Neco Model Questions Vol1 2017 Chemistry Question 7

Practice essay / theory question 7 from the 2017 Neco Model Questions Vol1 Chemistry examination. This question covers Acids, Bases and Salts .

Neco Model Questions Vol1 2017 Chemistry Essay / Theory

Topic: Acids, Bases and Salts

Question 7 NECO_MODEL_QUESTIONS_VOL1 • 2017 • CHEMISTRY • essay

A 0.250 mol sample of the weak monoprotic acid HA (Ka = 1.8 × 10⁻⁵) is dissolved in 500.0 mL of water. To this solution 0.150 mol of its sodium salt NaA is added and the mixture is allowed to equilibrate at 25 °C. Answer the following:

Question Parts

( a )

Calculate the pH of the resulting solution. Show all steps and state any assumptions made.

( b )

The solution is to be titrated with 0.100 M HCl until the pH becomes 4.00. Calculate the exact number of moles of HCl required and the volume of the HCl solution that must be added. Show the derivation of the equation used.

( c )

Suggest a suitable indicator for monitoring this titration and justify your choice based on the pH range of colour change.

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About This Question

This is Neco Model Questions Vol1 2017 Chemistry Question 7. It is one of the essay questions from the 2017 Neco Model Questions Vol1 Chemistry examination.

The question covers Acids, Bases and Salts .

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