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.
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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.
The pH of 0.5 mol/L NaCN is ?
A. 11.45.
B. 5.10.
C. 10.90.
D. 7.40.
Which of the following statements about acid-base reaction is incorrect?
Acid-base reaction is a proton transfer reaction.
B. Substances produced by acid-base reactions are also acid-base.
C. Amphoteric substances can react with acids or bases.
D. Any acid-base reaction can be used for acid-base titration.
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