wadzband indend SAZA FOA If you left bubbles in your column, how would that affect your results? If you put the more polar solvent into the column first, how would that affect your results?
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- 8. How would you prepare a solution with a concentration of 0.005 M of Na₂SO4 from a stock solution with a concentration of 10 M (stating any assumptions) using: a. A single dilution b. A serial dilution. How much water is used in the serial dilution? How much solution have you prepared? [Name: Date: Section: Report Sheet: Determination of Molecular Weight Through Freezing Point Depression Analysis 30 Part A: Volume of Cyclohexane mL Mass of cyclohexane (d =0.7786 g/mL) 6.0 °C Freezing Point of cyclohexane 128 Part B: Molecular Weight of Naphthalene g/mol 0.23 Mass of Sample 1 Moles of Sample 1 Mass of Sample 2 0.18 Moles of Sample 2 Moles m (mol/kg solvent) T,('C) AT, Naphthalene 5.1 TRIAL 1 5.3 TRAIL 2 k, Cyclohexane CC/m) Part C: Unknown Number 0.21 0.19 Mass of Sample 1 Mass of Sample 2 Grams Unknown T,('C) AT 0.21 4.8 TRIAL 1 0.19 5.0 TRAIL 2 Moles UnknownTRIAL 1 (moles) TRIAL 2 (moles) TRIAL 1 (g/mol)TRIAL 2 (g/mol) Molecular Weight Unknown (g/mol) AVERAGE MOLECULAR WEIGHT OF UNKNOWN7. Soru FA The diagram shows the apparatus for separating soil and water. What are the labeled parts? B O A)A= filtrate, B= residue O B)A= distillate, B= filtrate O C)A = distillate, B= residue O D)A = residue, B= distillate O E)A = residue, B= filtrate
- Which of the following detector NOT consider as solute property? O a. Conductivity O b. Mass spectrometer Oc. Photodiode array O d. Fluorescencey! how to Q What g. y zinc anc y ideal ga y What g Q What g y What g W molarit Experim ourse.html?courseld%3D15828855&HeplD=537061946710f71a192e43597b01c6e0#10301 Lab Lab Part A Why is the KMnO, solution filtered? O KMNO4 doesn't need to be filtered prior to use. O Most commercial samples contain inorganic matter that will react slowly with the KMnO, and cause its decomposition. O KMNO is very stable, but the unstable ions in the commercial packaging materials must be removed prior to use. Most commercial samples of KMnO4 contain some manganese dioxide that must be removed prior to use to avoid further decomposition. Submit Request Answer Part B Why is the KMnO, not stored in a rubber-stoppered bottle? Rubber doesnt make a good seal with the plastic bottles in which permanganate is usually stored. Rubber can oxidize the permanganate solution. P Pearson Copyright 2020 Pearson Education Inc. All righrs reserved. Terms ofUse I Prvacy Policy Permission: 40 DELL1. A 50.00 mL stock CaCl2 solution was diluted with water in a 250.0-mL volumetric flask. A 25.00 mL aliquot of this was further diluted to a final volume of 100.0 mL. Finally, 20.00-mL aliquot of the resulting solution was analyzed and found to contain 0.1500 M CaCh2 Solve for the concentration of the stock solution in M. 2. A 50.00 mL stock CaCl2 solution was diluted with water in a 250.0-mL volumetric flask. A 25.00 mL aliquot of this was further diluted to a final volume of 100.0 mL. Finally, 20.00-mL aliquot of the resulting solution was analyzed and found to contain 0.1200 g CaCl2 Solve for %w/v CaCl2 in the stock solution.
- A sample is analyzed for chloride using the Volhard method. What is the percentage chloride as NaCl using the following data? Weight of sample: 303.0 mg AgNO3 used: 40.00 mL of 0.1234 M KSCN used: 12.20 mL of 0.0930 M3. Which solution is most concentrated? (Hint: Convert all solutions to g/dL). Show your work. a. 6.7% b. 1:5 c. 8.1mg% 0-00819A reagent bottle contains 250 cm3 of 0,4 mol.dm–3 oxalic acid(C2O4H2) solution. Calculate the mass of pure oxalic acid thatmust be dissolved in this solution so that its new concentration is 0,6 mol.dm–3. Assume that the volume of the solution remainsconstant