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Circle the sentences that are true.

(A) Strong bases have a higher concentration of hydronium ions than pure water.
(B) Strong bases dissociate almost completely in water.
(C) Strong bases have a pH below 7.
(D) Examples of strong bases include sodium hydroxide and calcium hydroxide.

User Simusid
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1 Answer

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Final answer:

The true statements regarding strong bases are that they dissociate almost completely in water, and examples include sodium hydroxide and calcium hydroxide. Statements claiming that strong bases have a higher concentration of hydronium ions than water or a pH below 7 are false.

Step-by-step explanation:

The sentences from the question that are true regarding strong bases are as follows:

  • (B) Strong bases dissociate almost completely in water.
  • (D) Examples of strong bases include sodium hydroxide and calcium hydroxide.

The incorrect statements are:

  • (A) Strong bases actually have a lower concentration of hydronium ions than pure water, not higher.
  • (C) Strong bases have a pH above 7, not below 7. A pH below 7 would indicate an acidic solution.

Strong bases, such as NaOH and Ca(OH)2, dissociate nearly completely in water, yielding a high concentration of OH- ions, which is the opposite of hydronium ions. The dissociation makes them strong electrolytes and thus gives them a high pH, typically well above the neutral pH of 7.

User Kevin Goff
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9.2k points
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