2020 free Neco chemistry practical answers
2020 free Neco chemistry practical answers


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Final Burret reading (cm³)18.0015.6017.4020.50
Initial burret reading (cm³)
Volume of acid used (cm³)18.0015.6015.4015.50



Titrations |Rough|1st |2nd |3rd |
Final burette reading |18.00|15.60|17.40|20.50|
Initial burette reading |0.00 |0.00 |2.00 |5.00 |
volume of Acide used |18.00|15.60|15.40|15.50|

Average volume of Acid used
VA = (VA1 + VA2 + VA3)cm³/3
VA = (15.60+15.40+15.50)/3
VA = 46.50/3 
VA = 15.50cm³


0.1moldm-³ x 15.50cm3/CB x 25cm3 x 2/1
CB x 25cm3 x 2 = 0.1moldm-³ x 15.50cm3 x 1
CB x 50 = 1.55
CB = 1.55/50 = 0.031moldm-³


concentration in mold-³ =Con glm^³ /molar mass



OBSERVATION: C dissolves in water
INFERENCE: C is a soluble salt

OBSERVATION: White precipitate formed
INFERENCE: CO3²-, SO3²-, SO4²- suspected

OBSERVATION: White ppt dissolves in excess of dil HCl
INFERENCE: CO3²- , SO3²- suspected

OBERSVATION: Effervescence occurs with the evolution of a gas
INFERENCE: CO3²- present

OBERSVATION: Solutions turns to pink
INFERENCE: CO3²- Confirmed


Zinc Chloride(ZnCl2) solution reacts with NaOH(aq) to form white ppt in drops. The precipitate dissolves in excess of NaOH. 

Sodium hydroxide reacts with ammoniumtrioxocarbonate(iv) to form a solution which turns red litmus paper blue. 

Calcium trioxonitrate(v) Ca(NO3)2 on reaction with sodium hydroxide forms a white powder precipitate insoluble in excess NaOH(aq)

I. Liquid substances - Boiling point of the substances. 
II. Solid substances - The melting point of the substance. 

(i) Evaporation takes place at almost all temperatures, while Boiling takes place at a specific temperature. 
(ii) Only the surface of a liquid is involved in evaporation while the entire mass of the liquid is involved in boiling. 

Carbon(iv)oxide does not support combustion. 

A molar solution is an aqueous solution that contains one mole of solute in 1000cm³ of the solution. 


(i) Methyl orange
(ii) Phenolphthalein