You have a test tube which contains a 10 ml suspension of white blood cells, at a concentration of 1.25 x 10⁶ cells/ml.

You need a 5 ml suspension at a concentration of 5 x 10⁴ cells.

What volume of the original suspension will you need to make this sample? (Provide your answers in μl, but you don't need to include units in your answer.)

You have 345 ml of a 5M solution of NaCl.  You need to make 10 ml of a 0.25M solution for one of your experiments. 

How much of the 5M solution will you need in mls to make up this solution?  (You do not need to include the units in your answer.)

You have  8 ml of cells at a concentration of 7.2 x 10⁷ cells/ml.

You need to make up a sample of these cells where the final concentration of cells is 5.5 x 10⁵ cells/ml in a volume of 8 mls.

What volume of cells will you need to make this sample?

You have 3 ml of cells at a concentration of 4.8 x 10⁸ cells/ml.

You need to make up a sample of these cells where the final concentration of cells is 8.5 x 10⁵ cells/ml in a volume of 10 mls.

What volume of cells will you need to make this sample?

You have 1 litre of a 2M solution of sucrose.  You need to make 300 ml of a 0.6M solution. 

What volume of the 2M solution of sucrose will you need in mls to make up this solution?  (You do not need to include the units in your answer.)

You need to dilute some pure (100%) ethanol to make a 70% (v/v) solution for disinfecting your work area.

You will make 180ml of your 70% (v/v) solution.  How much pure ethanol will you need in ml?  (You do not need to include units in your answer.)

You have 5 ml of cells at a concentration of 4.5 x 10⁶ cells/ml.

You need to make up a sample of these cells where the final concentration of cells is 6 x 10⁴ cells/ml, in a volume of 9 mls.

What volume of cells will you need to make this sample?

You are asked to make a 300 ml solution of salt that is 15% (w/v).  

How much salt do you need to make this solution?  Provide your answer in grams.  (You do not need to include units in your answer.)

You are asked to make 600ml of buffer which requires boric acid at a 3.5% (w/v) concentration.

How much boric acid do you need.  Provide your answer in grams.  (You do not need to include units in your answer.) 

You are asked to make a 140 ml solution of salt that is 15% (w/v).  

How much salt do you need to make this solution?  Provide your answer in grams.  (You do not need to include units in your answer.)