You need to make an aqueous solution of 0.162 M copper(II) fluoride for an experiment in lab, using a 250 mL volumetric flask. How much solid copper(II) fluoride should you add?

hy is water an important solvent? Although you have not yet studied water in detail, can you think of some properties of water that make it so important?

Potassium permanganate (KMnO4) solutions are used for the determination of Fe2+ in samples of unknown concentration. As a laboratory assistant, you are supposed to prepare 500 mL of a 0.1000 M KMnO4 solution. What mass of KMnO4, in grams, do you need?

You have a solution of table salt in water. What happens to the salt concentration (increases, decreases, or stays the same) as the solution boils? Draw pictures to explain your answer.

94. Baking soda (sodium hydrogen carbonate. NaHCO3) is often used to neutralize spills of acids on the benchtop in the laboratory. What mass of NaHCO3 would be needed to neutralize a spill consisting of 25.2 mL of 6.01 M hydrochloric acid solution?

An experiment calls for you to use 250. mL of 1.00 M NaOH, but you are given a large bottle of 2.00 M NaOH. Describe how to make the desired volume of 1.00 M NaOH.

A student wants to prepare 1.00 L of a 1.00-M solution of NaOH (molar mass = 40.00 g/mol). If solid NaOH is available, how would the student prepare this solution? If 2.00 M NaOH is available, how would the student prepare the solution? To help ensure three significant figures in the NaOH molarity, to how many significant figures should the volumes and mass be determined?

You wish to prepare 1 L of a 0.02-M potassium iodate solution. You require that the final concentration be within 1% of 0.02 M and that the concentration must be known accurately to the fourth decimal place. How would you prepare this solution? Specify the glassware you would use, the accuracy needed for the balance, and the ranges of acceptable masses of KIO3 that can be used.

m>5. Which of the following do you need to know to calculate the molarity of a salt solution? (There may be more than one answer.) the mass of salt added the molar mass of the salt the volume of water added the total volume of the solution plain your answer.

As with all quantitative problems in chemistry, make sure not to get “lost in the math.” In particular, work on visualizing solutions at a molecular level. For example, consider the following. U have two separate beakers with aqueous solutions, one with 4 units of potassium sulfate and one with 3 “units” of barium nitrate. Draw molecular-level diagrams of both solutions. Draw a molecular-level diagram of the mixture of the two solutions before a reaction has taken place. Draw a molecular-level diagram of the product and solution formed after the reaction has taken place.