JAMB CBT Software 2024 - Free Download
JAMB 2024 Whatsapp Group - Join us here

1992 WAEC Chemistry Practical (a)(i) Define a standard solution (ii) Give the reason why a standard solution of sodium hydroxide...

Chemistry
WAEC 1992

(a)(i) Define a standard solution

(ii) Give the reason why a standard solution of sodium hydroxide cannot be made by weighing out accurately a given mass of the solid and making it up to the required volume of solution

 

(b) Give two ways by which a solid solute can be made to dissolve more quickly in a liquid Solvent

(i) Draw a labelled diagram of the apparatus used for drying solids in the laboratory

 

(c) State what would be observed if a fresh precipitate of silver chloride was;

(i) Exposed to light.

(ii) Shaken will excess aqueous ammonia

JAMB CBT 2024 - Candidates, Schools, Centres, Resellers - Get Ready!
JAMB CBT Mobile App 2024 - Free Download
JAMB CBT Software 2024 - Free Download
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
JAMB 2024 Whatsapp Group - Join us here
Explanation

(a) A standard solution is one whose concentration is known.

(i) Sodium hydroxide is deliquescent ie. absorbs water or CO\(_2\), from the atmosphere and this would add to the weight hence cannot be used as a primary standard. 2NaOH\(_{(s)}\) + 9H\(_2\)O + CO\(^2\) \(\to\) Na\(_2\)CO\(_3\) + 10H\(_2\)O.

 

(b)(i)

-By grinding to powder

-Heating dnd shaking

-Stirring vigorously.

 

(ii) 

Open Photo

(c) It will turn from white to grey

(ii) The precipitate will dissolve to give a colour solution.


Report an Error Ask A Question Download App
JAMB CBT Mobile App 2024 - Free Download
JAMB CBT Software 2024 - Free Download
JAMB CBT 2024 - Candidates, Schools, Centres, Resellers - Get Ready!
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
JAMB 2024 Whatsapp Group - Join us here

Contributions ({{ comment_count }})

Please wait...

{{ settings.no_comment_msg ? settings.no_comment_msg : 'There are no comments' }}

Quick Questions

Post your Contribution

Please don't post or ask to join a "Group" or "Whatsapp Group" as a comment. It will be deleted. To join or start a group, please click here

{{ quote.posted_by.display_name }}
{{ settings.form_textarea_description }}
 
JAMB CBT Mobile App 2024 - Free Download
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
JAMB CBT Software 2024 - Free Download
JAMB 2024 Whatsapp Group - Join us here
JAMB CBT 2024 - Candidates, Schools, Centres, Resellers - Get Ready!
JAMB CBT 2024 - Candidates, Schools, Centres, Resellers - Get Ready!
JAMB 2024 Whatsapp Group - Join us here
JAMB CBT Software 2024 - Free Download
JAMB CBT Mobile App 2024 - Free Download