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19 Nov 2019

The four most abundant elements by mass in the human body are oxygen, carbon, hydrogen, and nitrogen. These four elements make up about 96% of the human body. The next four most abundant elements are calcium, phosphorus, magnesium, and potassium. Write the expected ground-state electron configuration and valence shell orbital diagram for these eight most abundant elements in the human body

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Reid WolffLv2

15 May 2019

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Can you please write out any possible pitfalls you anticipate with the experiment below?

GRAVIMETRIC DETERMINATION OF PH OSRPHORUS IN PLANT FERTILIZER 2. 2.1 INTRODUCTION nglysis is a method of quantifying an analyte through the determination of, of the analyte. In the following experiment, you will quantify the present in plant fertilizers by isolating the phosphorus content amount of phosphorus and reacting it to form a solid precipitate. This precipitate ill be measured using the and rea weich-by-difference technique and the weight of the precipitate can be used to reactions required to form the precipitate). In order for plants to grow healthy, they require these basic chemical elements (listed ine the initial amount of phosphorus in the fertilizer (by looking at the chemical below in order of importance) Carbon (C), hydrogen (H), and oxygen (O): readily obtained from water and carbon dioxide Nitrogen (N), phosphorus (P), and potassium (K): called primary macronutrients Sulfur (S), calcium (Ca), magnesium (Mg): called secondary macronutrients Boron (B), chlorine (CI), manganese (Mn), iron (Fe), zinc (Zn), copper (Cu) molybdenum (Mo): referred to as micronutrients - - Soil generally provides the macro and micronutrients, however, the primary macronutrients (N, P, and K) are so crucial for plant growth and survival, that plants can deplete soil of these nutrients during early stages of growth. Plant fertilizers are generally added to soils to provide an additional supply of the primary macronutrients and in some cases to add micronutrients). Plant fertilizer Plant fertilizers represent the amount of primany macronutrients with a 3 number label, often referred to as the N-P-K value. The N-P-K value is the mass percent of Nitrogen, P:0sj and the mass percent of potassium (in the form , the mass percent of phosphorus (in the form In Figure 2-1:Afertlier with the NPK the Green light is shown and we see the igure 2-1, a bottle of 12-55-6 value of 12-55-6 which indicates that the fertilizer is composed of 12% N, SS% P20s, and 656 Kro. fertilizer Adapted from Solomon, The reason that phosphorus okdised n S. lee A, Bates D. J. Chem. Ed. 70, 1993, 410-412 as control studies of fertilizer terilohor is expressed as P,O, and potassium is expressed as K,o is because in earier quality components of the fertilizer, P:Os sts would do gravimetric analyses after igniting samples and then measure the and K,. 10

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