Igcse Model Questions Vol1 2024 Chemistry Question 7

Practice essay / theory question 7 from the 2024 Igcse Model Questions Vol1 Chemistry examination. This question covers Acids, Bases, Neutralisation, Titration, Salts, Hydrolysis, pH .

Igcse Model Questions Vol1 2024 Chemistry Essay / Theory
Topics: Acids Bases Neutralisation Titration Salts Hydrolysis pH
Question 7 IGCSE_MODEL_QUESTIONS_VOL1 • 2024 • CHEMISTRY • essay

A student carried out a series of experiments to investigate the neutralisation of a strong acid by a strong base and the preparation of a salt.

Question Parts

( a )
Write the balanced net ionic equation for the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH).
( b )
The student titrated 25.0 cm³ of an unknown strong acid solution with 0.100 mol dm⁻³ NaOH. The volume of NaOH required to reach the equivalence point was 31.6 cm³. Calculate the concentration of the acid solution. Show all steps and state any assumptions.
( c )
After the titration, the student evaporated the solution to dryness and obtained a white crystalline solid. Explain, with a suitable chemical equation, how the solid is formed and identify the salt.
( d )
The student then dissolved 2.00 g of the obtained salt in 100 cm³ of water and measured the pH as 8.3. Explain why the solution is basic, including the relevant hydrolysis reaction, and calculate the base‑hydrolysis constant (K_b) for the salt’s anion. (Take K_w = 1.0 × 10⁻¹⁴.)

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About This Question

This is Igcse Model Questions Vol1 2024 Chemistry Question 7. It is one of the essay questions from the 2024 Igcse Model Questions Vol1 Chemistry examination.

The question covers Acids, Bases, Neutralisation, Titration, Salts, Hydrolysis, pH .

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