mL volumetric flask and dilute up to the mark. Calculate the % uncertaintyUsing a 25mL pipette, you prepare a standard solution by pipetting 25.00mL of the standard iron solution[0.25g/L] into a 500mL volumetric flask. Then, using a 10mL pipette you transfer a 4mL aliquot of this solution into a 50mL volumetric flask and dilute up to the mark. Calculate the % uncertainty.Q4 (a) Analyze the importance of dropping mercury electrode on polarography. (b) (i) Calculate the molarity of MgSO4 in a solution containing 1.5 g ofMgSO4 in a volume of 250 mL?(ii) Calculate the weight of MgSO4 in grams which is present in 100mL of 0.076 M MgSO4?(c) Evaluate the key differences between paper chromatography and gaschromatography
- A patient has a deep vein thrombosis (DVT) and needs to be given tinzaparin at a dose of 175units/kg. The patient weights 68 kg. What dose does he need? The strengh(concentration) of tinzaparin available is 20000 units/mL. How many mL should the patient receive?(show work)Question 2 (b) Name and discuss five stages in which gravimetric analysis procedure may be dividedA 50.00 (±0.03) mL portion of an HCl solution required 29.71(±0.03) mL of 0.01963(±0.0030) M Ba(OH)2 to reach an end point with bromocresol green indicator. The molar concentration of the HCl is calculated using the equation below (attached image): a.) Calculate the uncertainty of the result (absolute error). M=0.02333(±?????) M b.) Calculate the coefficient of variation for the result. CV= (Sy/y) x 100%
- Give typed full explanation After heating 1.1929g CaCO3 and MgCO3 for some minutes the mass of the mixture decreased to 0.8015. The %comp of CaCO3 turned out to be 54.29% and MgCO3 %comp is 45.71%. Calculate the percent error/percent yield.Cat Noir was tasked to determine the concentration of a CuSO4 unknown solution. She prepared 5 different standards of CuSO4 using the table below as her guide. She ran the standards and the unknown solution in the UV-VIS Spectrophometer, and recorded the absorbances of each solution. Show linear equation derived from calibration curve and solution to concentration of the unknown solution below. Encircle final answer. Cuvette Volume 0.5000 M CuSO4 Volume distilled H2O Absorbance 1 1.000 mL 4.000 mL 0.607 2 2.000 mL 3.000 mL 0.655 3 3.000 mL 2.000 mL 0.709 4 4.000 mL 1.000 mL 0.797 5 5.000 mL 0.000 mL 0.832 Blank 0.000 mL 5.000 mL 0.000 Unknown solution 0.684Which of the following are equivalent to 2,500 ppm Cu2+? (There may be more than one answer) MW: Cu (63.55) a) 2.5 ppb Cu2+ b) 2,500,000 ppb Cu c) 2.5 ppt Cu2+ d) 39.34 mM e) 0.03934 M f) 0.07868 N (in precipitation reaction) g) 0.07868 N (in redox into Cu+)