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Form 3 Chemistry Paper 3 End of Term 2 Examination 2022

Class: Form 3

Subject: Chemistry

Level: High School

Exam Category: Form 3 End Term 2 Exams

Document Type: Pdf

Views: 361 Downloads: 61

Exam Summary

1. You are provided with:
- Solution A – containing 21.2g per litre of anhydrous sodium carbonate (Na2CO3(s))
- Solution B – Nitric (V) acid solution
- Solution C – metal hydroxide M(OH)x
Procedure 1
i) Fill the burette with solution B
ii) Using a pipette, transfer 25cm3 of solution A into a clean conical flask and add 1-2 drops of methyl orange indicator.
iii) Titrate with solution B from burette.
iv) Repeat the titration to obtain accurate results and record the data in the table below. (4 marks)

a) Find the average volume of solution B used. (1 mark)
b) Given that the equation for the reaction is

Calculate; (i) The number of moles of sodium carbonate in 25 cm3 of solution A (4 marks)
(ii) The number of moles of the acid in the titre volume obtained. (2 marks)
c) Hence find the molarity of nitric (V) acid solution B. (2 marks)
Procedure II
i) Pipette 25cm3 of solution C into a clean conical flask.
ii) Add 1-2 drops of methyl orange indicator.
iii) Titrate with solution b.
iv) Repeat the titration to obtain accurate results and fill the table below. (4 marks)

a) Find the average titre volume of solution B used. (1 mark)
b) Calculate;
i) The number of moles of solution B used in the reacting volume. (2 marks)
ii) The number of moles of solution C in 25cm3 of the solution. (2 marks)
c) Determine the equation for the reaction between the hydroxide M(OH)x and nitric (V) acid. (3marks)
d) What is the value of x in M(OH)x ? (2 marks)
2. You are provided with Solid F. You are required to carry out the tests on it and make relevant observation and inferences in the spaces provided.
a) (i) Take whole of Solid F and put in dry test tube and heat strongly. Test any gases evolved using blue and red litmus papers. Allow the residue to cool then use in step II.

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