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Understanding buffers and weak acids.

Ascorbic acid (vitamin C) has a pKa of 4.2 at 24 degrees Celsius. State the pH of the solution when the ratio of unprotonated to protonated forms of ascorbic acid is (a) 1:1 (b) 1:10 (c) 10:1 (d) 1:3 (e) Which form of ascorbic acid predominates at physiological pH?

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

1656

OTA ID:

102792

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Understanding Gibbs Free Energy change. Identifying reactions that are thermodynamically spontaneous.

The attached problem file shows the standard Gibbs Free Energy Change for two reactions. Considering these values, which reaction is more favoured or spontaneous? A reaction with a delta Go = 16 kcal mole-1? Or a reaction with a delta Go = -16 kcal mole-1?

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

1658

OTA ID:

102792

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Understanding how the equilibrium constant (Keq) relates to enthalpy change. Introductory thermodynamics. Attachment in Word.

Which reaction is more exothermic? A reaction with Keq=500 or a reaction with Keq=0.002?

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

1659

OTA ID:

102792

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Understanding acid strength, pKa.

Picric acid (C6H3N3O7) has a pKa of 0.3. Formic acid (CHO2H) has a pKa of 3.7. Which is the stronger acid?

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

1660

OTA ID:

102792

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Understanding acid-base chemistry.

Amide ion (H2N-) is a stronger base than the hydroxide ion (OH-). Which would you expect to be a stronger acid, NH3 or H2O? Why?

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

1661

OTA ID:

102792

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