Dilutions And Solutions Worksheet printable pdf download

Dilutions And Solutions Worksheet

Biology 324

Dilutions and Solutions

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For lab work, you have to be able to make up solutions. Somehow, this process is often

perceived as ranging from difficult to impossible. This first lab will introduce you to the

calculations that are employed to make solutions. Don't be too disheartened if it seems

difficult. By the end of the quarter, you will be a walking abacus when it concerns

making solutions.

Most working laboratory solutions are expressed in terms of molar concentrations.

Question 1) What is a mole?

Note that if a solution is a % solution, it refers to the number of grams per total of 100

ml. For example, a 15% SDS solution is made by adding 15 grams of SDS to a total

volume of 100 ml.

Most chemicals give their gram/molecular weight on the bottle. From the

gram/molecular weight you should be able to figure out how much mass of a given

chemical you need to make up any given molar solution.

Example 1)

NaCl gram/molecular weight is 58.5 g.

To make 1 liter of a 1.0 molar NaCl solution, 58.5 g of NaCl is dissolved in a total of 1.0

liter of water.

Question 2) How much NaCl is needed to make a 100 ml of a 1.0 M solution?

Question 3) How much NaCl is needed to make 100 ml of a 5.0 M solution?

Dilution handout

Dilutions And Solutions Worksheet