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![[Post New]](/templates/default/images/icon_minipost_new.gif) 6 Feb 2008 17:18:42 IST
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hello al, i have my phy and chem prac 2morrow. i am confident in phy but not that confident in chem( with those salt analysis and volumetric stuffs) will appreciate if u guys give me a few tips to remember ( in both). five pointers for all tips.........
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Remember Cedric. Remember, if the time should come when you have to make a choice between what is right and what is easy, remember what happened to a boy who was good, and kind, and brave, because he strayed across the path of Lord Voldemort. Remember Cedric Diggory.
Albus Dumbledore
Goblet of Fire, Chapter 37, Page 724
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6 Feb 2008 17:34:03 IST
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Actually i'm havin a small tabular column abt how excatly to remember the salts..i don know whether this will b useful or not..but if u giv me ur id..i shall send the scanned image to u..
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6 Feb 2008 17:34:44 IST
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hey, thanx........wait i'll nudge u.
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Remember Cedric. Remember, if the time should come when you have to make a choice between what is right and what is easy, remember what happened to a boy who was good, and kind, and brave, because he strayed across the path of Lord Voldemort. Remember Cedric Diggory.
Albus Dumbledore
Goblet of Fire, Chapter 37, Page 724
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6 Feb 2008 19:38:58 IST
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To find the salt mixture as soon as u get it
color salts
Copper sulphate + Ammonium Chloride ------> Blue Colour
Copper Chloride + Calcium Carbonate -------> Green colour
Ferric Chloride + Magnesium Sulphate -------> Brown Color
white salts
Add dil.HCl to the salt and NOT salt solution
Lead Nitrate + Ammonium Carbonate --------> Brisk effervesence
Barium Chloride + Zinc sulphide ---------> Rotten egg smell
Aluminium Sulphate + Ammonium chloride -------> Nothing happens....
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6 Feb 2008 19:39:19 IST
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ALL THE BEST!!!!!!!
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6 Feb 2008 19:46:55 IST
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Confirmatory test for ACID RADICAL
Sulphate
S.S + Barium Chloride -------> White precipitate..
S.S + Lead acetate -------> white precipitate...
Nitrate
S.S + ferrous sulphate solution + con.H2SO4 ------> Brown Ring
Salt + copper turnings + con.H2SO4 ------> Reddish Brown gas..
Chloride
Chromyl Chloride Test
S.S + silver nitrate ------> curdy white precipitate
Carbonate
S.S + dil.HCl -------> Brisk effervescence...
Sulphide
S.S + silver nitrate ---------> Black precipitate....
S.S + dil.HCl --------> Rotten egg smell....
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6 Feb 2008 19:47:22 IST
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I had my phy practicals 2day.....and I got exp 2 compare the emfs of 2 cells.....in the viva only basic ques concerning electricity and sum gud conceptual ques were asked from optics .........as far as exps r concerned u shud remember well the circuit diagrams........
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6 Feb 2008 19:50:07 IST
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I too had my che practicals today and i got 'Estimation of Oxalic Acid'
dont worry and if u dont know anything go straightly to internal Examiner He/She will surely help u!!!!!
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6 Feb 2008 19:55:14 IST
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as in volu analysis in chem, only and only basic things hav 2 b kept in mind like m1v1/n1 = m2v2/n2 & the basic definition of molarity,strength etc........ as far as salt analysis is concerned, remember that sequence is of grrr8 importance in it.........vaise I hav mentioned earlier also that majority of the studs do not detect the radicals correctly.....so that isn't a prob...... but neway BEST OF lUCK!!!!!
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6 Feb 2008 20:44:16 IST
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hey if u have an excellent rappo with the labassistant go straight to him. in chem choose a salt which looks fluffy (like a talcum powder ), it will surely come out to be carbonate. then do flame test(in schools generally with carbonates it is grp5 carbonates) or magnesium carbonate. talk beforehand wid d the lab assis to tell u the reading for viva study d projet an salt analysis well following were d questions that i was asked 1)colour of tollens reagent(colourless) 2)chelating complex of fehlings soln(tartaric acid chelating wid copper) 3)wt r d acid radical in which gives efervescence eith acis( carbonate and sulphite) dont get nervous and everything will turn out fine cheers!!!!!!!!
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6 Feb 2008 21:40:56 IST
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thank u guys......hats off to all of u.
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Remember Cedric. Remember, if the time should come when you have to make a choice between what is right and what is easy, remember what happened to a boy who was good, and kind, and brave, because he strayed across the path of Lord Voldemort. Remember Cedric Diggory.
Albus Dumbledore
Goblet of Fire, Chapter 37, Page 724
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6 Feb 2008 21:44:37 IST
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well i doubt the lab assistant will tell us anything.......nt even if the world cums to an end...
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Remember Cedric. Remember, if the time should come when you have to make a choice between what is right and what is easy, remember what happened to a boy who was good, and kind, and brave, because he strayed across the path of Lord Voldemort. Remember Cedric Diggory.
Albus Dumbledore
Goblet of Fire, Chapter 37, Page 724
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6 Feb 2008 21:48:08 IST
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lab asst usually does help out...
its a board prac
they want you to get full marks.... :)
our lab asst secretly came and told us the salts ::)
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6 Feb 2008 21:49:40 IST
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hope the external is gud.......
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Remember Cedric. Remember, if the time should come when you have to make a choice between what is right and what is easy, remember what happened to a boy who was good, and kind, and brave, because he strayed across the path of Lord Voldemort. Remember Cedric Diggory.
Albus Dumbledore
Goblet of Fire, Chapter 37, Page 724
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