thegodofgod
Badges: 19
Rep:
?
#1
Report Thread starter 10 years ago
#1
Hey,

in the AQA June 2010 Chemistry Unit 1 paper, a question came up, saying why SO2 would react with CaO, and the answer was because SO2 is an acidic gas.

My question is, how can you tell if a gas is acidic or alkaline (without carrying out any pH tests)?

Thanks a lot
0
reply
thegodofgod
Badges: 19
Rep:
?
#2
Report Thread starter 10 years ago
#2
bump
0
reply
gozatron
Badges: 16
Rep:
?
#3
Report 10 years ago
#3
(Original post by thegodofgod)
bump
Have you come across Lewis bases and Acids in chemistry yet?
0
reply
thegodofgod
Badges: 19
Rep:
?
#4
Report Thread starter 10 years ago
#4
(Original post by gozatron)
Have you come across Lewis bases and Acids in chemistry yet?
no , only AS, i think that comes in A2 if i'm not mistaken
0
reply
charco
Badges: 17
Rep:
?
#5
Report 10 years ago
#5
(Original post by thegodofgod)
Hey,

in the AQA June 2010 Chemistry Unit 1 paper, a question came up, saying why SO2 would react with CaO, and the answer was because SO2 is an acidic gas.

My question is, how can you tell if a gas is acidic or alkaline (without carrying out any pH tests)?

Thanks a lot
In general:

Non-metal oxides = acidic or neutral
Metal oxides = basic or amphoteric

You are supposed to know that non-metal oxides are acidic, with the exception of non-metal oxides of elements in the lowest oxidation state, such as carbon monoxide and nitrous oxide, both of which are neutral...

You should also be able to link SO2 and NOx gases with acid rain...

In terms of alkaline gases, there is only one and that is ammonia.

Other (non-oxide) gases you should just learn, there's not many of them:

Chlorine is acidic, but rapidly bleaches indicator paper:

Cl2 + H2O --> HCl + HOCl

Hydrogen chloride is very acidic
Oxygen is neutral
Hydrogen is neutral
Nitrogen is neutral
2
reply
thegodofgod
Badges: 19
Rep:
?
#6
Report Thread starter 10 years ago
#6
(Original post by charco)
In general:

Non-metal oxides = acidic or neutral
Metal oxides = basic or amphoteric

You are supposed to know that non-metal oxides are acidic, with the exception of non-metal oxides of elements in the lowest oxidation state, such as carbon monoxide and nitrous oxide, both of which are neutral...

You should also be able to link SO2 and NOx gases with acid rain...

In terms of alkaline gases, there is only one and that is ammonia.

Other (non-oxide) gases you should just learn, there's not many of them:

Chlorine is acidic, but rapidly bleaches indicator paper:

Cl2 + H2O --> HCl + HOCl

Hydrogen chloride is very acidic
Oxygen is neutral
Hydrogen is neutral
Nitrogen is neutral
cheers mate!
0
reply
piggyblue
Badges: 0
Rep:
?
#7
Report 3 years ago
#7
Thank you so so much!!!!!!!!!!!! This was so helpful!!!
0
reply
Rocky7886
Badges: 2
Rep:
?
#8
Report 1 year ago
#8
all non-metal oxides are acidic while all metal oxides are basic. ammonium oxide is basic too
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

What factors affect your mental health the most right now?

Anxiousness about lockdown easing (147)
4.89%
Uncertainty around my education (443)
14.73%
Uncertainty around my future career prospects (338)
11.24%
Lack of purpose or motivation (419)
13.93%
Lack of support system (eg. teachers, counsellors, delays in care) (140)
4.66%
Impact of lockdown on physical health (181)
6.02%
Loneliness (258)
8.58%
Financial worries (109)
3.62%
Concern about myself or my loves ones getting/having been ill (123)
4.09%
Exposure to negative news/social media (136)
4.52%
Lack of real life entertainment (163)
5.42%
Lack of confidence in making big life decisions (266)
8.85%
Worry about missed opportunities during the pandemic (284)
9.44%

Watched Threads

View All