9. Which of the following substances, when dissolved in water, increases the concentration of hydroxide ions?
A. H3PO4
B. NaOH
C. H2O
D. CO2
Question from chemistry Acids and Bases?
2020-09-15 11:28 pm
回答 (1)
2020-09-15 11:38 pm
The answer: B. NaOH
A. false
H₃PO₄ is an acid which ionizes in water to give hydrogen ions, and thus decreases the concentration of hydroxide ions.
B. true
NaOH is a base which dissociates in water to give hydroxide ions.
C. H₂O
Both the concentrations of hydrogen ions and hydroxide ions do not change when H₂O is added to H₂O.
D. false
CO₂ dissolves in water to form a weak acid H₂CO₃ which slightly ionizes in water to give a small amount of hydrogen ions, and thus decreases the concentration of hydroxide ions.
A. false
H₃PO₄ is an acid which ionizes in water to give hydrogen ions, and thus decreases the concentration of hydroxide ions.
B. true
NaOH is a base which dissociates in water to give hydroxide ions.
C. H₂O
Both the concentrations of hydrogen ions and hydroxide ions do not change when H₂O is added to H₂O.
D. false
CO₂ dissolves in water to form a weak acid H₂CO₃ which slightly ionizes in water to give a small amount of hydrogen ions, and thus decreases the concentration of hydroxide ions.
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