Waec Model Questions Vol1 2019 Chemistry Question 3

Practice practical question 3 from the 2019 Waec Model Questions Vol1 Chemistry examination. This question covers Chemical Bonding .

Waec Model Questions Vol1 2019 Chemistry Practical

Topic: Chemical Bonding

Question 3 WAEC_MODEL_QUESTIONS_VOL1 • 2019 • CHEMISTRY • practical

A 0.500 g sample of an unknown solid electrolyte (X) was dissolved in distilled water to make two separate solutions of concentrations 0.010 mol dm⁻³ and 0.001 mol dm⁻³ respectively. The cell constant of the conductivity apparatus was calibrated as 0.50 cm⁻¹. The measured resistances (R) of the two solutions were: - 0.010 M solution: R = 200 Ω - 0.001 M solution: R = 1500 Ω Using the data provided, answer the following:

Question Parts

( a )

Calculate the specific conductivity (κ) of each solution in S cm⁻¹.

( b )

Calculate the molar conductivity (Λₘ) of each solution in S cm² mol⁻¹.

( c )

From the trend of Λₘ with dilution, state whether X behaves as a strong electrolyte or a weak electrolyte and, consequently, indicate the predominant type of chemical bond in X (ionic or covalent). Justify your answer in one sentence.

( d )

Suggest two possible sources of experimental error that could affect the determination of the electrolyte type.

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About This Question

This is Waec Model Questions Vol1 2019 Chemistry Question 3. It is a practical question from the 2019 Waec Model Questions Vol1 Chemistry examination.

The question covers Chemical Bonding .

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