Preparing a standard solution

A/L Chemistry · G.C.E. Advanced Level · Grades 12–13

Aim

To prepare a standard solution of a known concentration.

Apparatus

• An analytical balance
• A volumetric flask (100/250/500 cm³)
• Distilled water and a funnel

Method

1. Calculate the mass needed, m = c × V × M.
2. Weigh the solid accurately and dissolve it in a beaker.
3. Transfer to the flask, rinsing the beaker into it.
4. Make up to the mark with water and mix well.

Conclusion

Actual concentration = mass weighed ÷ (M × V). If the weighing error is tiny the solution can be used as a standard solution.