How to prepare a solution of accurate concentration? How does one accurately dose powders? I would like to know what tools are used and how.

For example, how would one apply 1 gram of a certain powder to a solution in a beaker? Specifically, how do you make sure all of your measured powder (or at least with a very small error margin), gets into the solution, without too much of the powder sticking to the spoon or other utensil.

I figured one might dip a spoon loaded with the powder in the solution, but then the solution might stick to the spoon.
This is how I did it in my analytical practicals, works for primary standards with a decent accuracy, works for everything else with a larger error. (You'd want to check concentrations with a primary standard then.)


Determine the mass of the empty volumetric flask
Prepare approximate mass of the substance you want the solution of in a beaker or watch glass or similar
Transfer the prepared substance into the volumetric flask
Determine the mass of the filled flask; the difference will give you the mass of the substance
Fill the flask with the solvent.
Given the precision of the instruments used, you can calculate the concentration quite accurately. If necessary check the concentration with another method.