0.7957 g of ferrous ammonium sulfate hexahydrate are used to prepare the 100 ppm iron solution. Following the procedure described in the lab manual, what is the actual concentration of iron (in ppm) for the 7.0 ppm standard? Assume the density of water is 1.000 g/mL and express your answer with 4 sig figs.

From your working curve, absorbance (A) is related to concentration (c) through the function: A = 0.1944c + 0.0542. You measure the absorbance of your diluted sample to be 0.604. What is the concentration of iron in the undiluted unknown? (Express your answer with 4 significant figures.)

LAB procedure:

100ppm Iron Solution. In a 400mL beaker add 5mL of ^M HCL to about 250mL of water. Dissolve 0.7022g 9f ferrous ammonium sulfate in the acidified water. Transfer to a 1000mL volumetric flask aand dilute to the mark with deionized water. Mix well.

10 ppm Iron Solution. Pipet 50 mL of 100 ppm iron solution into a 500 mL volumetric flask. Dilute to mark with deionized water and mix well.

when—without warning—something provokes your anger, you may struggle not to succumb to it. since what typically makes you mad is feeling powerless in the face of what seems unfair, your anger is mostly an attempt at a “quick fix” to right the balance. it’s as though you’re raising a fist in protest, proclaiming that you’re not going to capitulate to such injustice.

there are, however, a multitude of problems related to this immediate, push-back reaction of anger. and probably the key one is that almost never does it resolve the issue that gave rise to it. such reactive anger is probably best understood as self-defeating. as david burns, the author of the seminal self- book feeling good, observes: if realistically, acting on your anger is to make any sense, it needs to meet two criteria—which, in almost every case, is frankly impossible. that is, your anger must:

be directed toward a person who has intentionally (and needlessly) behaved in a hurtful way toward you; and

be beneficial or advantageous to you (i.e., assist you in achieving a desired goal).

i think you’ll agree that only rarely can you claim that your anger is both warranted and , whether to yourself or the relationship.

so let me offer you a two-step alternative to abandoning your better judgment and giving in to the temptation of anger—one that should neutralize your anger in seconds. or, when you’re really angry, in minutes.

but keep in mind that you must really want to execute these steps, be sufficiently motivated to perform them. which means overcoming more unconscious resistance than you might ever have imagined. because there are many immediate “advantages” of anger that can interfere with your resolve, i’ll suggest a few of them that might interfere with your employing this powerful method to rid yourself of counter-productive anger.

explanation:

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