Karteikarten
Buffers flashcards
Karten in diesem Stapel (9)
- 1What makes this a buffer solution?It has approximately equal concentrations of a weak acid and its conjugate base
- 2Describe two methods of preparing an ammonia/ammonium buffer1. Mix similar amounts of ammonia and ammonium chloride (or nitrate) solution together
2. Add half the amount of ammonia to a solution containing ammonium ions. - 3What does a buffer solution do?It minimises change in pH on the addition of small amounts of either acid or base
- 4In a buffer solution of HA and A-, what reaction would occur if acid was added?The weak base A- would react with the added acid producing HA and water
- 5—This diagram represents the way a buffer system responds to the addition of a small amount of NaOH
- 6What does this diagram show?That when acid is added to a buffer system, the acid reacts with the conjugate base and when base is added to a buffer system, this base reacts with the conjugate acid.
- 7Why is pH = pKa at half equivalence?Because the concentration of the weak acid and its conjugate base are equal and at that point log 1 = 0
- 8What is the equation you should use when calculating PH of a buffer solutionpH = pka + log ([CB]÷[A])
- 9—
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- Karteikarten am Buffers flashcards, erstellt von Tanya Haywood am 23/09/2015.
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- Tanya Haywood
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