Acid–base Titrations
Muhtasari
How do you find out exactly how much acid neutralises a given amount of alkali? A titration answers this with great precision, measuring volumes to a fraction of a millilitre. It is one of the most important practical techniques you will learn.
In this lesson you will learn how a titration is carried out using a burette, a pipette and an indicator, how the end-point is judged by a colour change, and how the results are used to find an unknown concentration. Careful technique is the heart of an accurate result.
Malengo
- Describe an acid-base titration to include the use of a: (a) burette (b) volumetric pipette (c) suitable indicator.
- Describe how to identify the end-point of a titration using an indicator.
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Hongera kwa kukamilisha somo la Acid–base Titrations. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.
Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.
Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.
- Which piece of apparatus delivers a precisely measured, variable volume? A. Pipette B. Burette C. Beaker D. Test tube Answer: B
- The point at which the acid exactly neutralises the alkali is the: A. Start-point B. Mid-point C. End-point D. Boiling point Answer: C
- The end-point of a titration is shown by: A. A temperature rise B. A colour change of the indicator C. Bubbles of gas D. A precipitate Answer: B
- A pipette is used to measure a: A. Variable volume B. Fixed volume C. Mass D. Temperature Answer: B
- Why is a titration usually repeated? A. To use more acid B. To obtain concordant results for accuracy C. To change the indicator D. To warm the solution Answer: B
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Vitabu Vinavyopendekezwa
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Sehemu ya kitabu
Quantitative Chemical Analysis
Describe the fundamental aspects of titrations and gravimetric analysis.
"Chemistry: Quantitative Chemical Analysis" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/4-5-quantitative-chemical-analysis. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
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