It is expirement lab , explain with magic number if you are not good enough in p

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It is expirement lab , explain with magic number if you are not good enough in prediction Soil Respiration OBJECTIVES a To gain additional experience with acid base titration and the determination of pht. b. To determine the amount of Co 2 produced through biological activity in a sample of soil BACKGROUND Soil respiration refers to the production of carbon dioxide as a result of biological activity in the soil by microorganisms, live roots, and macroorganisms such as earthworms, nematodes, and insects. respiration is essentially the reverse of the process of photosynthesis. In photosynthesis, carbon dioxide The process of carbon dioxide and water are combined, using energy from sunlight, to form a variety of organic compounds. In greatly simpitied form, the process can be represented by the equation nco, + n H,O + energy (sunight) C,H,0. + no, These initial compounds containing carbon and hydrogen and oxygen in a 2:1 ratio, the same as in water, are compounds, such as carbohydrates, as a source of energy for various life processes referred to as carbo( carbon)hydrates(water), In respiration, the solorganisms noted above use the organic referred to as carbo( carbon )hydrates(water). In respiration, the soil organisms noted above use the organic C,Hao, + n°2 nco, + n H,0 + energy One result of soil respiration is the breakdown of organic residues, releasing nutrients for plant growth. This nutrient turnover is an essential component of soil quality. On the other hand, the breakdown of stable organic matter and loss of soil carbon can be have a detrimental effect on many soil properties. Thus there is some optimum soil respiration rate that balances the benefits of nutrient turnover against excessive loss of soil organic matter In this experiment the rate of solil respiration willbe gauged by measuring the CO , produced over a one week period from a 100 g sample of sol period from a 100 g sample of soil. The pH of soil has a major effect on the availability of the nutrients in the soil for plant growth. Most plants grow best if the soil is very slightly acidic. For example, corn grows best on soils with a pH in the range 6.0-6.5, while soybeans do best when the pH is 6.5-6.9. In the eastern United States, soils are typically acidic and the pH is adjusted upwards by adding limestone, while in the westerm United states soils tend to be alkaline and the pH is adjusted downward by adding aluminum sulfate

Explanation / Answer

The general methods for calculation is:

The blank titration,

the blank conc. of NaOH (Cb) = conc. of HCl x Vol. of HCl needed/ Vol. of NaOH taken

The incubation titration,

the incubation conc. of NaOH (Ci) = conc. of HCl x Vol. of HCl needed/ Vol. of NaOH taken

therefore the decrease in conc. of NaOH = Cb - Ci

Hence, moles of CO2 released = moles of NaOH reacted/ 2 = (Cb - Ci) x (10.0/ 2 x 1000) mol.

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