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Post-lab 7

# Post-lab 7 - 2 O 7 solution a researcher started with 10.0...

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burgin (lcb626) – Post-lab 7 – anderson – (53245) 1 This print-out should have 4 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 4.0 points How much water (ml) does one need to add to 150.0 ml of a 6.00 M solution of sulfuric acid to prepare a 1.500 M solution of sulfuric acid? 1. 450 ml 2. 500 ml 3. 400 ml 4. 750 ml 5. 800 ml 6. 700 ml 7. 600 ml 8. 650 ml 9. 550 ml 002 4.0 points 10.0 ml of a 0.0920 g/L Cr 3+ (aq) solution is transferred to a 25.0 ml volumetric flask and enough deionized water is added to bring the total volume of solution to the 25.0 ml mark. Then 5.00 ml of the prepared solution is mixed with 10.0 ml of deionized water. Calculate the molarity of Cr 3+ (aq) in the final solution. Answer in units of M. 003 6.0 points To obtain a 0.00380 M K 2 Cr 2
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Unformatted text preview: 2 O 7 solution, a researcher started with 10.0 ml oF a concen-trated K 2 Cr 2 O 7 solution and mixed it with 50.0 ml oF deionized water. Then he diluted the obtained solution by a Factor oF 4. Calcu-late the molarity oF the original concentrated K 2 Cr 2 O 7 solution used by the researcher. Answer in units oF M. 004 6.0 points 0.4318 g oF compound A is dissolved in 150.0 ml oF solution. Then 8.00 ml oF the obtained solution is transFerred into a 100.0 ml volumetric ±ask and diluted to the mark. The absorbance oF the resulting solution is measured to be 0.457 in a 0.500 cm cuvette at 470 nm. The molar absorptivity For this compound at 470 nm is 3,264 M-1 cm-1 . Cal-culate the molecular weight oF compound A. Answer in units oF g / mole....
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