Reaction Rate Virtual Lab

Aim

To investigate the effect of varying the concentration of $Na_2S_2O_3$ on the rate of its reaction with $HCl$.

Principle

The reaction produces insoluble sulfur precipitate:

$Na_2S_2O_{3(aq)} + 2HCl_{(aq)} \rightarrow 2NaCl_{(aq)} + S_{(s)} \downarrow + SO_{2(g)} + H_2O_{(l)}$

Higher concentration means more particles per unit volume, leading to more frequent successful collisions.

Procedure

1. 1. Select the volume of Thiosulfate and Water to vary the concentration.
2. 2. Place the flask over the black 'X' marker.
3. 3. Add $10\text{ mL}$ of $HCl$ and start the stopclock.
4. 4. Monitor the cross; stop the clock when it is no longer visible.