OBSERVATIONS

• We committed some errors when 0.2 of solution was drawn with the pipette because we were inexperienced in the use of laboratory instruments, and because there was the capillarity phenomenon which caused some problems. When the liquid was in the pipette we assisted at the formation of meniscus, and this made difficult the reading of the notches of the instrument because it needs to consider the value tangent to the meniscus.
• The sample of the oleic acid with the pipette was easy because the pipette was adjusted at 0.1cc, so the reading was easy letting higher precision.
• The counting of the squares of graph paper would have been easier if we had considered the millimetre instead of the centimetre, but it took a lot of time so it wasn't done; or we would have taken a photo the visible graph paper (that wasn't covered by the lycopodium) with a digital camera; the result would have been elaborated with the computer.
• During the counting of the squares under the stain of the oleic acid the count was obstruched by clots of lycopodium formed on the surface of the stain
• The formation of clots of lycopodium on the surface of stain was probably caused by shocks to the basin; due to the inexperience of the executors.
• there was errors committed during the counting of the squares of the surface of the stain.
• The stain of the oleic acid didn't appear homogeneous because in the pipette there were more than 0.2 cc so we had to pay attention to not let fall more than 0.2cc of oleic acid.
• We could commit some errors during the approximation in the calculi.
• Avogadro's number we got hypotizing that a molecule is a pyramid is three times bigger than that of the cube.
• Avogadro's number we got hypotizing that a molecule is a sphere is different than the cube because the several cubes get stuck between theirselves, but the spheres don't get stuk between theirselves.
• Avogadro's number we got considering geometric figure has a relative error of the 100% so we can't accept it; the hicosahedron's relative error isn't of the 100% but it is so high we can accept it too.