Why isn’t the concentration of the sodium hydroxide standard solution used for the ammonium sulfate mother liquor 0.1 mol/L?

The main components of the ammonium sulfide mother liquor are hydrogen sulfide and ammonia. Sodium hydroxide standard solution is used to determine the acidity of the ammonium sulfide mother liquor, with the content of acidic substances in this liquor being determined through a titration reaction. Generally, in a titration reaction, a moderate reaction rate between the titrant and the substance being titrated is required to achieve accurate measurement. If the concentration of the sodium hydroxide standard solution is too high, then each drop of the sodium hydroxide solution consumes more acidic substance, resulting in a faster titration rate; this may make it difficult to accurately determine the end point of the titration. If the concentration of the sodium hydroxide standard solution is too low, the reaction rate will be slow, which may result in a larger titration volume being required to reach the endpoint, increasing the likelihood of errors. For ammonium sulfate mother liquor, due to its high content of acidic substances, a standard sodium hydroxide solution of higher concentration is required to ensure a moderate rate of the titration reaction and accurate and reliable titration results. Therefore, the concentration of the sodium hydroxide standard solution commonly used to measure the acidity of ammonium sulfate mother liquor in coking production is typically 0.525 mol/L. This concentration is chosen to meet the requirements of the titration reaction, in order to ensure the accuracy of the measurement results. .