Earboard Logo

Welcome, Guest: Join Earboard Forum / LOGIN! / Advertise / Contact Us
Stats: 43196 members, 38256 topics. Cached on: Sunday, 19th May 2024


2019 WAEC GCE Chemistry Alternative to Practical Answers | Free Expo

(0) (Reply) (Create New Topic) (Go Down)

2019 WAEC GCE Chemistry Alternative to Practical Answers | Free Expo by : 1:02 am On September 13, 2019

2019 WAEC GCE Chemistry Alternative to Practical Expo Answers are now available. Click on the link below to enter your password.

Click Here to Enter Password

Take Our Free Runz: 2019 WAEC GCE Chemistry Alternative to Practical Answers will be posted here for free but 60 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 N400 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.

Why we are the best? We give you 24/7 customer support. 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!

Past WAEC GCE Chemistry Practical Amswers

WAEC Official Logo

Burette Reading(cm^3)| 1 | 2 | 3 |
Final Reading |33.10|30.00|25.00|
Initial Reading | 9.60|7.50 |2.40 |
Volume of F used (cm^3)|23.50|22.50|22.60.

Average volume of F used
=22.50 + 22.60 / 2

GIVEN:Molar Conc of Kmn04 =0.200mol/dm^2
Volume of Kmn04 used =22.55cm^3
Molar Conc of FeSo4. 7H2O=?
Volume of FeSO4.7H2O=25cm^3
Mole ratio of Kmn04 =1
Mole ratio of FeSO4.7H2O=5

Molar Conc of KeSO4.7H2O x Volume(FeSo4.7H2O) =n(FeSO4.7H2O)/n(KmnO4)

=molar Conc x 25 / 0.0200 x 22.55 = 5/1

=Molar Conc. x 25=0.0200 x 22.55 x 5
=Molar Conc =0.0200 x 22.55 x 5 / 25

=Molar Conc =0.0902mol/dm^3
Hence, Concentration of FeSo4.7H2O in E = 0.0902mol/dm^3
Hydrochloric acid(HCL) is a mild reducing agent and so it will consume a certain amount of Kmn04 during titration. This will give a slightly higher value of Kmn04 consumption than the actual amount needed by the analyte

As Kmn04 is a Dees purple colour, it is not possible to take readings from the button of the meniscus on the burette as in usual. Hence, the top, of the meniscus is used(visibility consideration)

No indicator is used because Kmn04 serves as an indicator

TEST:A+distilled water and stirred
OBSERVATION:All of A dissolved to form uniform mixture
INFERENCE:A is soluble in salt
TEST:A(aq)+litmus paper
OBSERVATION:Turns blue litmus paper red
INFERENCE:A is an acidiic salt
TEST:A(aq)+NaOH(aq)- in drops,
– then in excess
OBSERVATION:-White gelatinous precicpitate,
-Precipitate soluble,dissolved
INFERENCE:-Pb^2+ or Zn^2+ present
-Al^3+ present
TEST:A(aq)+NH3(aq)- in dropss,
-In excess
OBSERVATION:-White gelatinous precipitate
-Precipitate insoluble
INFERENCE:-Pb^2+ or Zn^2+ or Al^3+
-Al^3+ present
TEST:A(aq)+FeSO4(aq)+conc H2SO4
OBSERVATION:Brown ring forms between the two solutions
INFERENCE:NO3^- confirmed
A is aluminium trioxonitrate(v)
OBSERVATION:No visible reaction is observed
INFERENCE:NaHCO3(aq) does not show result for alkanols(K)
TEST:K+benedict solution+heat
OBSERVATION:There is no change in the colour of the benedicts solution
INFERENCE:Benedicts solution is not an indicator for alkanols(K)
OBSERVATION:KMnO4(aq) solution changes from purple to colourless
INFERENCE:Alkanol is being oxidized by KMnO4
OBSERVATION:pleasant fruity smell is observed
INFERENCE:Esterification reaction has occured

-Putsome distilled water in a beaker
-Measure 100cm^3 of 2.00mol/dm^3 of the stock solution by means of a burette and pour all the solution into the beaker containing the distilled water
-Stir the solution
-Transfer the solution into a 250cm^3 volumetric flask by means of a funnel
-Ensure that all the solution in the volumetric flask has been transferred by thoroughly rinsing the inside of the beaker with distilled water
-Dilute the solution in the volumetric flask with distilled water until it reaches the 250cm^3 mark
-Shake the solution carefully
-CH3COONa:It forms basic solution
-Al2(SO4)3:Acidic solution
-KNO3:Neutral solution
Acidified potasium tetraoxomanganate(vii) KMnO4 was placed in the burette

Tags: WAEC GCE Chemistry Practical Expo, WAEC GCE 2019 Chemistry Practical Answers, WAEC GCE 2019/2020 Chemistry Practical Questions and Answers, free WAEC GCE Chemistry Practical, WAEC GCE Chemistry Practical Answers / Runz /Dubs/ Choke/ etc. 2019 WAEC GCE Chemistry Alternative to Practical Answers – Free Expo

About Flex

I am a verified author at EARBOARD.com... For any complaint or information, contact EARBOARD admin on 09067385575

Tags: ,

Leave a Reply

(0) (Reply)

Federal University of Agriculture, Zuru, Kebbi State 2022/2023 Post / Federal University of Health Technology, Otukpo Benue State 2022/2023 Post / Usumanu Danfodiyo University Sokoto UDUSOK 2022/2023 Post Utme Screening form is out /

(Go Up)

Sections: News (1) Technology Education (2)
Earboard - Copyright @ 2016 - 2024 Forumer. All rights reserved. See How To Advertise. DMCA Content Removal.
Disclaimer: Every member is solely responsible for anything that he/she posts or uploads on Earbaord.