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Chapter 22: Problem 86

Hydrogen fluoride can be prepared by the action of sulfuric acid on sodium fluoride. Explain why hydrogen bromide cannot be prepared by the action of the same acid on sodium bromide.

Short Answer

Expert verified
Hydrogen bromide cannot be produced by the action of sulfuric acid on sodium bromide because HBr is a stronger acid than H2SO4. A stronger acid cannot be prepared from a weaker acid.

Step by step solution

01

Analyzing Reactions

Begin by analyzing the reaction between sulfuric acid and sodium fluoride: \n\n\( NaF + H_2SO_4 \rightarrow HF + NaHSO_4 \) \n\nHydrogen fluoride (HF) is produced which is a weaker acid than the sulfuric acid used.
02

Predicting Reactions

Now try to predict the reaction between sulfuric acid and sodium bromide:\n\n\( NaBr + H_2SO_4 ?\rightarrow \)\n\nOne might think that Hydrogen bromide (HBr) would be produced, because it matches the pattern of the first reaction.
03

Understanding Chemical Properties

However, Hydrogen bromide (HBr) cannot be produced. This is because HBr is a stronger acid than sulfuric acid (H2SO4). In general, a stronger acid cannot be prepared from a weaker acid. So the reaction does not happen.

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Most popular questions from this chapter

A few drops of concentrated ammonia solution added to a calcium bicarbonate solution cause a white precipitate to form. Write a balanced equation for the reaction.

Unlike \(\mathrm{CaCO}_{3}, \mathrm{Na}_{2} \mathrm{CO}_{3}\) does not readily yield \(\mathrm{CO}_{2}\) when heated. On the other hand, \(\mathrm{NaHCO}_{3}\) undergoes thermal decomposition to produce \(\mathrm{CO}_{2}\) and \(\mathrm{Na}_{2} \mathrm{CO}_{3}\). (a) Write a balanced equation for the reaction. (b) How would you test for the \(\mathrm{CO}_{2}\) evolved? [Hint: Treat the gas with limewater, an aqueous solution of \(\left.\mathrm{Ca}(\mathrm{OH})_{2} .\right]\)

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