How to use the graduated cylinder

1. How do I inject liquid into the graduated cylinder?

When injecting liquid into the graduated cylinder, hold the measuring cylinder with your left hand to make the measuring cylinder slightly inclined, and hold the reagent bottle in your right hand so that the bottle mouth is close to the measuring cylinder mouth to make the liquid flow slowly. (Graduated cylinder is coarse)

2. Which side should the scale of the graduated cylinder go?

The graduated cylinder does not have a scale of "0", and the general starting scale is 1/10 of the total volume. Many experimental diagrams in chemistry books, the scale of the graduated cylinder is carried by people, which is very inconvenient. Because the line of sight has to pass through two layers of glass and liquid, if the liquid is cloudy, the scale is even more difficult to see, and the scale number is not pleasing to the eye. So the scale is good in the face of talent.

3. When is the volume of the liquid taken read?

After injecting the liquid, wait 1~2 minutes to let the liquid attached to the inner wall flow down, and then read the scale value. Otherwise, the value read out is too small.

4. How do I read the volume of the liquid taken?

Hold the measuring cylinder in your hand so that it is naturally vertical, keep your gaze level with the lowest part of the concave liquid surface of the liquid in the measuring cylinder, and then read the volume of the liquid taken. Otherwise, the reading will be high or low.

5. Can the graduated cylinder be heated or measured with an overheated liquid?

The scale of the measuring cylinder refers to the volume number at a temperature of 20°C. As the temperature increases, the graduated cylinder expands thermally and the volume increases. It can be seen that the graduated cylinder cannot be heated, nor can it be used to measure superheated liquids, let alone carry out chemical reactions or prepare solutions in the graduated cylinder.

6. Should I rinse the graduated cylinder with water after pouring liquid from the graduated cylinder?

It depends. If only to make the measurement accurate, it is not necessary to rinse the measuring cylinder with water, because the cylinder is manufactured with residual liquid in mind. Conversely, if flushing instead makes the volume taken on the larger side. If you want to use the same measuring cylinder to measure other liquids, you must rinse them with water to prevent contamination by impurities.

Note: The measuring cylinder can generally only be used when the accuracy requirements are not very strict, usually used in qualitative analysis, generally not used for quantitative analysis, because the error of the graduated cylinder is large. The measuring cylinder generally does not need to be estimated, because the measuring cylinder is a coarse gauge, but sometimes it is also necessary to estimate, such as the ammeter in the physical electrical gauge, whether the estimation is inconclusive.