When do you need to weigh large samples and small samples when analyzing, measuring and weighing?

Within the allowable range of error, a small sample can be called a small sample, so that each experiment can be independent and will not be wrong several times. Then, if the error is large when weighing small samples, the error can be reduced by choosing the way of weighing large samples.

An obvious example is the calibration of 0. 1mol/L sodium hydroxide. If oxalic acid is used as reference substance, the method of weighing large samples is adopted. If potassium hydrogen phthalate is used, it is called a sample. Its molar mass is relatively large, and it can have a relatively large mass when weighing a small amount of substances, which can meet the requirement of relatively small error.

I didn't understand this until I reviewed it today. . . .