METHOD AND CONTAINER FOR PREPARING CONSTANT CONCENTRATION SOLUTION

PURPOSE:To make it possible to prepare a constant concn. solution without contaminating the operator's hand, by accommodating a plurality of small containers each filled with a substance to be dissolved in a large container, and applying external force to the large container from outside to rupture the small containers. CONSTITUTION:A large container 1 has an opening part 2 and a mark line 3 for displaying the internal capacity of said container is formed to the surface thereof. A large number of protrusions, which are protruded to the inner direction and have leading ends each formed into a needle shape, are formed to the inner surface of the large container 1. A plurality of small containers 5 each filled with a substance 7 to be dissolved are received in the large container 1 in a state supported by a sheet 6. In this state, external force is applied to the large container 1 from directions shown by the arrows P to deform the same and the predetermined small container 5 is ruptured. Subsequently, a required amount of a solvent is injected from the opening part 2 to dissolve the substance 7 to be dissolved.