Reactions of acids：練習問題

What is the final stage in the laboratory preparation of a pure, dry sample of a soluble salt from an insoluble metal oxide and an acid?

(HT only) When zinc reacts with sulfuric acid, a redox reaction occurs. What is the half equation for the oxidation of zinc atoms?

(HT only) A solution of hydrochloric acid has a pH of 1.0. A solution of ethanoic acid with the same concentration has a pH of 3.0. Why is the pH of ethanoic acid higher?

In aqueous solution, what is the specific ion produced by all acids that makes them acidic?

If the pH of an aqueous solution increases from 2 to 4, how does the concentration of hydrogen ions (\( \text{H}^+ \)) change?

Which specific acid must be reacted with an alkali to produce the salt sodium nitrate?

When preparing a soluble salt from an acid and an insoluble metal oxide, why must the mixture be filtered after the reaction is complete?

Explain, in terms of electrons, why the reaction between magnesium and dilute sulfuric acid is described as a redox reaction.

Acids react with metal carbonates to produce a salt, water, and a gas.

a) Write a word equation for the reaction between calcium carbonate and hydrochloric acid.
b) Describe the chemical test used to identify the gas produced in this reaction and state the observation for a positive result.
c) Write the balanced symbol equation for this reaction, including state symbols: \( \text{CaCO}_3(\text{s}) + 2\text{HCl}(\text{aq}) \rightarrow \text{CaCl}_2(\text{aq}) + \text{H}_2\text{O}(\text{l}) + \text{CO}_2(\text{g}) \).