Chem_173B_HW3_2008_Key

Chem_173B_HW3_2008_Key - Chem 173B/268B Prof S Scott...

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Chem 173B/268B Homework assignment #3 Prof. S. Scott Answer key 1. HF is a weaker acid than HCl, yet HF is more dangerous to work with than HCl. Explain both observations. The H-F bond strength is much higher than the H-Cl bond strength, and is not compensated by hydration. Thus the equilibrium constant for dissociation of HF is smaller and HF tends to remain un-ionized in water. In contrast, HCl is completely ionized in water. Neutral HF can pass through the skin, causing deep burns, unlike the highly ionized H + Cl - . HF burns are not immediately painful because HF destroys nerves, and therefore treatment may not be sought quickly. However, even small burns are extremely dangerous, because they interfere with calcium metabolism causing cardiac arrest. 2. Account for the instability of polyanions of oxygen compared to sulfur. Chains of oxygen atoms experience strong lone pair-lone pair repulsions due to the small size of O. S is larger and its lone pairs do not come into close contact in
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Chem_173B_HW3_2008_Key - Chem 173B/268B Prof S Scott...

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