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多选题
标定 HCl 溶液常用的基准物有
A
A、 无水 Na2CO3 ;
B
B、 硼砂（ Na2B4O7·10H2O ）;
C
C、 草酸（ H2C2O4·2H2O ）
D
D、 CaCO3;
答案解析
正确答案：AB
解析：
标定 HCl 溶液常用的基准物有
Answer: AB
Analysis: This question asks for the standard substances commonly used for the calibration of hydrochloric acid (HCl) solution. The correct answers are A and B.
A: Anhydrous sodium carbonate (Na2CO3) is one of the standard substances used for acid-base titrations, including the calibration of HCl.
B: Borax (Na2B4O7·10H2O) is another standard substance commonly used for the calibration of HCl.
In summary, these questions are related to the standard substances used for pH and acid-base titrations, and the correct answers are determined based on the commonly accepted practices in laboratory settings.
