Neco 2019 Chemistry Practical Questions and Answers are now out. Click the link below to enter your password to see the answers. Don’t have a password? Read further for information on how to get it.

Click Here to Enter Password

Take Our Free Runz: Neco 2019 Chemistry Practical Answers will be posted here for free but 45 minutes after exam starts.
Take Our Paid Runz: With N300 we will send you the password to view all the answers 3 hours before exam starts. To make payment, simply buy MTN Recharge card of N300 and send it to 09067385575 . You can also do transfer to the number.

How to send the card: Type the card pin, your subjects & phone number and send to 09067385575. You can also call or message the above number for more details.

See Also: Neco 2019 Physics Practical Questions and Answers – Free Expo/ Runz

Why we are the best? We give you 24/7 customer support. We give you another subject for free if you didn’t get the answers to the one you paid for. We offer the cheapest Runz (N400 per Subject, N3000 for 9 Subjects and N5000 for all our runz). Our answers are real and genuine. We also give free Runz to candidates who cannot afford our paid Runz. Where else on the internet can you get this kind of service? Subscribe now and enjoy while it lasts!

Neco 2019 Chemistry Practical Answers – Free

Fill in the space.
(2i)
Observation;
Solution turns blue
Inference;
Copper salt suspected.
(2ii)
Observation;
Blue gelatinous precipitate
Insoluble in excess NaOH
Inference;
Cu²+ suspected
Cu²+ Confirmed
(2iii)
Observation;
Blue gelatinous precipitate
Soluble in excess NH³
Inference;
Cu2²+ Suspected
Cu²+ Confirmed
(2iv)
Observation;
White precipitate
Inference;
SO4²- Suspected
(2v)
Observation;
Precipitate insoluble in excess
Inference;
SO4²- confirmed

---

TAKE NOTE ON THIS NUMBER 1
Each school have their titre value or end point. In our solution, we used 20.40cm3.
So make sure you use ur school’s titre value. Ask your chemistry teacher. Some school got 24.50, 24.20, 22.10, 22.40, etc. Make sure your average titre value tallies with that of ur school’s. Anywhere you see 20.40 in my work, edit it and re-solve with ur school’s value.
This is very important.
Thanks.

---

(1)
The volume or pipette used 25.00cm³
In a tabular form
Titrations |rough |1st|2nd|3rd|
Final reading |21.00|41.30|20.40|40.90
Initial reading|0.00|21.00|0.00|20.40
Vol of A used |21.00|20.30|20.40|20.50
(1ai)
Average volume of A = 20.30+20.40+20.50/3
=61.2/3
=20.40cm³
(1aii)
H2X(aq) + 2NaOH(aq)–>Na2X(aq) + 2H2O(l)
(1bi)
Mass conc. of B = 1g/250cm³
= 1g/0.25dm³ = 4g/dm³
Using :
Molar conc. = mass conc./molar mass
= 4/(23+16+1) = 4/40 = 0.1mol/dm³
(1bii)
Using CAVA/CBVB = nA/nB
CA = CBVBnA/VAnB
CA = 0.1×25×1/20.4×2
Concentration of A = 0.06127mol/dm³
(1biii)
Molar mass of A = mass conc/molar conc
=4.85/0.6127
=79.15
≅ 79gmol
(1c)
(i)it might contain traces of impurities which must be removed before being weighed
(ii)it is hygroscopic which readily absorb moisture from atmosphere

---

(3ai)
phenolphthalein
(3aii)
(i) Pink
(ii) Colourless
(3aiii)
(i)To give a sharp change in colour at the end of the acid base reaction
(3aiv)
(i)the burette must be rinsed with the acid or allow it to drain after rinsing with distilled water
(ii)Air bubble must not be allowed in the burette
(3av)
Neutralization reaction
(3bi)
(i) Hofmann voltameter.
(ii) Kipp’s apparatus
(3bii)
Because silver nitrate is photosensitive (i.e.sensitive to light) Therefore,if the silver nitrate is left in sunlight or any bright light, it breaks down (hydrolyses) to give black/brown silver oxide and nitric acid.

---

Next Coming Exam: Verified Neco 2019 Government Theory & Obj Questions and Answers – Free Expo/ Runz

See Previous Neco Chemistry Practical Answers Below

Tabulate
Titrations|Rough|first(1)|second(2)|third(3)
Final burette reading-|20.50|14.90|15.00|15.10|
initial burette reading- |0.00|0.00|0.00|0.00|
volume of Acide used- |20.5|14.90|15.00|15.10|
1ai)
average volume of Acid used
1st+2nd+3rd/3
14.90+15.00+15.10/3=45/3=15cm^3
1aii)
2HCL(aq)+Na2CO3(aq)—->2NaCl(aq)+H2O(aq)+CO2(aq)
1bi)
CA VA/CB VB =NA/NB
0.1moldm^-3*15cm^3/CB*25cm^3 *2/1
CB * 25cm^3*2=0.1moldm^-3*15cm^3*1
CB * 50=1.5
CB=1.5/50=0.03moldm^-3
1bii)
25cm^3—->0.03mole
1000cm^3—->x
x=1000*0.03/25=30/25
x=1.2moldm^-3
1biii)
concentration in mold^-3 =Con glm^3 /molar mass
0.03moldm^-3=x/106
x=0.03*106
x=3.18gldm^3
CLICK HERE FOR THE no.2 IMAGE
2a)
Tabulate
2ai)
-OBSERVATION-
i)C dissolves in water
ii)formation of white precipitate
iii)White precipitate dissolves in itel
-INFERENCE-
i)C is soluble in water
ii)CO3^-2,SO4^-2,SO3^2- suspected
iii)CO3^2-,SO3^2-, suspected
2bi)
-OBERSVATION-
i)effervescence occurs with the evolution of a gas
ii)the solutions turns to pink
-INFERENCE-
i)CO3^2-,SO3^2-, suspected
ii)CO3^2-,Confrimed
CLICK HERE FOR THE no.3 IMAGE
3ai)
Zinc chloride reaction with HaOH form white gelatinous precipitate
solution in excess HaOH.
Ammonium trioxocarbonate(iv) on reaction with HaoH evolves a gas
which turns red litmus paper blue and lime water milky.
Calcium trioxocarbonate(iv) on reaction with HaoH forms white powdery
precipitate insoluble in excess HaOH.
3aii)
i)liquid substance–> crystallization
ii)Solid substance–> precipitation
3bi)
i)Evaporation takes place at all temperatures, while boiling occurs at a
particular temperatur (at boiling point).
ii)Evaporation takes place from the surface, whereas the entire liquid
boils.
3bii)
Carbon(iv)oxide does not support combustion
3ci)
molar solution is an aqueous solution that contains 1 mole (gram-
molecular weight) of solute in 1 liter of the solution.
3cii)
Indicator
3ciii)
i)methyl orange
ii)Phenolphthalein.
COMPLETED

Past NECO Chemistry Practical Answers

1ai) Methyl Orange
Reason:- Titration of strong acid against base
1aii) Yellow
1aiii)Hydrochloricacid
1aiv)2HCL(aq)+ x2Co3 -> 2 x CLaq + H20(aq) + CO2(g)

1b) Molar mass of HcL = 1+35.5
=36.5gmol^-1
Con of A is moldm^-3 =
Con of A of gdm^3/molar mass in gdm^3
=7.30gdm^-3/36.5gmol^-1
=0.200moldm^-3
1bii)
using CAVA/CBVB = a/b
CA = 0.200mol/dm^3
VA = 26.20cm^3
Cb = ?
VB = 25.0cm^3
a = 2mols
b = 1mol
0.200mol/dm^3 x 26.2cm^3/Cb x 25.0cm^3
= 2mols/1mol
Cb = 0.200×26.20×1/25.0×1
Cb = 5.24/25.0mol/dm^3
Cb = 0.2096mol/dm^3

1biii)
Conc. of B in gdm-3/Conc. of B in mol/dm-3
=10.6gdm-3/0.148 gdm-3
=101.15g
=101gmol-1
2ai)
INFERENCE:
Sample X is a soluble salt

2aii)
OBSERVATION:
A gas is evolved. The gas turns red moist litmus blue.
It forms white fumed when NaOH solution was added was added

INFERENCE:
Alkaline gas

2aiii)
INFERENCE:
CO3 gas is CO3^2-

2aiv)
INFERENCE:
The solution is alkaline

2av)
(NH4)2CO3(aq)+2NaOH(aq) >> Na2CO3(aq)+2NH3+2H2O(g)

2bi)
REAGENTS: Adition of KSCN Solution
(Fe2+): Pale-colouration
(Fe3+) Blood red colouration
2bii)
REAGENT: Addition of NaOH solution in drop till excess
(Fe2+): Dirty green gelatineous precipitaye which is insolube in excess NaOH.
(Fe3+): Reddish brown gelatineous precipitate which is insolube in excess NaOH.
2biii)
REAGENT: Addition of K2Fe(CN) solution
(Fe2+): It forms a dark blue precipitate
(Fe3+): A deep red colouration

3b)
– Burrette
– Reshort Hand
– Solution/Acid
– Conical Flask
– white tile

Check Out Other NECO Chemistry Practical Past Questions and Answers here

Tags: See All Neco GCE 2019 Chemistry Practical questions and Answers. See All Neco 2019 Chemistry expo/Runz/runs. How to get Neco 2019 Chemistry Practical answers. Verified Neco 2019 chemistry Practical Questions. Verified Neco 2019 Chemistry Practical answers/ expo/Runz/runs. Click here to see All Neco GCE 2019 Chemistry Practical Questions and answers, free expo. Free Neco 2018 Chemistry Practical questions and answers. Free Neco 2019 Chemistry Practical expo/ Runz. Earboard Runz/ expo for Neco 2019 Chemistry Practical exam. How much is Earboard Runz for Neco 2019 Chemistry Practical Questions and answers? Site to get real Neco 2019 Chemistry Runz. Site to get free Neco 2019 Chemistry practical expo. Where can I get Neco 2019 Chemistry Practical answers/expo/Runz? All Neco 2018 Chemistry Practical Runz. Paper 1 Neco Chemistry Practical answers. 2018 Neco GCE Practical Questions and answers – correct expo/Runz Runz. 100% correct Neco Chemistry Practical Questions and answers. Neco Chemistry Practical specimen. 100% correct Neco Chemistry expo/ Runz. Verified Neco Chemistry Practical answers. The only trusted site to get Neco 2018 Chemistry Practical answers. The most reliable site to get Neco Runz. All Neco 2019 chemistry specimen . Get real Neco answers from Earboard. Neco 2019 Chemistry Practical Questions and Answers – Free Expo/ Runz

Tags: Naija Education ,NECO ,Neco Expo