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1.Size- Less than 2 mm in diameter .
2.Surface area- The smaller the particle size in a given mass of soil, the greater the surface area.
3.Surface Charge- Have positive or negative electrostatic charges.
4.Adsorption of ions- Negatively charged soil colloids attract cations e.g. Al3+, Ca2+, Mg2+, K+, Na+,H+
while positively charged colloids attract anions e.g. NO3-, SO42-, Cl- 5.
5.Adsorption of water- Colloids attract and hold large number of water molecules due to the polar nature of water molecules.
jim items answered the question on October 19, 2018 at 09:49
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Date posted: October 13, 2018. Answers (1)
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Date posted: October 12, 2018. Answers (1)
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B. Bromine
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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
Date posted: August 20, 2018. Answers (1)
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Date posted: August 20, 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)
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Date posted: August 19, 2018. Answers (1)
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Heat of hydration y- = -364 kJ/mol
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Date posted: August 19, 2018. Answers (1)
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