Chemistry 20
A standard solution is any solution whose concentration is accurately known. Dilution involves the addition of solvent to a solution in order to decrease its concentration. For aqueous solutions, water is added to dilute the solution. This increases the overall volume without affecting the amount of dissolved solute.
The stock solution is the more concentrated solution that is being diluted. It is generally a standard solution. By diluting a solution carefully and with accurate measurements, the dilute solution will also be a standard solution.
300 mL of water is added to 17.2 mL of 5.14 mol/L HBr (aq). Calculate the resulting concentration.
0.278 mol/L
For a class experiment, a teacher must prepare 1.00 L of mol/L sulfuric acid, H 2 SO 4(aq). This acid is usually sold as a 17.8 mol/L concentrated solution. How much of the concentrated solution should be used to make a new solution with the correct concentration?
9.55 mL
30.0 mL of a stock solution of CaCl 2(aq) is diluted to a total volume of mL. The dilute solution is analyzed and found to have a concentration of 15.8 mmol/L. What was the molarity of the stock solution?
0.263 mol/L
The two common ways of preparing a standard solution include: dissolving a measured mass of pure solute in a certain volume of solution diluting a stock solution by adding a known volume of solvent
When dissolving a measured mass of pure solute, the steps to follow are: Calculate the mass of solute that will need to be measured out. Measure out this mass of solute accurately with an electronic balance. Dissolve the solute in a minimum volume of water. Transfer solution into a volumetric flask that is half-filled with water. Fill the volumetric flask with water up to the calibration line. Stopper the flask and mix the solution. VCGWg VCGWg
How would a mol/L solution of lithium nitrate be properly prepared by dissolving the solid chemical?
mass of LiNO 3 = g
When diluting a stock solution, the steps to follow are: Calculate the volume of stock solution that will need to be measured. Measure out this volume of solution accurately with a pipette. Transfer solution into a volumetric flask that is half-filled with water. Fill the volumetric flask with water up to the calibration line. Stopper the flask and mix the solution. vNEoVo vNEoVo
How would a mol/L solution of acetic acid be properly prepared by dilution of a 3.50 mol/L stock solution?
62.9 mL
Dilution and Standard Solutions Practice Questions Solutions Quiz Wednesday