Neco Model Questions Vol1 2024 Chemistry Question 2

Practice practical question 2 from the 2024 Neco Model Questions Vol1 Chemistry examination. This question covers Periodic Table .

Neco Model Questions Vol1 2024 Chemistry Practical
Topic: Periodic Table
Question 2 NECO_MODEL_QUESTIONS_VOL1 • 2024 • CHEMISTRY • practical

A student prepares 100 mL of 0.10 M aqueous solutions of three metal nitrates: Mg(NO₃)₂, Al(NO₃)₃ and Ca(NO₃)₂. The solutions are labelled Mg²⁺, Al³⁺ and Ca²⁺ respectively. Conductivity of each solution is measured at 25 °C using a calibrated conductivity meter. The recorded specific conductivities (κ) are: • Mg²⁺ solution: 0.025 mS·cm⁻¹ • Al³⁺ solution: 0.045 mS·cm⁻¹ • Ca²⁺ solution: 0.018 mS·cm⁻¹ Answer the following questions.

Question Parts

( a )
Explain why the conductivities differ even though the three solutions have the same molarity.
( b )
Rank the three metal ions in order of (i) ionic charge and (ii) approximate ionic radius, and predict the order of conductivity based on these trends.
( c )
Calculate the molar conductivity (Λₘ) for each solution and discuss how the calculated values support the periodic trends observed in part (b). (Use Λₘ = κ / c, where κ is in S·cm⁻¹ and c = 0.10 mol·L⁻¹ = 1.0 × 10⁻⁴ mol·cm⁻³.)

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About This Question

This is Neco Model Questions Vol1 2024 Chemistry Question 2. It is one of the practical questions from the 2024 Neco Model Questions Vol1 Chemistry examination.

The question covers Periodic Table .

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