The larger the electrode potential E value, the stronger the oxidation state of the oxidized substance in the electric pair.
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Titration of HCl with NaOH should use as the acid-base indicator.
A. methyl orange
B. phenolphthalein
C. methyl red
D. all of the above
Which of the following statements about buffer solution is incorrect?
A. Buffer solutions can only be configured by acids and bases.
B. The common ion effect is the reason why the buffer solution is effective.
C. Amphoteric substances and suitable acids can prepare buffer solutions.
D. The buffer capacity of the buffer solution is related to the acid-base concentration.
Which of the following statements about the conjugate acids is incorrect?
A. The conjugate acid of NH2OH is NH3+OH.
B. The conjugate acid of H2O is H+.
C. The conjugate acid of (CH2)6N4 is (CH2)6N4H+.
D. The conjugate acid of NH3 is NH4+.
The pH of mixed solution of 300.0 mL 0.500 mol/L H3PO4 and 400.0 mL 1.00 mol/L NaOH is ?
A. 12.35.
B. 11.10.
C. 11.90.
D. 12.67.
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