Neutralisation：練習問題

When dilute nitric acid is added to sodium hydroxide solution, what is the correct chemical name for the salt produced?

A student is performing a neutralisation experiment by gradually adding dilute sodium hydroxide solution to a fixed volume of dilute hydrochloric acid. Which of the following correctly describes the change in the concentration of hydrogen ions (\(H^+\)) and the pH value of the mixture as the alkali is added?

If a factory waste solution has a pH of \(2\), which of the following actions would be the most precise method to neutralise it to a pH of exactly \(7\) before disposal?

When dilute sulphuric acid is added to sodium hydroxide solution, what is the correct chemical name for the salt produced?

A student is performing a neutralisation reaction by adding dilute sodium hydroxide to a flask of dilute nitric acid. What is the correct name of the salt produced in this reaction?

Write the word equation to represent the neutralisation reaction between hydrochloric acid and potassium hydroxide.

Dilute hydrochloric acid is added dropwise to sodium hydroxide solution containing phenolphthalein indicator. Describe the characteristic colour change observed during the titration and state the specific ionic reaction responsible for the neutralisation.

In a closed system, \(25.0\ g\) of potassium hydroxide solution is mixed with \(25.0\ g\) of dilute nitric acid. Predict the total mass of the products after the reaction and explain this result using a unifying concept from the curriculum.

A student is investigating the reaction between vinegar (ethanoic acid) and baking soda solution (sodium hydrogencarbonate) in the laboratory.

(a) Between these two substances, which one will have a \(pH\) value lower than 7.0? (1 point)

(b) This reaction is a type of neutralisation. Complete the following word equation by naming the two missing products:
Ethanoic acid + Sodium hydrogencarbonate \(\rightarrow\) Sodium ethanoate + ________ + ________ (1 point)

(c) If the student wants to obtain a solid sample of the salt from the resulting mixture, which separation method should be used to remove the liquid water? (1 point)

(d) Even when using common household substances like these in a laboratory, state one safety precaution that should be followed to protect your eyes. (1 point)

A student performs a neutralisation reaction by adding dilute hydrochloric acid (\(HCl\)) to a beaker containing 20 cm\(^3\) of potassium hydroxide (\(KOH\)) solution and a few drops of phenolphthalein indicator.

(a) State the initial colour of the solution in the beaker and the colour change that occurs when the exact neutralisation point is reached. (2 points)
(b) Write the word equation for this specific neutralisation reaction. (2 points)
(c) According to the naming conventions, identify the chemical name of the salt produced. (1 point)