# Dilution Calculations

## Key Questions

The more the solution of a reactant is diluted, the slower the reaction will occur.

#### Explanation:

The key thing you need to understand here is that chemical reactions depend on reactant particles bumping into each other (collision theory).

The more concentrated a reactant is, the more likely it will be to bump into other reactants and product chemical change.

Here is video of a quick lab performed to test this. In the video, varying concentrations of $N {a}_{2} {S}_{2} {O}_{3}$ are allowed to react with HCl. A timer is included in the video so you can see how the changing concentration changes the overall speed of the reaction!

video from: Noel Pauller

Hope this helps!