Dilutions Practice Problems

The illustration below represents an 8% (m/v) LiCl solution.

Determine which of the following illustrates the dilution of the above solution to 4% (m/v) LiCl solution:

Fehling's A, a copper(II) sulfate (CuSO₄) solution, is a reagent for detecting reducing sugars during syrup production. A 50.00 mL sample of CuSO₄ solution is placed in an evaporating dish weighing 59.00 g. The evaporating dish and the CuSO₄ solution have a total mass of 121.8 g. The evaporating dish with the CuSO₄ solution is placed in an oven for drying. After drying, the evaporating dish and the anhydrous CuSO₄ have a total mass of 76.72 g. If the 50.00 mL sample of CuSO₄ solution is diluted to 400.0 mL with water, calculate the concentration in mol/L of the diluted CuSO₄ solution.

A laboratory analyst is required to prepare 75.0 mL of 1.00% (m/v) copper(II) chloride solution. Bottles containing 5.00% (m/v) copper(II) chloride solution are available in the laboratory. Determine the volume (in milliliters) of 5.00% (m/v) copper(II) chloride solution needed to obtain the required solution.

Provide the final volume (in milliliters) of an 8.00% (m/v) RbCl solution obtained from the dilution of a 20.0% (m/v) RbCl solution with a volume of 40.0 mL.

Sodium nitrate (NaNO₃) is a chemical compound used in fertilizers. Determine the volume of an aqueous solution containing 475 ppm NaNO₃ required to prepare a 3.50 L solution that is 58.9 ppm in NaNO₃.

Manganese is the second most common metal in drinking water. To what volume should a 2.50 L sample of drinking water containing 8.35 ppm manganese be diluted to meet the acceptable limit of 0.0500 ppm?

A saturated solution of KCl has a concentration of 27.9 (m/v)%. Calculate the concentration of a KCl solution in (m/v)% prepared by diluting 39.7 mL of the saturated solution to 250. mL.

A solution is made by diluting 17.4 mL of 3.0 M HCI to a final volume of 930 mL, what is the concentration of the final solution?

Determine the amount of water needed to add to 20.3 mL of a 2.78 M iron (III) chloride, FeCl₃, stock solution to make a 2.50 M solution.

a) 20.9 mL

b) 22.57 mL

c) 0.28 mL

d) 2.27 mL