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Sodium dithionite also known as sodium hydrosulfite is a white crystalline powder with a weak sulfurous odor. Although it is stable in the absence of air, it decomposes in hot water and in acid solutions. The structure has been examined by Raman spectroscopy and single-crystal X-ray diffraction. A weak S-S bond is indicated by the S-S distance of pm, which is elongated by ca. Sodium dithionite is produced industrially by reduction of sulfur dioxide. Approximately , tons were produced in The sodium borohydride method obeys the following stoichiometry:. Each equivalent of H - reduces two equivalents of sulfur dioxide. Formate has also been used as the reductant. Dcpip Testr.

Theory: Photosynthesis is a process carried out in plants, in the photosynthetic organ which is the leaf.

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Dcppi These reactants then travel to the chloroplasts in the palisade cells of the leaf, where the actual process takes place. In photosynthesis there are two reactions; the light dependant reaction and the light independent reaction. The light dependant reaction takes place in thylakoids of the grana of the chloroplasts whereas the light independat takes place in the stroma. Dcpip Testr thylakoids of the chloroplasts contain pigments which can be divided into accessory and primary pigments. These pigments form light harvesting clusters which can then be divided into different photosystems, those being photosystem I and photosystem ll.

In photosystem I, the accessory pigments trap energy from the sunlight and funnel it to the primary pigment or chlorophyll a. This then becomes excited and Tewtr an electron which Dcpip Testr accepted by an electron acceptor. The electron then moves through a https://amazonia.fiocruz.br/scdp/essay/calculus-on-manifolds-amazon/medical-ethics-and-health-care.php of electron carriers arranged in order of their redox potentials. Meanwhile, the photosystem is said to be unstable as a result of chlorophyll a losing an electron. The electron then moves back down the series of electron carriers to return to stability producing energy thus A. Photosystem II differs in that the process is non cyclic i.

However, the electrons harvested from the splitting of water goes to photosystem II which would have been energized to release an electron simultaneously Dcpiip photosystem Iwhich would have been unstable. Also, the electron that left chlorophyll a from photosystem I would have passed through Dcpip Testr series of electron carriers, arranged in redox potentials, to stabilize photosystem I producing A. P are then transported to the Calvin cycle. The foil covering that tube was then removed and the exposed solution in the test tube was placed next to the article source source of Dcpip Testr lamp at a measured distance of 10 cm.

The time for taken for the blue DCPIP to turn from blue to colourless was then Tetsr and recorded. This solution was then placed link a distance of 10 cm away from the light source and the time taken for a colour change was observed and recorded. This was then placed in the dark and the aluminium foil was Dcpip Testr removed. The time taken for a colour change from blue to green was then observed and recorded.

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Diagram: Diagram 1. In this process light strikes both photosystem l and ll, the energy is funneled down by the accessory pigments to the primary pigment and this causes the primary pigment from PS l and PS ll to release an electron. The electron from PS l is accepted by an electron acceptor and then passes through a series of electron Dcpip Testr arranged in their redox potentials. NADP is therefore an electron acceptor.

As the H is picked up, this disturbs the equilibrium causing more water to split. However, Dcpip Testr Hill discovered, that isolated chloroplasts can in fact, liberate oxygen, from the equation above, in the presence of an oxidizing agent or an electron acceptor.]