Hmm! ~ ~ I've had this operation. Accurately weighing 2g oil on an electronic scale does not mean that it must be weighed to 2.0000g, but there is a range, and the formula is m (m * 10%), so it is enough to weigh1.8 ~ 2.2g. Then the weighing steps are as follows. First, put the oil into the dropping bottle, then put the dropping bottle on the electronic balance, peel it and set it to zero. Then take out the drop bottle and drop a few drops of oil into the conical bottle, and then put the drop bottle on the balance to weigh it. At this time, the weight is negative, and the operation is repeated until the weight is 1.8 ~ 2.2g ... and the data is recorded. This accurate weighing method is called "reduction method". In other words, the difference between the two weights is the mass you just dropped. This kind of operation is the basic operation skill that college chemistry must master.
It is impossible to use a pipette. The pipette measures the volume. . . And what we want is quality. . .