Ijmb Model Questions Vol1 2017 Chemistry Question 4

Practice practical question 4 from the 2017 Ijmb Model Questions Vol1 Chemistry examination. This question covers Mole Concept .

Ijmb Model Questions Vol1 2017 Chemistry Practical

Topic: Mole Concept

Question 4 IJMB_MODEL_QUESTIONS_VOL1 • 2017 • CHEMISTRY • practical

A 0.500 g sample of an impure sodium carbonate (Na₂CO₃) was dissolved in distilled water and the resulting solution was titrated with 0.100 M hydrochloric acid (HCl) using phenolphthalein as indicator. The titration required 23.45 mL of the acid to reach the endpoint.

Question Parts

( a )

Calculate the number of moles of HCl used in the titration.

( b )

Write the balanced chemical equation for the reaction between Na₂CO₃ and HCl and state the stoichiometric ratio between Na₂CO₃ and HCl.

( c )

Using the data above, calculate (i) the mass of pure Na₂CO₃ present in the sample and (ii) the percent purity of the sample.

( d )

Identify one source of error related to the titration procedure and one related to the sample preparation. Explain how each error would affect the calculated percent purity.

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About This Question

This is Ijmb Model Questions Vol1 2017 Chemistry Question 4. It is one of the practical questions from the 2017 Ijmb Model Questions Vol1 Chemistry examination.

The question covers Mole Concept .

View More Ijmb Model Questions Vol1 2017 Chemistry Questions More Ijmb Model Questions Vol1 Practice Questions Back to Questions

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