Influence of Temperature on the pH of Salt Solutions Based on Hand-Held Technology
GUO Yu-Lin1*, SHI Wen-Jie2, LI Ran2
1. Beijing Chaoyang District Teaching and Research Center, Beijing 100028, China;
2. High School Affiliated to University of Foreign Trade and Economics, Beijing 100102, China
Abstract Inspired by question 11 of the 2018 Beijing College Entrance Examination Chemistry Question, this paper chooses 0.1 mol·L-1 Na2SO3, Na2CO3 and NaHCO3 solutions as representatives, using the hand-held technology to measure the data of the pH changes of the three salt solutions with temperature respectively. Based on the analysis results of the experimental data, the comprehensive influence of salt hydrolysis, water ionization, oxidation-reduction reaction and heat stability on solution pH due to temperature changing are discussed.
GUO Yu-Lin, SHI Wen-Jie, LI Ran. Influence of Temperature on the pH of Salt Solutions Based on Hand-Held Technology[J]. Chinese Journal of Chemical Education, 2020, 41(19): 107-110.
