GB/T13216-2008

GB/T13216-2008

reagent Distilled water should be boiled at least 10min to remove carbon dioxide. sodium hydroxide GB/T629),c(NaOH)=0.01mol/L Standard titration According to 4.1 solution Preparation and standard of QB/T2739-2005 hydrochloric acid (GB/T 622), c(HC L)=0.01mol/L Standard titration solution, According to 4.3 solution Preparation and standard of QB/T2739-2005 95% ethanol (GB/T 679) Phenolphthalein (GB/T 10729) indicator solution: Dissolved phenolphthalein 1.0g in 95% ethanol, 100mL solution, dropping. 0.01mol/L … Read More