【Daily Question】Chemical Analysis Edition, 10/19/2019
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This post was last edited by zjp on 2019-10-19 at 16:37. Those who are willing to take on responsibilities in managing industry regions are invited to reply at https://bbs.hcbbs.com/thread-2776127-1-1.html; there are generous monthly salary rewards available! Multiple-choice question: In the double-indicator method for determining mixed bases, when phenolphthalein indicator is added, the volume of HCl standard titrant required is 18.00 mL ； With methyl orange as an indicator, further titration consumed 14.98 mL of the HCl standard solution; therefore, what is present in the solution is (). A、NaOH + Na2CO3 B、Na2CO3+ NaHCO3 C、NaHCO3 D、Na2CO3. A
B、Na2CO3 + NaHCO3
Na2CO3+ NaHCO3