Essay On Photosynthesis

1305 Words 6 Pages
Over the past year in 2016, the highest average temperature recorded on Earth was experienced 1. Many researchers believe this to be partially because of greenhouse gasses, including carbon dioxide 2. However, carbon dioxide is essential for the photosynthesis of plants, allowing plants to be successful autotrophs by using carbon dioxide, water, and energy from the sun to produce glucose and oxygen. One of the main sources of photosynthesis in a plant is in the leaves. When leaves decompose they release the carbon dioxide used in photosynthesis. It is important to figure out how much carbon dioxide is emitted from leaf decomposition in order for people to further limit the amount of carbon dioxide being trapped within the atmosphere.
A previous
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In order to find this amount and back titration was performed with 1.0209 M hydrochloric acid. The same reaction was used again to determine the amount of carbon dioxide emitted:
2NaOH (aq) + CO2 (g) → Na2CO3 (aq) + H2O (l) Sodium carbonate may react with the hydrochloric acid during the back titration process causing us to remove the compound with the precipitation of the carbonate ions with strontium nitrate, which allowed for hydroxide to still be present. This cause the following reaction:
Sr(NO3)2 (aq) + Na2CO3 (aq) → SrCO3 (s) + 2NaNO3 (aq) These reactions allowed for the determination of carbon dioxide emissions. For the unknown solution contains 1 M of sodium hydroxide and sodium carbonate. Phenolphthalein was added to the solution in the beaker in order to observe the changing points of the reactions. Deionized water was added to the solutions so the pH electrode was submerged and would record accurately.

Results

Table 1. The selective precipitates on NaOH- and
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Strontium nitrate, through table 1, can show how there was little to no reaction with sodium hydroxide, as it was mainly clear, and reacted with sodium carbonate as a milky substance was produced. This is representation of strontium nitrate being the best choice to act as the best precipitate, reacting with sodium carbonate and not sodium hydroxide. In Figure 1, graph A depicts the unknown solution titration where the pH begins to drop significantly at 11.3 mL of hydrochloric acid and had another significant dip at 22.5 mL. Graph B is the titration of the same unknown solution however it has strontium included in the mixture, so the solution mixture with sodium hydroxide. This curve shown in graph B is sharper than the curve represented in graph A, representing that strontium. Comparing graphs C and D, the curve of the leaf sample with fertilizer is much sharper and dips before the leaf sample with water only. This is a possible indicator of the fertilizer acting as a catalyst for the decomposition of leaves. This indication is further supported by table 2 with the overall class data, which represents the samples with fertilizer decomposed more grams of leaves each day. The standard deviation in this table is quite low which is strong evidence of similar findings between multiple studies and leaf

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