Homework Pro londonessays.com londonessays.com Concentration Exercises Tasksheet #7 Name _____________________show all work! Fall 2013 1. I need 800 mL of a 13.0 % w/v solution of glucose. How many grams of glucose are present in this solution ? 2. I would like to make a aqueous solution using 240 mL of ethylene glycol as the solute. What would the final volume of the solution have to be to have a 40% v/v concentration? 3. The EPA just checked the concentration levels of SO2 in the atmosphere in our area, and found it to be 21 ppb. If I inhale 3,500. g of air per day, how many grams of sulfur dioxide are present in this air ? 4. I want a 1.50 M solution of KNO3 in water, and I need 250 mL of it. How many grams of KNO3 are needed to prepare this solution? 5. 76.0 g of AgNO3 are dissolved in 500mL of water. What is the %w/v of this solution? What is the molarity ? 6. 25.0 mL of 18.0 M H2SO4 is transferred to a volumetric flask and filled to the 250 mL mark with distilled water. What is the final molarity? 7. 175.0 mL of a MgSO4 solution was transferred to a 500 mL volumetric flask and diluted up to the mark. If the final concentration is 1.25 M, what was the original concentration of first solution? 8. I have a 1.20 M solutio
n of Na2CO3. If I need 0.75 mol of Na2CO2 for an experiment, how many mL of this solution will I need to use ? NEW: Acid/Base Exercises Tasksheet #8 Name _____________________show all work! CHM 131 1. The [H3O+] concentration in a solution is 3.4 x 10-4 M What is the pH ? 2. 2.50 g of HBr is dissolved in 2000 mL of pure water. What is the pH ? 3. The [OH-] of a base solution is 7.3 x 10-4 M. What is the [H3O+] ? 4. The [OH-] concentration of a basic solution is 2.5 x 10-2 M. What is the pH ? 5. 2.50 g of NaOH is dissolved in 2000 mL of pure water. What is the pH ? 6. A solution has a pH of 5.79 What is the [H3O+] ? 7. A solution has a pH of 10.45. What is the [OH-] ? 8. A 35.0 mL sample of HCl is placed in flask with a few drops of indicator, and titrated with 45.9 mL of a 0.15 M NaOH hydroxide solution, at which point the indicator changed color. What was the original concentration of the HCl solution? 9. A 50.0 mL NaOH solution of unknown concentration is titrated with 34.7 mL of 0.20 M HCl. What was the original concentration of the NaOH solution ? 10. A HF/NaF buffer system was set up with [HF] = 1.00 M, and [NaF] = 1.25 M. What is the pH of this buffer? Ka of HF = 7.2 x 10-4