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1. Please hide your replies; editing after posting is ineffective! Delete directly without hiding! 2. Hiding method: http://bbs.hcbbs.com/thread-492556-1-1.html 3. There is a reward for participation; those who answer correctly will receive 5 wealth points. Title: The common standard substance used for calibrating sodium hydroxide solutions is ( ). A. Sodium bicarbonate B. Borax C. Potassium hydrogen phthalate D. Hydrochloric acid. Answer to the previous question: 1. The common feature of atomic absorption spectroscopy and emission spectroscopy is that both make use of atomic spectra. (√) 2. Internationally, it is now universally accepted to use the standard hydrogen electrode as a reference, with the potential of the standard hydrogen electrode defined as 0. (√) This probably doesn’t need to be analyzed.
Reply 1# *ngguanglueguo C
Reply 1# *ngguanglueguo C. Potassium hydrogen phthalate