ap chemistry – Flashcards
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Pure water contains
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water molcules, hydronium ions, and hydroxide ions
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Pure water partially breaks down into charged particles in a process called
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self-ionization
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What is the concentration of H3O+ ions in pure water?
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10^-7 M
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What is the concentration of OH- ions in pure water?
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10^-7 M
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Which expression represents the pH of a solution?
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-log [H3O+]
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If [H3O+] of a solution is greater than [OH-], the solution
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is always acidic
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If [H3O+] of a solution is less than [OH-], the solution
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is always basic
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The pH scale in general use ranges from
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0 to 14
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The pH of a basic solution is
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greater than 7
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A water solution whose pH is 10
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is always basic
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A water solution whose pH is 7
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is always neurtal
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To calculate the pH of a solution whose [OH-] is known, first calculate
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[H3O+]
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What is the pH of a 10^-4 M HCL solution?
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4
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What is the pH of a 10^-5 M KOH solution?
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9
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Dyes with pH-sensitive colors are used as
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indicators
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The pH range over which an indicator changes color is its
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transition interval
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Indicators are classified into three types according to
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the pH at which they change color
