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2009 WAEC Chemistry Practical (a) List three pieces of apparatus required for the evaporation of sodium chloride solution to...

Chemistry
WAEC 2009

(a) List three pieces of apparatus required for the evaporation of sodium chloride solution to dryness.

(b)(i) List two normal salts which when dissolved in water turn red litmus blue.

(ii) State the phenomenon that is responsible for the action on the litmus in (b)(i).

(c) State what would be observed on adding BaCl\(_2\) solution to a portion of a saturated Na\(_2\)CO\(_3\), followed by dilute HCI in excess.

(i) A gas Q decolourized acidified KMnO\(_4\) solution. Suggest what Q could be.

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Explanation

(a) Vaporating dish

- Bunsen Burner 

- Tripod stand / wire guaze 

 

(b)(i) Na\(_2\)CO\(_3\) 

- K\(_2\)CO\(_3\)

- CH\(_3\)COONa

(ii) hydrolysis

 

(c)(i) White precipitate, effervescence, precipitate dissolves 

(ii) SO\(_2\)/H\(_2\)S/unsaturated gaseous hydrocarbon 


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NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts