Procedure
1. Standardize the 0.0200 N sulphuric acid as described
2. Gently transfer 100.0 ml of sample into a 250 ml erlenmyer flask. N.B. This Procedure is to be done in duplicate.
3. Add 4 drops of phenolphthalein indicator to the sample. If a pink color appears,hydroxide or normal carbonate are present. If no pink color appears proceed to next titration step.
4. Titrate with the 0.0200 N sulphuric acid until the color just disappears. Record the ml of acid used.