Are you looking for Waec chemistry practical questions and answers 2022/2023? Don't worry, 2022/2023 WAEC Chemistry Practical questions and answers is out.
WAEC Chemistry Practical will be held in 2022. Many WAEC applicants struggle to accurately answer the WAEC Practical Chemistry Alternative A and B questions because they don't grasp the questions. I'll show you how to answer the WAEC Chemistry Practical questions in 2022 and get a good result on your Chemistry exam.
Before tackling any questions, it is critical that you grasp the WAEC Chemistry Practical Making Scheme so that you can present your answers in such a way that they will appeal to the examiner and get you high marks.
Keep in mind that each process receives a grade. So, when reporting and presenting your practical outcomes, make sure you don't neglect any steps.
The Chemistry Practical question paper will be divided into two portions, each with a set of general chemistry questions:
- Quantitative Evaluation
- Qualitative Research
These include titration and ion tests. You will be required to conduct an experiment and submit your findings and inferences. What you'll see is very similar to the WAEC Chemistry Specimen your school received.
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Questions and Answers for WAEC Practical Chemistry (Expo)
3ai)The price will rise.
(3aii)The arise as a result of the increasing volume of water lowering the concentration of base.
(3bi)Because copper is less than zinc in the electrochemical series, there will be no observable reaction.
Because it is hygroscopic, it absorbs water and becomes sticky.
(3biii)The solution changes color to pink.
(3c)A white precipitate is generated when NaOH is added to a zn3+ solution, which later dissolves in excess NaOH due to the production of zinc.
All of your burette readings (both beginning and final) as well as the size of your pipette must be documented, but there is no need for an account experiment process. You must complete all computations in your response booklet.
1. A is a potassium tetraoxomanganate solution (VII). B is a solution of iron (II) chloride in 250cm3 containing 4.80 g of the salt. (a) Fill the burette with A. In a conical flask, pipette 20.0cm3 or 25.0cm3 of B, add 20.0cm3 of H2SO4(aq), and titrate with A. To get concordant titire values, repeat the titration. Calculate the average volume of A consumed by tabulating your results. MnO–4(aq) + 5Fe2+(aq) + 8H+(aq) > Mn2+(aq) + 5Fe3+(aq) + 4H2O is the reaction's equation (I)
(b) Calculate I the concentration of B in moldm-3; (ii) the concentration of A in moldm-3 using your results and the information supplied. (iii) quantity of Fe2+ moles in B pipetted volume [FeCI2 = 127 gmol-1] For precise observations and appropriate inferences, credit will be given for careful adherence to the illustrations. All tests, observations, and inferences must be written down in ink in the booklet at the time of execution.
2. The salts C and D are inorganic. Perform the activities below on them. Make a note of your findings and any gas(es) that have emerged. Declare your conclusions and make inferences based on the results of each test. (a) In a test tube, combine all of C and about 5cm3 pure water. Shake vigorously, then use litmus paper to test the resulting solution. Divide the mixture into three equal parts. I Add NaOH(aq) in drops to the first section, then in excess. (ii) Add NH3(aq) in drops to the second component, then in excess. (iii) Add AgNO3(aq) and HCI(aq) to the third portion (b) I In a test tube, combine all of D and around 5cm3 pure water. Shake the test tube vigorously and feel it. (ii) Add HCI to about 2cm3 of the solution (aq).
3. Describe the results of each of the following reactions in the laboratory: (a) mixing 2cm3 of bench H2SO4(aq) with 2cm3 of barium chloride solution; (b) mixing 2cm3 of dilute hydrochloric acid with 1 g of powered iron(II) sulphide (FeS); (c) mixing 2cm3 of dilute hydrochloric acid with 1 g of iron filings and allowing to stand for a
ANSWERS
MnO–4(aq) + 5Fe2+(aq) + 8H+(aq) > Mn2+(aq) + 5Fe3+(aq) + 4H2O = Mn2+(aq) + 5Fe3+(aq) + 4H2O (I)
The questions above are only for practice and have nothing to do with tomorrow's Chemistry exhibition.
Note: During the WAEC Practical Chemistry exam in 2022, the WAEC Chemistry Practical answers will be released here. To find out when the answers are posted, keep checking and reloading this page. Please remember to reload this page to see the answers.
Answers to Today's Practical Chemistry Questions
(Answers for 2021/2022)
3ai)\soxygen
(3c)
It causes the blue litmus paper to turn red.
3d
Copper(II) sulfate in its purest form is white. Because it is devoid of water, it is also known as anhydrous copper(II) sulfate. A sample of copper(II) sulfate becomes blue when water is present. The presence of water can be detected using this color change (or water vapour).
3c(i)
Silver chloride decomposes into gray metallic silver and chlorine when exposed to light. The photography technique is based on the light sensitivity of silver chloride and other silver halides, such as silver bromide and silver iodide.
3bi()
Because it changes color in a pH range of 8.3 to 10, phenolphtalein was chosen. In basic solutions, it will look pink; in acidic solutions, it will seem clear.
3c(i)
Silver chloride decomposes into gray metallic silver and chlorine when exposed to light. The photography technique is based on the light sensitivity of silver chloride and other silver halides, such as silver bromide and silver iodide.
3cii
Ammonia reacts with silver ions to form [Ag(NH3)2]+, a complex ion known as diamminesilver(I). Although this is a reversible reaction, the complex is extremely stable, and the equilibrium position is well to the right.
3d
Copper(II) sulfate in its purest form is white. Because it is devoid of water, it is also known as anhydrous copper(II) sulfate. A sample of copper(II) sulfate becomes blue when water is present. The presence of water can be detected using this color change (or water vapour).
Remember what I said: If you don't want to be a scapegoat, use your school endpoints. Your teacher will be the one to report, and any endpoint he reports will be considered accurate. While you're copying, make sure your eyes are bright. Goodluck
(1a)
Initial |0.00|15.25|30.53| Volume of acids used |15.25|15.28|15.26| Burette reading (cm)3|1st reading|2na Reading|3rd reading| Final |15.25|30.53|45.79| Initial |0.00|15.25|30.53| Initial |0.00|15.25|30.53| Initial |0.00|15.25|30.53| Initial |0.00|15.25|30.
Average acid volume utilized =15.25+15.26/2 =15.255cm3 =15.26cm3 =15.27cm3
(1b)
Given: A mass con of 5g/500cm3 = 5g/0.5dn3 CA mass con of 10g/dm3
Because A is HNO3, the molar mass is 1+14+(16*3)=15+48=63g/mol1.
CA=10/63=0.1587mol/dm3 molarity of A = gram con/molar mass
(1bii)
With the reaction equation HNO3 + NaOH—NaNO3+H2O nA=1 nB=1 0.1587*15.26/CB*25.00=1/1 25CB=0.1587*15.26 CB=0.1587*15.26/25 CB=0.09687mol/dm3
(1biii)
B stands for sodium hydroxide.
23+16+1=40g/mol molar mass
molarity * molar mass = 0.09687*40 =3.8748g/dm3 Conc of B in g/dm3
(1biv)
The number of moles in 250cm3 of NaOH is calculated as follows: =molar conc * volume =0.09687*250/1000 =0.0242moles
The mole ratio of NaOH and NaNO3 is 1:1 and the mole of reacted NaNO3 is 0.0242.
The mass of NaNO3 created is equal to the molar mass multiplied by the number of moles, which is 85*0.0242 = 2.05 grams.
(2a)
C+burning splint TEST
OBSERVATION: Sample C was engulfed in flames.
It has a non-smoky blue flame that produces no soot. There is a colorless gas present that turns wet blue litmus paper faint crimson and goes milky like water.
INFERENCE: C is combustible and volatile. CO2 is produced by the burning of a saturated organic molecule.
(2bi)
TEST: Combine C and distilled water in a shaker.
OBSERVATION: The solution is clear or colorless.
INFERENCE: C is water miscible.
TEST: C + Acidified K2Cr207 (2bii)
OBSERVATION: On cooling, the orange color of the K2Cr207 solution turns pale green, then pale blue.
IMPLICATION: C is a reducing agent.
(2C)
TESTING: D + C + 10% NaOH + Shake
OBSERVATION: D slowly dissolves in C, yielding a reddish brown solution. A yellow precipitate forms from a reddish brown solution. The precipitate smells antiseptic.
D is soluble in organic solvents, which is an inference.
(2d)
=====================================
(3ai)
Nitrate of zinc
(3aii)
2 Zinc (NO 3 )
2 ZnO + 4 NO 2 + O 2 = 2 ZnO + 4 NO 2 + O 2 = 2 ZnO + 4 NO 2 + O 2 = 2 Zn
(3aiii)
It turns white when cool after being yellow when hot.
(3b)
Pipette or measure 50.0cm3 of the stock solution into a volumetric flask with a capacity of 250 cm3 (containing some distilled water). Shake/swirl till the mark is attained, then add more distilled water.
(3c)
Al2(SO4)3 – causes litmus to turn blue.
WAEC 2021 Chemistry practical Answers
3. Each candidate should be supplied with the following, where is the
candidate's serial number
(a) 150 car of a solution of HNO, in a corked flaskor bottle, shelled
"An'. These should all be the same containing 10.0 car of
concentrated HNO, (about 7096) per dw of solution
(b) 150 cm of NaOH solution in a corked flask or bottle labelled 'Bs.
These should all be the same containing 4,0 g of NoOH per of
solution
(c) About 15.0 cm of an organic compound, propan-2-ol in a
corked specimen tube or test tube labelled 'Ch'. This must be the
same for all candidates
(d) One spatulaful of crystals of iodine in a specimen bottle labelled
Dn. This must be the same for all candidates.
4. In all cases, more materials may be issued if required.
5. The actual concentrations of A and B must be stated on the
Supervisor's Report Form. The candidates will assume that the
concentrations are exactly as stated in the question paper
6. It should be noted that schools are not allowed to amend the
information provided on the question paper or substituto any substance/solution for those specified in these instructions
ASRANGEMENT AND SERIAL NUMBERS OF CANDIDATES
7. The laboratory places should be numbered serially and the candidates
should be allotted these places strictly in the order of the index numbers. The number of every specimen supplied to each candidate
should be the same as his or her serial number & Ifa candidate is absent, his or her serial number should not be allotted
to another candidate
9. If the candidates are divided into a number of sets the serial numbers
should be continued through the sets, so that serial number is repeated.
10. At the beginning of the examination, it should be ensured that the candidates record their serial number as well as the index sumber
Tere
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