Specify the volume of mineral water

Reference no: EM13498698

You have been asked to analyze some mineral water for magnesium by standard addition using atomic absorption (AAS). You are given 100.0 ml volumetric flasks and 1.000 ml volumetric pipettes. The mineral water has a stated value of 20 ppm Magnesium. The maximum linear reading of the AAS system is 0.300 absorbance units which occurs at 0.600 ppm of Mg.
Design a standard addition experiment using 5 flasks similar to that illustrated in Figure 5-7 of Harris. You have a 10.00 ppm stock solution of Mg. Include the following:
a. Specify the volume of mineral water to add to each of the five flasks.
b. Specify the volume of stock magnesium solution in each flask.
c. Assuming the "true" value for Mg in the mineral water is 18 ppm compute the final concentration of magnesium in each of the flasks.
d. Verify that no solution exceeds the linear range. You may do this by computing the expected absorbance of each solution from the data provided.
e. What mass of magnesium do you need to make 1.000 L of 10.00 ppm stock solution.
f. Incorporate items a - c into a short written procedure that you believe someone else could follow in the lab.

Reference no: EM13498698

Questions Cloud

What concentration of oh- : An aqueous solution containing 0.050 M Mg2+ and 0.050 M Cu2+ ions and are asked to try to separate them. What concentration of OH- is needed to begin precipitation of each cation? Ksp = 1.8 x 10-11 for Mg(OH)2; Ksp = 4.8 x 10-20 for Cu(OH)2.

Evaluate the ka and the ph of the solution : If you mix 10 mL of a 0.1 M HCl solution with 8 mL of a 0.2 M NaOH solution, what will be the resulting pH? If a weak acid, HA, is 3% dissociated in a 0.25 M solution, calculate the Ka and the pH of the solution.

Balance the equation in acidic solution and determine : Balance the equation in acidic solution and determine how much of a 0.850 M K2 Cr2 O7 solution is required to completely dissolve 5.25 g of Cu.

A flask of water is connected to a powerful vacuum pump : A flask of water is connected to a powerful vacuum pump. when the pump is turn on, the water begin to boil. after a few minutes, the same water begins to freeze. eventually, it dissapears. explain what happens at each step

Specify the volume of mineral water : Specify the volume of mineral water to add to each of the five flasks.

2 moles of co2 assuming complete combustion : 3. Concentrated acetic acid is a Class II combustible liquid. What is the molecular weight of acetic acid that will form 2 moles of CO2 assuming complete combustion?

The ammonia tests with no other sets of cations in the tray : Define amphoteric behavior and give an example of it other than the one given in your lab manual.

Symbol to separate substances in the list : Using a periodic table, arrange the following substances according to their expected lattice energies, listing them from lowest lattice energy to the highest: MgS, KI, GaN, LiBr. (Use the appropriate symbol to separate substances in the list

A constant temperature : 1. Consider a process involving 1 mole of an ideal gas that takes place by the following pathway, at a constant temperature of 25oC: P1 = 2.5 atm → P2 = 0.25 atm → P3 = 2.5 atm Both steps occur irreversibly.

User Account

All Pages