Microfluidic element for thoroughly mixing a liquid with a reagent

A method for providing a homogeneous thoroughly mixed liquid comprising:

• providing a microfluidic element having a substrate and a channel structure, wherein the channel structure includes an elongate mixing channel and an output channel, wherein the mixing channel has an inlet opening and an outlet opening in fluid communication with the output channel, and wherein the outlet opening is located closer to the middle of the length of the mixing channel than the inlet opening;
• allowing a flow of liquid through the inlet opening into the mixing channel;
• dissolving a reagent contained in the mixing channel;
• exerting a force on the liquid in the mixing channel;
• and
• allowing the liquid to flow into the output channel through the outlet opening of the mixing channel so that thorough mixing of the liquid and the reagent occur.