Data Fill in the time and temperature for each solution: Solution Temperature ("C) Time (s) 17.9°C 1 min. 12 sec. Room Temperature Water 23.6°C 27 sec. Warm Water 7.3°C 2 min. 26 sec. Cold Water 22.8°C 52 sec. Vinegar Solution Calculations Moles of Sodium Rate Mass of Sodium Bicarbonate (moles of NaHCO, divided by time) Solution (mass divided by molar mass) Bicarbonate Room Temperature 960 mg Water Warm Water 960 mg Cold Water 960 mg 960 mg Vinegar Solution

Data Fill in the time and temperature for each solution: Solution Temperature ("C) Time (s) 17.9°C 1 min. 12 sec. Room Temperature Water 23.6°C 27 sec. Warm Water 7.3°C 2 min. 26 sec. Cold Water 22.8°C 52 sec. Vinegar Solution Calculations Moles of Sodium Rate Mass of Sodium Bicarbonate (moles of NaHCO, divided by time) Solution (mass divided by molar mass) Bicarbonate Room Temperature 960 mg Water Warm Water 960 mg Cold Water 960 mg 960 mg Vinegar Solution

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter12: Solutions

Section: Chapter Questions

Problem 12.31QE: A water solution of sodium hypochlorite (NaOCl) is used as laundry bleach. The concentration of...

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A water solution of sodium hypochlorite (NaOCl) is used as laundry bleach. The concentration of sodium hypochlorite is 0.75 m. Express this concentration as a mole fraction.
Answers should be in 4th decimal places An automobile antifreeze mixture is made by mixing equal volumes of ethylene glycol (SG=1.114; MW = 62.07 g/mole) and water at 20oC. The density of the mixture is 1.070 g/mL. Express the concentration of ethylene glycol asa) Volume percentb) Mass percentc) Molarityd) Molalitye) Mole fraction
The partial molar volumes of acetone and chloroform, in a solution in which the molar fraction of chloroform is 0.4693, are 74.166 cm3mol-1 and 80.235 cm3 mol-1, respectively. What is the volume of 1,000 kg of this solution? Data: M.M. (acetone) = 58.08 gmol-1; M.M. (chloroform) = 119.07 gmol-1.
An automobile antifreeze mixture is made by mixing equal volumes of ethylene glycol (SG= 1.114; MW = 62.07 g/mole) and water at 20oC. The density of the mixture is 1.070 g/mL. Express the concentration of ethylene glycol as:a) Volume percentb) Mass percentc) Molarityd) Molalitye) Mole fraction
The picture is 1.)A 1B.) If DHsolution for dissolving DMSO in methanol is negative, what does this say about the energy released in mixing methanol and DMSO molecules (DHmixing) as compared to the energy required in separating solute molecules from each other (DHsolute) and separating solvent molecules from each other (DHsolvent)? What can you conclude from this about the strength of DMSO-methanol interactions? Which “wins” in this case? Enthalpy? Entropy? Both? Explain
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Bristol Community College Fall River, Massachusetts Experiment 6: Molar Mass of a Molecular Solid from Freezing Point-Depression Measurement Name: __________________________________ Date: _______________ Approved: ___________ DATA SHEET Mass of lauric acid (in Part II) Mass of benzoic acid (in Part II) Freezing temperature of pure lauric acid (from Part I) data from Video 2 of Part I Freezing temperature of solution (from Part II) data from Video referenced in Part II Freezing point depression, Tf ( = Tf, lauric acid – Tf, solution) Molality (m) of solution ( Eq. 1) Moles of benzoic acid ( Eq. 2) Experimental molar mass of benzoic acid (Eq. 3) Calculate the molar mass of benzoic acid, C6H5COOH. Percent error Summary Questions A student determines…
C7H21O4NHCl(aq) + NaOH(aq) ---> C17H21O4N(aq) + H2O (l) + NaCl(aq) When a 25mL of aqueous solution that contains 62.50g of the salt is treated with NaOH, the salt is converted to pure cocaine. How much water in litres is needed additionally to dissolve the formed pure cocaine?
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Imagine that two 1-L beakers, A and B, each containingan aqueous solution of fructose (a nonvolatile sugar withmolecular weight= 180) are placed together in a box,which is then sealed. (The concentrations of the solutionsare not necessarily the same.) The temperature remainsconstant at 26°C. Initially, there is 600 mL of solution inA and 100 mL of solution in B. As the solutions stand inthe sealed box, their volumes change slowly for a while.When they stop changing, beaker A contains 400 mL andbeaker B contains 300 mL. It is then determined that thesolution in A is 1.5 M in fructose and has a density of1.10 g mL-1 .(a) What is the molar concentration of fructose in the solution in beaker B at the end? Explain.(b) Calculate the concentration of fructose in the solution in A at the start.(c) Calculate the concentration of the fructose in the solution in B at the start.(d) The vapor pressure of pure water at 26°C is 25.2 torr. What is the pressure of water vapor in…
4. A student obtained the following data:Freezing point of Lauric acid: 43.5oC Freezing point of Lauric acid containing an unknown solute: 41.2oCThe freezing point depression constant for Lauric acid: 3.9oC/molal The molality of the unknown solute is closest to: A. 0.6m B. 1.6m C. 1.7m D. 0.3m E. 2.3m F. 3.9m G. zero 5. Given the following data: Flask A with 50cm2 surface area contains 100mL of water at 25oC; Flask B with 20cm2 surface area contains 10mL of water at 55oC. In which flask does the water have a lower vapor pressure?A. flask A B. flask B C. both flasks have the same vapor pressure