1. (Ten Points) How much 10.0 % NaCl should I put in a15.0 ml tube if my dilution ratio is 1/20. What is the concentration of the tube.

1. (30 points) A sample of approximately 30.0% iron is dissolved in acid. In order for a good analysis to take place it has to be diluted between .0040 and .006 percent. The method chosen was to dilute in three dilutions of ten mL each. The first dilution is a 1/5, the second dilution is a 1/6 and the third dilution is a 1/4. Determine the amount of acid (the diluent) to add to tube 1 and how much 30.0% solution to add to tube 1. Determine the amount from tube 1 and the amount of acid (the diluent) to put in tube 2.Determine the amount of acid (the diluent) and the amount from tube 2 to put into tube 3. Determine the concentration of each tube. Are we in the proper range?

1. (10 points) The stock solution of 20.0% was diluted to 0.010%. What is the dilution ratio?

1. (30 points) You have a material that is 2500. ppm in water and you want to dilute it in the following sequence in a 3 tube Series dilution. Tube 1 is 15 mL and a 1/25 dilution; Tube 2 is 10 mL and and a 1/5 dilution; tube 3 is 5 mL and a 1/20 dilution. How much of what goes in each tube. What is the concentration of all the tubes?

1. (10 points) You have a sample that is analyzed at 0.00480 percent and you know that this was diluted 4.0/9000. What percent should you report as the proper concentration of the original sample?

1. Ten Points) We have a solution of NaCl in water that has a test analysis of 12.0ppm. What is the concentration that you should report as the original sample concentration if your analyzed sample is the production of a 1/10, 1/4, 1/4 three tube dilution?