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4 marksBuffers and pH

CAPE Chemistry Unit 1 · 2015 · Paper 2 · Question 5(c)

Many chemical reactions occur in living systems such as the human body.

Discuss the importance of biological buffers to the maintenance of a healthy body. (Include an example of a chemical reaction of a blood buffer.)

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  1. 5(a)Using the buffer system mentioned above, describe how the solution maintains an almost constant pH even when small amounts of acid or alkali are added to the…[6 marks]
  2. 5(b)Calculate the pH of a soft drink in which the major buffer ingredients are 6.5 g of NaH₂PO₄ and 8.0 g of Na₂HPO₄ per 355 cm³ of solution.[5 marks]

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