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Questions and Answers
What is the primary purpose of titrating a strong acid with a strong base?
What is the primary purpose of titrating a strong acid with a strong base?
- To identify the concentration of the acid (correct)
- To determine the pH of the acid
- To produce a salt and water (correct)
- To neutralize the acid completely
What indicates the endpoint of a strong acid-strong base titration?
What indicates the endpoint of a strong acid-strong base titration?
- The formation of gas bubbles
- The volume of base added becomes constant
- A color change in the indicator used (correct)
- A sudden increase in temperature
During a titration of hydrochloric acid (HCl) with sodium hydroxide (NaOH), what is expected at the equivalence point?
During a titration of hydrochloric acid (HCl) with sodium hydroxide (NaOH), what is expected at the equivalence point?
- The solution exhibits basic characteristics
- Only water is produced without any salts
- Equal moles of HCl and NaOH have reacted (correct)
- Excess HCl remains unreacted
Which pH value is typically measured at the equivalence point of a strong acid-strong base titration?
Which pH value is typically measured at the equivalence point of a strong acid-strong base titration?
What role does the phenolphthalein indicator play in a strong acid-strong base titration?
What role does the phenolphthalein indicator play in a strong acid-strong base titration?
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Study Notes
Purpose of Titration
- Titration of a strong acid with a strong base aims to determine the concentration of the acid through neutralization, allowing for quantitative analysis of acid-base reactions.
Endpoint Indicators
- The endpoint of a strong acid-strong base titration is indicated by a distinct color change of an acid-base indicator, signaling that neutralization has occurred.
Equivalence Point Expectations
- At the equivalence point during the titration of hydrochloric acid (HCl) with sodium hydroxide (NaOH), the moles of acid equal the moles of base, resulting in a neutral solution.
pH at Equivalence Point
- The typical pH value at the equivalence point of a strong acid-strong base titration is around 7, indicating a neutral solution.
Role of Phenolphthalein Indicator
- Phenolphthalein serves as an indicator in strong acid-strong base titrations, changing color from colorless in acidic solutions to pink in basic solutions, thus visually representing the completion of the titration.
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