questions about chemistry practicals

[abdullah200]

Salam
I have a few questions chemistry practicals (Some would sound really stupid as I did my practice long time ago)
1-how do we distinguish between Al ions and Pb ions?
2-when they say (Do not heat any tube with a naked flame )wham am I supposed to do?
3-when using the litmus paper do I have to make it wet?
4-(the most stupid question) the boiling tube is the one which is slightly larger than the other tubes right?
please answer the questions seriously with no jokes
thanks.

 

[Nishii]

No questions are stupid dude
1. Add HCl, no reaction with Al3+, white ppt with PB2+
2. i forgot the name of the equipment used sorry..
3.Yes, it should be damp.
4. You are right, its much bigger than testtubes

 

[abdullah200]

No questions are stupid dude
1. Add HCl, no reaction with Al3+, white ppt with PB2+
2. i forgot the name of the equipment used sorry..
3.Yes, it should be damp.
4. You are right, its much bigger than testtubes

Thanks a lot that was very helpful
if anyone could answer the 2nd question that would be really helpful

 

[Nishii]

hey i found it! its a tripod stand and on it, you should place wire gauze!

 

[Nishii]

you can find this useful : http://www.nuffieldfoundation.org/practical-chemistry/heating-substances
especially the "Heating flammable liquids" part!

 

[Nishii]

http://www.xtremepapers.com/community/threads/tips-for-chemistry-practicals-p3.11810/

 

[abdullah200]

I can't thank you enough Nishii your posts helped me a lot
I hate to bother you but I have a last question
When using acidified dichromate ions (for identifying alcohols for example) are the chromate ions already acidified or do I have do to add acid to it?

 

[Nishii]

I can't thank you enough Nishii your posts helped me a lot
I hate to bother you but I have a last question
When using acidified dichromate ions (for identifying alcohols for example) are the chromate ions already acidified or do I have do to add acid to it?

dichromate ions are orange and already acidified whereas chromate ions are yellow and not acidified

 

[abdullah200]

dichromate ions are orange and already acidified whereas chromate ions are yellow and not acidified

thank you very much

 

[abdullah200]

By the way are hard glass test tubes & boiling tubes the same thing?
if not how does hard glass test tubes looks like?( never used one )

 

[VicBoss]

S07 p31 colourless gas is released (effervescent observed ) by the addition of acid. So it can be CO2 or SO2 (its co2) ,how am i suppose to know which one it is without carrying out a test or using least time possible?

 

[sheikhoooo]

View attachment 16414

hey i found it! its a tripod stand and on it, you should place wire gauze!

if im not wrong this tripod is only used to heat sumthing when its in beaker, tripod isnt used to heat a test tube..? right?

 

[ZohaibAsad]

Yes

 

[ZohaibAsad]

S07 p31 colourless gas is released (effervescent observed ) by the addition of acid. So it can be CO2 or SO2 (its co2) ,how am i suppose to know which one it is without carrying out a test or using least time possible?

Carbon dioxide is odorless, Sulfur dioxide has an irritating and pungent odor

 

[Nishii]

if im not wrong this tripod is only used to heat sumthing when its in beaker, tripod isnt used to heat a test tube..? right?

yeah!