AgNO3: 1.7 g in 500 cm3 of water NaOH: 2 g in 250 cm3 of water NH3: 10 ml in 20 ml of water. You can still increase the volume of water but make the NH3 solution moderately concentrated for effectiveness. Reagents especially NaOH and NH3 should be prepared freshly as they are required for optimum results while AgNO3 should be stored in amber coloured reagent bottles to minimize light decomposition
Good afternoon sir. Is it any inorganic salt that is used as C or you already know the salt to be used? Because I don't understand quantitative analysis or salt analysis.
Thank you so much sir for this I want to ask a question, how do I prepare sodalime, even though it will be not be use in the practical, I just want to prepare it since it's part of the requirements I will appreciate a reply Sir Thank you sir How many grams am I mixing in 100cm or 200cm in water
Thanks for your comment. You can prepare a standard solution of soda lime by dissolving 8 g of soda lime in 250 cm3 of water or 32 g in 1000 cm3 of water. Soda lime is a mixture of sodium hydroxide and calcium hydroxide. Equal (intimate) mixture of the two compounds can also give you soda lime.
Review the question and take your time to understand the video. C is a simple inorganic salt. Do you expect a normal salt to contain two cations or did you watch the confirmation of the Chloride anion?
4 g of NaOH in 500 cm3 of water will give you a moderately concentrated solution of 0.2 M. Prepare freshly at the time of use due to it's deliquescent nature.
Please, in this NECO white paper, we are asked to provide soda lime. What test can it be for. I am a Chemistry teacher . And how can it be prepared. Thanks
He is not wrong. You can not pronounce an ion without mentioning its valency or charge whether fixed or variable is inconsequential. Who gave you this rule? Based on what you are saying, so you go ahead and write Zb ion and Al ion as it sounds from your mouth. Don't correct someone that knows more than you.
@@benedictanyanwu3976 Thanks for the reply Boss. When you are pronouncing chemistry terms, it should sound literal. This is practical lecture to fundamental students and not theory. Excluding the oxidation states of metals that have constant states can work in their compounds Eg ZnCl2 pronounced as Zinc chloride. Zinc (II) Chloride is also acceptable being specific Al2O3 pronounced Aluminium oxide, similarly being specific Aluminium (III) oxide is acceptable. However when the metals exist as separate cations, you can't pronounce them without mentioning their oxidation states ( the charges are the oxidation states not valency, they are two different things) Zn2+ is pronounced Zinc (II) ion not Zinc ion and Al3+ is pronounced Aluminium (III) ion not Aluminium ion (read my lips). Zinc ion could probably make a student write Zn+, Zn2+, Zn3+ etc, similarl explanation applies to Al3+ ion. This will jeopardize the student's chance of scoring. His point is more like telling a student to go and write "Zinc ion" and Aluminium ion" without specifying their oxidation states under the inference column thus making the student to loose his marks He is advised to gatecrash into WAEC and NECO coordinaton and markings late June and July respectively and learn more because he appears to be a new hand in the field and has been reading textbooks and online source materials without proper guidance. Quad Erat Demonstradium Thanks once again🎉😊
@@opec1989 Thanks for your correct observation and comment. It was an oversight from us. D is to be provided as a solution so there would be no need to dissolve D in water
Thank you very much sir, God bless you
You are welcome
Such a distilled knowledge. Thanks
We appreciate
So much appreciate sir.God bless you
You are welcome
Thanks for your wonderful lesson.
We appreciate your comment. Thanks
Thank you so much God bless you
We appreciate
What are the specifications that you used to prepare ammonia, trioxonitrate(v) and sodium hydroxide reagent.
AgNO3: 1.7 g in 500 cm3 of water
NaOH: 2 g in 250 cm3 of water
NH3: 10 ml in 20 ml of water. You can still increase the volume of water but make the NH3 solution moderately concentrated for effectiveness.
Reagents especially NaOH and NH3 should be prepared freshly as they are required for optimum results while AgNO3 should be stored in amber coloured reagent bottles to minimize light decomposition
@@bestsciencebrainthanks A million.
Hope 2M is OK for making acid bench reagents.
Well done,good work
We appreciate
Good afternoon sir.
Is it any inorganic salt that is used as C or you already know the salt to be used? Because I don't understand quantitative analysis or salt analysis.
The analysis shows confirms the salt. From the analysis C contains Zn2+ and Cl- ions. So C is ZnCl2
Hello. Is Neco chemistry specimen for 2024 out already?
100%
What test can it be use for ie the soda lime
I don't see its relevance here. Thanks
Thank u so much
If u can answer me fast
Which salt are we testing for
Is it two inorganic salt
C is ZnCl2: Zinc chloride.
D is not a salt. D is a solution of powdered milk. Thanks
Ohk tnx
I just understand now
There is no AgNO3 in the reagents provided
It doesn't matter. You are expected to have all common laboratory reagents available. Thanks
What of the soda lime ,where do we use it
Question has been dropped. Screen our videos
Question has been dropped. Screen our videos
I think ammonia should evolve on heating if protein is present
Are you saying something practicable or what you think??
You really need a bottle of wine and a plate of food 😂😂 for this , thanks a million times.
Thanks we appreciate
Thank you so much sir for this
I want to ask a question, how do I prepare sodalime, even though it will be not be use in the practical, I just want to prepare it since it's part of the requirements
I will appreciate a reply Sir
Thank you sir
How many grams am I mixing in 100cm or 200cm in water
Thanks for your comment. You can prepare a standard solution of soda lime by dissolving 8 g of soda lime in 250 cm3 of water or 32 g in 1000 cm3 of water.
Soda lime is a mixture of sodium hydroxide and calcium hydroxide. Equal (intimate) mixture of the two compounds can also give you soda lime.
@@bestsciencebrain thank you so much Sir for the reply I really appreciate🙏
That means 4g of sodium hydroxide and 4g of calcium hydroxide
Thanks for the good work.
We appreciate
Sir thank you very much.pls am a teacher.i.l want to know if D is the normal powdered milk that we drink
You are welcome. D is normal powered milk but you are going to make a solution of it and provide it as a solution to the students.
What salt is that C?
Check your comments and the reply.
Volume of CO2 gas liberated at s.t
P is 0.0137
Under what context. We don't understand what you are talking about
How did you know?
How do I know what???
Know the questions
Why is it only Zn2+ confirmed
Review the question and take your time to understand the video. C is a simple inorganic salt. Do you expect a normal salt to contain two cations or did you watch the confirmation of the Chloride anion?
How can i prepare Aq NaOH
4 g of NaOH in 500 cm3 of water will give you a moderately concentrated solution of 0.2 M. Prepare freshly at the time of use due to it's deliquescent nature.
Can we also use this 0.2M concentration to prepare other aqueous reagents?
Check your comment, it has been replied
Please, in this NECO white paper, we are asked to provide soda lime. What test can it be for. I am a Chemistry teacher . And how can it be prepared. Thanks
Thanks. Soda lime can be used to absorb CO2. I don't see its relevance in the provided specimen.
Thank you sir. Can l get your phone number please
I think we can use NaOH in place of sodalime
Zinc ion, aluminum ion, and not zinc (ii)ion ,or aluminum (iii)ion.
Zinc and aluminum are not having variable valency.
He is not wrong. You can not pronounce an ion without mentioning its valency or charge whether fixed or variable is inconsequential.
Who gave you this rule? Based on what you are saying, so you go ahead and write Zb ion and Al ion as it sounds from your mouth. Don't correct someone that knows more than you.
@@benedictanyanwu3976 Thanks for the reply Boss. When you are pronouncing chemistry terms, it should sound literal. This is practical lecture to fundamental students and not theory.
Excluding the oxidation states of metals that have constant states can work in their compounds Eg
ZnCl2 pronounced as Zinc chloride. Zinc (II) Chloride is also acceptable being specific
Al2O3 pronounced Aluminium oxide, similarly being specific Aluminium (III) oxide is acceptable.
However when the metals exist as separate cations, you can't pronounce them without mentioning their oxidation states ( the charges are the oxidation states not valency, they are two different things)
Zn2+ is pronounced Zinc (II) ion not Zinc ion and Al3+ is pronounced Aluminium (III) ion not Aluminium ion (read my lips).
Zinc ion could probably make a student write Zn+, Zn2+, Zn3+ etc, similarl explanation applies to Al3+ ion. This will jeopardize the student's chance of scoring. His point is more like telling a student to go and write "Zinc ion" and Aluminium ion" without specifying their oxidation states under the inference column thus making the student to loose his marks
He is advised to gatecrash into WAEC and NECO coordinaton and markings late June and July respectively and learn more because he appears to be a new hand in the field and has been reading textbooks and online source materials without proper guidance. Quad Erat Demonstradium
Thanks once again🎉😊
For Specimen D, teachers were asked to provide students with a solution of D, do you think they will ask the students again to add 2cm3 of water?
@@opec1989
Thanks for your correct observation and comment. It was an oversight from us. D is to be provided as a solution so there would be no need to dissolve D in water
Sodium dioxozincate and sodium tetraoxozincate. During your explanation you made a slip of the tongue.