I have to make a very small volume, stock solution of the detergent. like 10% 30 ul. Should I wight the required amount like 3 mg and dissolve into 30 ul or should I dissolve in less amount first like 15 ul and make the volume upto 30 ul. As its very small its hard to dissolve. In any case my question is should I keep the final volume 30 ul or I can dissolve 3 mg directly in 30 ul.