a)Exchangeable ions: Positively or negatively charged atoms or groups of atoms that are held on or near the surface of a solid particle by attraction to charges of the opposite sign, and which may be replaced by other like-charged ions in the soil solution.
b)Exchangeable sodium percentage: The extent to which the adsorption complex of a soil is occupied by sodium.
jim items answered the question on October 12, 2018 at 15:35
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In details describe the following terms as used in physical and biological chemistry.
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b)Bioaugmentation.
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B. Bromine
C. Chlorine
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A student was provided with the following chemicals
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•1M Sodium hydroxide
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The following are steps carried by a student during a chemistry practical to determine the concentration of an acid using a known concentration of a base. Study the steps and answer the questions that follows(note:Steps are not consecutively)
(a) Rinse conical, pipette and burette using distilled water
(b)Assemble apparatus required set them
(c) Pour HCL to a burette
(d) Put a funnel on top of a burette
(e) Open burette tap to adjust volume of acid to a mark
(f) Add three drops of phenolphthalein indicator into conical flask.
(g) Titrate burette contents(acid) against conical contents(base) until the pink colour just disappear
(h) Suck 1M sodium hydroxide using pippete
and transfer to conical flask.
(I) Record the volume of acid used and repeat the procedure.
Questions
(I)Using alphabets (a-i) give the correct order of steps
(II) Why is it necessary to add an indicator to contents in conical flask and not the ones in burette?
(III) How can one determine end point?
(Iv) Write balance equation between acid and base
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Date posted: August 19, 2018. Answers (1)
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Heat of hydration of x2+ = -1480 kJ/mol
Heat of hydration y- = -364 kJ/mol
Lattice energy of XY2 = +2112 kJ/mol
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Date posted: August 19, 2018. Answers (1)
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Date posted: August 19, 2018. Answers (1)
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Date posted: August 19, 2018. Answers (1)