Concentration: Molarity and Mass per Volume

A lab protocol calls for 250 mL of a 0.5 M NaCl solution. You have a 2 M stock solution of NaCl available. Using the dilution equation, $M_1V_1 = M_2V_2$, what volume of the stock solution is needed to prepare the required solution?

You need to prepare 100 mL of a 0.1 M solution of potassium permanganate (KMnO₄) from a solid. Using an online molarity calculator, you determine that you need 1.58 grams of KMnO₄. Briefly outline the steps you would take to prepare this solution accurately.

A researcher wants to prepare 50 mL of a 100 ppm (parts per million) solution of copper sulfate (CuSO₄) using a mass per volume calculation. If ppm is defined as mg/L, how many milligrams of CuSO₄ are needed?

A solution is prepared by dissolving 25 g of glucose in enough water to make 500 mL of solution. Calculate the concentration in terms of mass/volume percentage (m/v %)

You have a 50% (w/w) stock solution of acetic acid. You need to prepare 100g of a 10% (w/w) solution. What mass of the stock solution do you need?

You are asked to prepare a series of dilutions from a 1.0 M stock solution of a dye. You need 10 mL each of 0.5 M, 0.25 M, and 0.125 M solutions. Describe a serial dilution method to efficiently prepare these solutions using a single set of steps.

A chemist needs to prepare 500 mL of a 0.2 M solution of hydrochloric acid (HCl) from a concentrated 12 M stock solution. What volume of the concentrated HCl is required?

A solution of sodium hydroxide (NaOH) is prepared by dissolving 8.0 grams of NaOH in water and diluting to a final volume of 200 mL. Using an online calculator, determine the molarity of the solution.

A solution is labeled as 5% (w/v) glucose. How would you prepare 250 mL of this solution?

You have a stock solution of 1000 ppm of a certain dye. Describe how to prepare 100 mL of a 50 ppm solution using this stock.