Methyl orange is an indicator used for detecting the pH of acidic solutions. The red, protonated form of the indicator (HIn) dissociates into a yellow, deprotonated form (In) as shown in the reaction. The pKa for methyl orange is 3.4. HIn(aq) = H*(aq) + In¯(aq) yellow red Identify the color of a solution containing methyl orange Identify the color of a solution containing methyl orange indicator at pH 2. indicator at pH 3.4. orange yellow yellow orange red red Identify the color of a solution containing methyl orange indicator at pH 6. orange yellow red

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Chapter1: Chemical Foundations
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Methyl orange is an indicator used for detecting the pH of acidic solutions. The red, protonated form of the indicator (HIn)
dissociates into a yellow, deprotonated form (In¯) as shown in the reaction. The pKa for methyl orange is 3.4.
HIn(aq) = H*(aq) + In¯(aq)
yellow
red
Identify the color of a solution containing methyl orange
Identify the color of a solution containing methyl orange
indicator at pH 2.
indicator at pH 3.4.
orange
yellow
yellow
orange
red
red
Identify the color of a solution containing methyl orange
indicator at pH 6.
orange
yellow
red
Transcribed Image Text:Methyl orange is an indicator used for detecting the pH of acidic solutions. The red, protonated form of the indicator (HIn) dissociates into a yellow, deprotonated form (In¯) as shown in the reaction. The pKa for methyl orange is 3.4. HIn(aq) = H*(aq) + In¯(aq) yellow red Identify the color of a solution containing methyl orange Identify the color of a solution containing methyl orange indicator at pH 2. indicator at pH 3.4. orange yellow yellow orange red red Identify the color of a solution containing methyl orange indicator at pH 6. orange yellow red
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