The reason that distilled water is boiled prior to use in preparing titration solutions is to remove dissolved CO2 which is present in all water. CO2 gas dissolved in water forms small amounts of H2CO3, or carbonic acid. Carbonic acid will alter the pH of the water, making it slightly acidic. Given that this small amount of carbonic acid can distort the results of an acid/base titration, it is common to boil the water to release as much of the CO2, thereby getting the water to around pH 7. This can be easily observed if a pH meter is placed into unboiled distilled water, the pH will be around 5-6, depending on the quality of water being used.

Thanks but my question is how do I titrate with hot liquid. The water has to be 212 degrees as it’s added to the reaction vessel and the temperature must be maintained throughout the dropwise addition.

You could coil some iron wire around the glass tube and heat it with electrical current. To stabilize the wire, as glue and as insulator you could use sodium water glass and/or clay.

Regards,

Joachim