Kuster ~ Acids, Bases and Salts ~ pH indicators

Which statement correctly describes a solution with a pH of 9?

• It has a higher concentration of H₃O⁺ than OH^– and causes litmus to turn blue.

• It has a higher concentration of OH^– than H₃O⁺ and causes litmus to turn blue.

• It has a higher concentration of H₃O⁺ than OH^– and causes methyl orange to turn yellow.

• It has a higher concentration of OH^– than H₃O⁺ and causes methyl orange to turn red.

According to Reference Table M, what is the color of the indicator methyl orange in a solution that has a pH of 2?

• blue

• yellow

• orange

• red

Which indicator is yellow in a solution with a pH of 9.8?

• methyl orange

• bromcresol green

• bromthymol blue

• thymol blue

The table below shows the color of the indicators methyl orange and litmus in two samples of the same solution.

Which pH value is consistent with the indicator results?

• 1

• 3

• 5

• 10

Which indicator, when added to a solution, changes color from yellow to blue as the pH of the solution is changed from 5.5 to 8.0?

• bromcresol green

• litmus

• bromthymol blue

• methyl orange

Which indicator is blue in a solution that has a pH of 5.6?

• bromcresol green

• bromthymol blue

• methyl orange

• thymol blue

Which solution when mixed with a drop of bromthymol blue will cause the indicator to change from blue to yellow?

• 0.1 M HCl

• 0.1 M CH₃OH

• 0.1 M NH₃

• 0.1 M NaOH

How are HNO₃(aq) and CH₃COOH(aq) similar?

• They are Arrhenius acids and they turn blue litmus red.

• They are Arrhenius acids and they turn red litmus blue.

• They are Arrhenius bases and they turn blue litmus red.

• They are Arrhenius bases and they turn red litmus blue.

A student tested a 0.1 M aqueous solution and made the following observations:

• conducts electricity

• turns blue litmus to red

• reacts with Zn(s) to produce gas bubbles

Which compound could be the solute in this solution?

• CH₃OH

• HBr

• LiBr

• LiOH

According to the Arrhenius theory, an acid is a substance that

• changes litmus from red to blue

• changes phenolphthalein from colorless to pink

• produces hydronium ions as the only positive ions in an aqueous solution

• produces hydroxide ions as the only negative ions in an aqueous solution