Phosphoric acid buffer system

What is a buffer?

• A mixture of a strong acid and a strong base that resists change to pH

• A mixture of a strong base and a weak acid that resists changes to pH

• A mixture of a strong base and a weak acid that stays at the same pH

• A type of scarf that can also be worn as a hat

Which of the following shows a acid next to its conjugate base

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Phosphoric acid is an example of a ________ acid

• Diprotic

• Monoprotic

• Triprotic

• Conjugate

The main acid present in coca cola is...

• Phosphoric acid

• Sulphuric acid

• Hydrochloric Acid

• Deoxyribonucleic acid

Which acid-base equilibrium would be present in a phosphate buffer at pH 2.85?(pKa1 = 2.12, pKa2 = 7.21, pKa3 = 12.32)

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Which acid-base equilibrium would be present in a phosphate buffer at pH 7.14?(pKa1 = 2.12, pKa2 = 7.21, pKa3 = 12.32)

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Which acid-base equilibrium would be present in a phosphate buffer at pH 12.63?(pKa1 = 2.12, pKa2 = 7.21, pKa3 = 12.32)

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At this equivalence point, all of the H₃PO_4(aq) has been consumed.

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At this equivalence point, all of the H₂PO₄^-_(aq) has been consumed.

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At this half equivalence point (at pH = pKa1 = 2.12), there is an equilibrium between H₃PO_4(aq) and H₂PO₄^-_(aq) 

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