A/L Chemistry question help.plzz help soon

[Slesh]

1. meka 2004 A/L gane kotasak.ona nam balanna.

menna gaana.

[Ag(NH3)2]NO3 he 0.12 mol saha NH3 2.0 mol asrutha jalaye diyakota eya 1000cm^3 k dakwa asrutha jalayen thanuka kara P drawanaya sada ganini.

Ag+(aq) + 2NH3(aq) -----> [Ag(NH3)2]+ yana prathikriyawa sadha Celsius 25 di samathuliththa niyathaya 1.7 * 10^7 mol2 dm-6 we. Celsius 25 di P drawanaye Ag+ sandranaya hoyanna.

mehemane hadanne.

K = [Ag(NH3)2+(aq)]/[Ag+(aq)][NH3]
1.7 * 10^7 mol2 dm-6 = 0.12 mol dm-3/[Ag+] * (2.0)2 mol2 dm-6

[Ag+] = 1.8 * 10^-9 mol dm-3

podi deyayi dana ganna one.meke kohomada ekakaya mol dm-3 awe?(A/L answer poth wala ehemai thiyenne) sameekaranaya sulu karahama wena ekak ne enne?mata eka pahadili karala post ekak dannako

2.meka 2005 A/l gane kotasak

menna gaana.

1*10-5 mol dm-3 jaleeya barium hydroxide drawana 100 cm^3 samaga 2.5 * 10-5 mol dm-3 jaleeya cadmium hydroxide drawana 100 cm^3 Celsius 25 di mishra kala wita oba nireekshana washayen balaporoththu wena de kumak dai sadahan karanna. Celsius 25 di
Barium Sulphate he Ksp = 1 * 10^-10 mol2 dm-6
Cadmium hydroxide Ksp = 1.2 * 10^-14 mol3 dm-9

mehemane hadanne.

[Ba2+] = 1*10-5 mol dm-3 * 100/1000 * 1000/200 =5 * 10^-6 mol dm-3

[SO42-] = 2.5 * 10^-5 * 100/1000 *1000/200 =1.25 * 10^-5 mol dm-3

emanisa aynika gunithaya = 5 * 10^-6 mol dm-3 * 1.25 * 10^-5 mol dm-3
= 6.25 * 10^-11 mol2 dm-6

emanisa Ksp(BaSO4) > 6.25 * 10^-11 mol2 dm-6

emanisa BaSO4 awakshepa nowe.

[OH-] = 2 * 10^-5 *100/1000 * 1000/200 = 1*10^-5 mol dm-3

[Cd2+] = 2.5 * 10^-5 *100/1000 * 1000/200 = 1.25 * 10^-5 mol dm-3

Cs(OH)2 ---> Cd2+ + 2 OH-

emanisa aynika gunithaya = [Cd2+][OH-]2
= 1.25 * 10^-5 mol dm-3 * (1*10^-5 mol dm-3)2
= 1.25 * 10^-15 mol3 dm-9

emanisa Ksp(Cd(OH)2) > 1.25 * 10^-15 mol3 dm-9

emanisa Cd(OH)2 awakshepa nowe.

mata dana ganna one me hadala thiyena widiya harida?and OH- sandranayata agya daanakota (nil pata thana) samekaranaye stoikiyomithiya anuwa hoyapu sandranaya 2n wadi wela nemeida ethanata daanne?(habai anwer books wala thiyenne wadi nokara)

please help soon.

 

[animation]

1. meka 2004 A/L gane kotasak.ona nam balanna.

menna gaana.

[Ag(NH3)2]NO3 he 0.12 mol saha NH3 2.0 mol asrutha jalaye diyakota eya 1000cm^3 k dakwa asrutha jalayen thanuka kara P drawanaya sada ganini.

Ag+(aq) + 2NH3(aq) -----> [Ag(NH3)2]+ yana prathikriyawa sadha Celsius 25 di samathuliththa niyathaya 1.7 * 10^7 mol2 dm-6 we. Celsius 25 di P drawanaye Ag+ sandranaya hoyanna.

mehemane hadanne.

K = [Ag(NH3)2+(aq)]/[Ag+(aq)][NH3]
1.7 * 10^7 mol2 dm-6 = 0.12 mol dm-3/[Ag+] * (2.0)2 mol2 dm-6

[Ag+] = 1.8 * 10^-9 mol dm-3

podi deyayi dana ganna one.meke kohomada ekakaya mol dm-3 awe?(A/L answer poth wala ehemai thiyenne) sameekaranaya sulu karahama wena ekak ne enne?mata eka pahadili karala post ekak dannako

2.meka 2005 A/l gane kotasak

menna gaana.

1*10-5 mol dm-3 jaleeya barium hydroxide drawana 100 cm^3 samaga 2.5 * 10-5 mol dm-3 jaleeya cadmium hydroxide drawana 100 cm^3 Celsius 25 di mishra kala wita oba nireekshana washayen balaporoththu wena de kumak dai sadahan karanna. Celsius 25 di
Barium Sulphate he Ksp = 1 * 10^-10 mol2 dm-6
Cadmium hydroxide Ksp = 1.2 * 10^-14 mol3 dm-9

mehemane hadanne.

[Ba2+] = 1*10-5 mol dm-3 * 100/1000 * 1000/200 =5 * 10^-6 mol dm-3

[SO42-] = 2.5 * 10^-5 * 100/1000 *1000/200 =1.25 * 10^-5 mol dm-3

emanisa aynika gunithaya = 5 * 10^-6 mol dm-3 * 1.25 * 10^-5 mol dm-3
= 6.25 * 10^-11 mol2 dm-6

emanisa Ksp(BaSO4) > 6.25 * 10^-11 mol2 dm-6

emanisa BaSO4 awakshepa nowe.

[OH-] = 2 * 10^-5 *100/1000 * 1000/200 = 1*10^-5 mol dm-3

[Cd2+] = 2.5 * 10^-5 *100/1000 * 1000/200 = 1.25 * 10^-5 mol dm-3

Cs(OH)2 ---> Cd2+ + 2 OH-

emanisa aynika gunithaya = [Cd2+][OH-]2
= 1.25 * 10^-5 mol dm-3 * (1*10^-5 mol dm-3)2
= 1.25 * 10^-15 mol3 dm-9

emanisa Ksp(Cd(OH)2) > 1.25 * 10^-15 mol3 dm-9

emanisa Cd(OH)2 awakshepa nowe.

mata dana ganna one me hadala thiyena widiya harida?and OH- sandranayata agya daanakota (nil pata thana) samekaranaye stoikiyomithiya anuwa hoyapu sandranaya 2n wadi wela nemeida ethanata daanne?(habai anwer books wala thiyenne wadi nokara)

please help soon.

​

 

[rcccc]

bump

 

[mottaya]

1. poddak balannam hariyata meter na...
2. thota pissuda? oya [OH-] kiyanne mulu drawanayema tyena OH- sandranaya.
eka deken guna karanne naa..

deken guna karanne me wage awastha waladi
Mg(OH)2 ---> Mg2+ + 2OH-
wage deela Mg(OH)2 saandranaya dunnoth, OH- saandranaya hoyanne 2n wadi karala..(gobba udaharanayk eth idea eka ganin)

Cd(OH)2 kiyanne hadena ekak. eke OH- "prabhawaya" Cd(OH)2 nemei ne..
OH- drawanaye tiyenne..

anit eka balannam..

 

[Mudi08]

Dan mathaka na bn owa 5 years wennwane

1. Balpan K wala ekakaya anuwa uba lyla thynna prakashanya waradi
( k = [Ag+(aq)][NH3]^2 / [Ag(NH3)2+(aq)] mehema anna one wage)

 

[mottaya]

palaweni eke gotha mistake eka weka thiyenne..
oke prashne widiyata K walata enna ona ekakaya balapan. eka enne mol-2 dm6 kiyala..
eth prashne deela thiyenne mol2 dm-6 kiyala..

oke un K kiyala deela tyenne 1/K wala ekakaya.
e nathath saandranaya ahuwama mol-4dm16 wage ekak enne naene ban.. sandranaya ahuwoth moldm-3 walin daala nikan hitu..

 

[Slesh]

1. poddak balannam hariyata meter na...
2. thota pissuda? oya [OH-] kiyanne mulu drawanayema tyena OH- sandranaya.
eka deken guna karanne naa..

deken guna karanne me wage awastha waladi
Mg(OH)2 ---> Mg2+ + 2OH-
wage deela Mg(OH)2 saandranaya dunnoth, OH- saandranaya hoyanne 2n wadi karala..(gobba udaharanayk eth idea eka ganin)

Cd(OH)2 kiyanne hadena ekak. eke OH- "prabhawaya" Cd(OH)2 nemei ne..
OH- drawanaye tiyenne..

anit eka balannam..

hari machan 2weni ekata answer eka meter..ela Thanks kollo
1weni ekata th balala kiyahanko..

 

[Slesh]

Dan mathaka na bn owa 5 years wennwane

1. Balpan K wala ekakaya anuwa uba lyla thynna prakashanya waradi
( k = [Ag+(aq)][NH3]^2 / [Ag(NH3)2+(aq)] mehema anna one wage)

na bn oke K enne man dala thiyena widiyata thama.. answer eke thiyenneth ehema

 

[Slesh]

palaweni eke gotha mistake eka weka thiyenne..
oke prashne widiyata K walata enna ona ekakaya balapan. eka enne mol-2 dm6 kiyala..
eth prashne deela thiyenne mol2 dm-6 kiyala..

oke un K kiyala deela tyenne 1/K wala ekakaya.
e nathath saandranaya ahuwama mol-4dm16 wage ekak enne naene ban.. sandranaya ahuwoth moldm-3 walin daala nikan hitu..

sulu kalahama mata uthtare enne mol-3 dm9 kiayala mata me seen eka awl bn.meka A/L ganak neh... matath oka thama hithune, ehnam sandranaya ahuwoth mol dm-3 dala thama inna wenne.. habai eakaka dala sulu karanna giyoth thama seen eka

 

[simsam]

2004 gane podi waraddak thiyanwa wage.2005 hadala kiyannam

 

[mottaya]

sulu kalahama mata uthtare enne mol-3 dm9 kiayala mata me seen eka awl bn.meka A/L ganak neh... matath oka thama hithune, ehnam sandranaya ahuwoth mol dm-3 dala thama inna wenne.. habai eakaka dala sulu karanna giyoth thama seen eka

ow itin. eth prashne awl nam lakunu denawa.. 04 marking scheme eka hoyagena balapan.. lakunu deela tyenna ona..

 

[Slesh]

ow itin. eth prashne awl nam lakunu denawa.. 04 marking scheme eka hoyagena balapan.. lakunu deela tyenna ona..

man baluwa, eka thama awla.answer book dekakama thiyenne eakaka noda sulukarala anthimata kelinma uththare mol dm-3 kiyala thiyala. ekai mata me awla awe.ekata lakunu 5 kuth deela meka gane awlak wenna athi.habai othana kattiya ea awurudde hira wenna athi.ane manda ithin ehenam sandranaya hoyanawanam kelinma mol dm-3 kiyala danna thiyenne.

 

[Slesh]

2004 gane podi waraddak thiyanwa wage.2005 hadala kiyannam

OK

 

[mottaya]

man baluwa, eka thama awla.answer book dekakama thiyenne eakaka noda sulukarala anthimata kelinma uththare mol dm-3 kiyala thiyala. ekai mata me awla awe.ekata lakunu 5 kuth deela meka gane awlak wenna athi.habai othana kattiya ea awurudde hira wenna athi.ane manda ithin ehenam sandranaya hoyanawanam kelinma mol dm-3 kiyala danna thiyenne.

ow ehma karapan.

 

[Slesh]

ow ehma karapan.

okata " rolling on the floor laughing " wenna onaye.. anyway Thanks

 

[^Night Fury^]

අවුරුද්දකට විටහ්‍ර කලින් ඇහුවා න්අම් උඹට ඔය ගාණ ලෙසටම කියලා දෙන්න තිබ්බා. මෙලෝ දෙයක් දැන් මතක නෑ බං. ඒ නිසා බම්ප් එකක් දමමි ​

 

[Slesh]

අවුරුද්දකට විටහ්‍ර කලින් ඇහුවා න්අම් උඹට ඔය ගාණ ලෙසටම කියලා දෙන්න තිබ්බා. මෙලෝ දෙයක් දැන් මතක නෑ බං. ඒ නිසා බම්ප් එකක් දමමි ​

ela machan

 

[hancok]

ithhin sandranaya moldm-3 walin nennam denne

 

[mottaya]

ithhin sandranaya moldm-3 walin nennam denne