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Hutton (tjh596) - Post-lab 7 - Lyon - (52535) This print-out should have 15 questions. Multiple-choice questions may continue on the next column or...

question 7

An unknown amount of water is mixed with
350 mL of a 6 M solution of NaOH solution.
A 75 mL sample of the resulting solution is
titrated to neutrality with 52.5 mL of 6 M
HCl. Calculate the concentration of the di-
luted NaOH solution.
Answer in units of M.

Hutton (tjh596) – Post-lab 7 – Lyon – (52535) 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. These questions are randomized and are di±erent From the questions in the post-lab oF other lecture sections. IF you request help via the ²acebook page, please indicate your lec- ture section and do not reFer to a question number because the number oF your question will be di±erent than the number oF the ques- tion on a peer’s assignment. Instead, write out the question and be specifc about what you do not understand in your inquiry. Note: Some numerical questions in this assignment do not consider the number oF signifcant fgures For the correct answer. It will be noted at the beginning oF the question how many sig fgs should be used in the answer I² the answer does not require the correct number oF sig fgs. 001 10.0 points IF a 0.0200 M solution exhibits 50.0% trans- mittance, what will be the percent transmit- tance For a 0.0400 M solution oF the same substance measured at the same wavelength? Answer in units oF . 0% transmittance. 002 10.0 points How much water (ml) does one need to add to 50.0 ml oF a 6.00 M solution oF sulFuric acid to prepare a 0.500 M solution oF sulFuric acid? 1. 650 ml 2. 750 ml 3. 600 ml 4. 800 ml 5. 400 ml 6. 550 ml 7. 700 ml 8. 500 ml 9. 450 ml 003 10.0 points Your answer is not determined by the correct number oF signifcant fgures in this question. ThereFore, submit your answer with six sig fgs. 10.0 ml oF a 0.0680 g/L Cr 3+ (aq) solution is transFerred to a 50.0 ml volumetric ³ask and enough deionized water is added to bring the total volume oF solution to the 50.0 ml mark. Then 20.0 ml oF the prepared solution is mixed with 60.0 ml oF deionized water. Calculate the molarity oF Cr 3+ (aq) in the fnal solution. Answer in units oF g / L. 004 10.0 points To obtain a 0.00650 M K 2 Cr 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 40.0 ml oF deionized water. Then he diluted the obtained solution by a Factor oF 5. Calcu- late the molarity oF the original concentrated K 2 Cr 2 O 7 solution used by the researcher. Answer in units oF M. 005 10.0 points 0.4518 g oF compound A is dissolved in 150.0 ml oF solution. Then 5.00 ml oF the obtained solution is transFerred into a 100.0 ml volumetric ³ask 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 4,655 M - 1 cm - 1 . Cal- culate the molecular weight oF compound A. Answer in units oF g / mole. 006 10.0 points Thomas poured 25 mL oF 0.50 M HCl into a large bottle. He then added enough water so that the new (diluted) concentration was 0.10 M HCl. How much water did Thomas add? 1. 125 mL 2. 150 mL
Hutton (tjh596) – Post-lab 7 – Lyon – (52535) 2 3. 75 mL 4. 100 mL 5. 25 mL 6. 50 mL 007 (part 1 of 2) 10.0 points An unknown amount of water is mixed with 350 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 52 . 5 mL of 6 M HCl. Calculate the concentration of the di- luted NaOH solution. Answer in units of M. 008 (part 2 of 2) 10.0 points What volume of water was added to the 350 mL of NaOH solution? Assume volumes are additive. Answer in units of mL. 009 (part 1 of 2) 10.0 points Your answer is not determined by the correct number of signiFcant Fgures in both parts of this question. Therefore, submit your answer to both parts with six sig. Fgs. A chemist dissolves 0 . 092 g of CuSO 4 · 5 H 2 O in water and dilutes the so- lution to the mark in a 500-mL volumetric ±ask. A 46 . 2-mL sample of this solution is then transferred to a second 500-mL volumet- ric ±ask and diluted. What is the molarity of CuSO 4 in the second solution? Answer in units of M. 010 (part 2 of 2) 10.0 points To prepare the second 500 mL of solution directly, what mass of CuSO 4 · 5 H 2 O would need to be weighed out? Answer in units of mg. 011 10.0 points A sample of 7 . 13 grams of NaOH is dissolved into 586 mL of aqueous 0.250 M NaOH (as- sume no volume change). This solution is then poured into 1 . 89 gallons of water. (You may assume that the two volumes can be added.) What is the concentration of NaOH in the Fnal solution? Answer in units of M. 012 (part 1 of 3) 10.0 points A compound with a molecular weight of 315 . 8 g was dissolved in a 5 . 0 mL volumetric ±ask (±ask 1) to a volume of 5 . 0 mL. A 1 . 000 mL aliquot was removed from ±ask 1 and trans- ferred to a 10 . 0 mL volumetric ±ask (±ask 2) where it was diluted to the mark. A sample from ±ask 2 had an absorbance 0 . 56 at 410 nm in a 1 . 000 cm cuvet. The molar absorp- tivity for this compound at 410 nm is ǫ 410 = 982 M - 1 cm - 1 . Calculate the concentration of compound in the cuvet. 1. 4 . 4 × 10 - 5 M 2. 5 . 7 × 10 - 4 M 3. 2 . 8 × 10 - 3 M 4. 1 . 5 × 10 - 5 M 5. 9 . 5 × 10 - 4 M 013 (part 2 of 3) 10.0 points What was the concentration of compound in ±ask 1? 1. 3 . 5 × 10 - 3 M 2. 1 . 5 × 10 - 4 M 3. 5 . 7 × 10 - 3 M 4. 4 . 9 × 10 - 2 M 5. 1 . 7 × 10 - 4 M 014 (part 3 of 3) 10.0 points How many milligrams of compound were used to make the 5 . 0 mL solution in ±ask 1? 1. 2 . 8 mg 2. 1 . 8 mg
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