Identify KNO3 and KH2PO4 at home
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I am not expert in chemistry. I need to find a way to identify a $ce{KNO3}$ and $ce{KH2PO4}$ powder at home. I suspect the seller gave me the wrong powder. What is the easiest way to do it at home?
inorganic-chemistry home-experiment
edited 16 mins ago
andselisk
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asked 6 hours ago
IchsanIchsan
141
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add a comment |
$begingroup$
I am not expert in chemistry. I need to find a way to identify a $ce{KNO3}$ and $ce{KH2PO4}$ powder at home. I suspect the seller gave me the wrong powder. What is the easiest way to do it at home?
inorganic-chemistry home-experiment
edited 16 mins ago
andselisk
17k655115
asked 6 hours ago
IchsanIchsan
141
New contributor
Ichsan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
2
$begingroup$
KNO3 is much better soluble in water.
$endgroup$
– Mithoron
4 hours ago
add a comment |
$begingroup$
I am not expert in chemistry. I need to find a way to identify a $ce{KNO3}$ and $ce{KH2PO4}$ powder at home. I suspect the seller gave me the wrong powder. What is the easiest way to do it at home?
inorganic-chemistry home-experiment
edited 16 mins ago
andselisk
17k655115
asked 6 hours ago
IchsanIchsan
141
New contributor
Ichsan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
I am not expert in chemistry. I need to find a way to identify a $ce{KNO3}$ and $ce{KH2PO4}$ powder at home. I suspect the seller gave me the wrong powder. What is the easiest way to do it at home?
inorganic-chemistry home-experiment
inorganic-chemistry home-experiment
edited 16 mins ago
andselisk
17k655115
asked 6 hours ago
IchsanIchsan
141
New contributor
Ichsan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 16 mins ago
andselisk
17k655115
asked 6 hours ago
IchsanIchsan
141
New contributor
Ichsan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 16 mins ago
andselisk
17k655115
edited 16 mins ago
andselisk
17k655115
edited 16 mins ago
andselisk
17k655115
17k655115
asked 6 hours ago
IchsanIchsan
141
New contributor
Ichsan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 6 hours ago
IchsanIchsan
141
asked 6 hours ago
IchsanIchsan
141
141
New contributor
Ichsan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Ichsan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Ichsan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
2
$begingroup$
KNO3 is much better soluble in water.
$endgroup$
– Mithoron
4 hours ago
add a comment |
2
$begingroup$
KNO3 is much better soluble in water.
$endgroup$
– Mithoron
4 hours ago
2
2
$begingroup$
KNO3 is much better soluble in water.
$endgroup$
– Mithoron
4 hours ago
$begingroup$
KNO3 is much better soluble in water.
$endgroup$
– Mithoron
4 hours ago
add a comment |
3 Answers
3
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oldest
votes
$begingroup$
Well, given that one is a weak acid and the other is the salt of a strong base and a strong acid, the pH of a solution of the powder should tell you which it is. If it's $ce{KNO3}$ it should neutral, and if it's $ce{KH2PO4}$ it should be acidic. Just need some pH paper, which you could probably buy at a pool supply store.
answered 5 hours ago
ringoringo
19.9k557107
$endgroup$
1
$begingroup$
This could work, but KH2PO4 solution would have pH somewhere around 4.7 - water used at home might be as acidic as this, I guess.
$endgroup$
– Mithoron
4 hours ago
add a comment |
$begingroup$
In the absence of other chemicals you can utilize the fact that nitrates(V) are much stronger oxidizing agents than phosphates(V).
You can soak a piece of newspaper in a saturated solution of the salt, let it dry well in a ventilated place and try to ignite it.
If the salt was $ce{KNO3}$, it will burn vigorously and fast (that's why kids are often using paper soaked in sodium nitrate as primitive fuse for home-made firecrackers and rockets).
$ce{KH2PO4}$ doesn't promote combustion of paper, so it will burn normally or even slower.
answered 18 mins ago
andseliskandselisk
17k655115
$endgroup$
add a comment |
$begingroup$
Touch medium samples of both salts with a glowing ember. No noticable effect would be observed on contact with $ce{KH2PO4}$. Contact with $ce{KNO3}$ shall produce noticeable flame.
Video https://www.youtube.com/watch?v=dJRqJ145dyM
answered 2 mins ago
permeakrapermeakra
18.1k13681
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3 Answers
3
active
oldest
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3 Answers
3
active
oldest
votes
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active
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votes
$begingroup$
Well, given that one is a weak acid and the other is the salt of a strong base and a strong acid, the pH of a solution of the powder should tell you which it is. If it's $ce{KNO3}$ it should neutral, and if it's $ce{KH2PO4}$ it should be acidic. Just need some pH paper, which you could probably buy at a pool supply store.
answered 5 hours ago
ringoringo
19.9k557107
$endgroup$
1
$begingroup$
This could work, but KH2PO4 solution would have pH somewhere around 4.7 - water used at home might be as acidic as this, I guess.
$endgroup$
– Mithoron
4 hours ago
add a comment |
$begingroup$
Well, given that one is a weak acid and the other is the salt of a strong base and a strong acid, the pH of a solution of the powder should tell you which it is. If it's $ce{KNO3}$ it should neutral, and if it's $ce{KH2PO4}$ it should be acidic. Just need some pH paper, which you could probably buy at a pool supply store.
answered 5 hours ago
ringoringo
19.9k557107
$endgroup$
1
$begingroup$
This could work, but KH2PO4 solution would have pH somewhere around 4.7 - water used at home might be as acidic as this, I guess.
$endgroup$
– Mithoron
4 hours ago
add a comment |
$begingroup$
Well, given that one is a weak acid and the other is the salt of a strong base and a strong acid, the pH of a solution of the powder should tell you which it is. If it's $ce{KNO3}$ it should neutral, and if it's $ce{KH2PO4}$ it should be acidic. Just need some pH paper, which you could probably buy at a pool supply store.
answered 5 hours ago
ringoringo
19.9k557107
$endgroup$
Well, given that one is a weak acid and the other is the salt of a strong base and a strong acid, the pH of a solution of the powder should tell you which it is. If it's $ce{KNO3}$ it should neutral, and if it's $ce{KH2PO4}$ it should be acidic. Just need some pH paper, which you could probably buy at a pool supply store.
answered 5 hours ago
ringoringo
19.9k557107
answered 5 hours ago
ringoringo
19.9k557107
answered 5 hours ago
ringoringo
19.9k557107
answered 5 hours ago
ringoringo
19.9k557107
19.9k557107
1
$begingroup$
This could work, but KH2PO4 solution would have pH somewhere around 4.7 - water used at home might be as acidic as this, I guess.
$endgroup$
– Mithoron
4 hours ago
add a comment |
1
$begingroup$
This could work, but KH2PO4 solution would have pH somewhere around 4.7 - water used at home might be as acidic as this, I guess.
$endgroup$
– Mithoron
4 hours ago
1
1
$begingroup$
This could work, but KH2PO4 solution would have pH somewhere around 4.7 - water used at home might be as acidic as this, I guess.
$endgroup$
– Mithoron
4 hours ago
$begingroup$
This could work, but KH2PO4 solution would have pH somewhere around 4.7 - water used at home might be as acidic as this, I guess.
$endgroup$
– Mithoron
4 hours ago
add a comment |
$begingroup$
In the absence of other chemicals you can utilize the fact that nitrates(V) are much stronger oxidizing agents than phosphates(V).
You can soak a piece of newspaper in a saturated solution of the salt, let it dry well in a ventilated place and try to ignite it.
If the salt was $ce{KNO3}$, it will burn vigorously and fast (that's why kids are often using paper soaked in sodium nitrate as primitive fuse for home-made firecrackers and rockets).
$ce{KH2PO4}$ doesn't promote combustion of paper, so it will burn normally or even slower.
answered 18 mins ago
andseliskandselisk
17k655115
$endgroup$
add a comment |
$begingroup$
In the absence of other chemicals you can utilize the fact that nitrates(V) are much stronger oxidizing agents than phosphates(V).
You can soak a piece of newspaper in a saturated solution of the salt, let it dry well in a ventilated place and try to ignite it.
If the salt was $ce{KNO3}$, it will burn vigorously and fast (that's why kids are often using paper soaked in sodium nitrate as primitive fuse for home-made firecrackers and rockets).
$ce{KH2PO4}$ doesn't promote combustion of paper, so it will burn normally or even slower.
answered 18 mins ago
andseliskandselisk
17k655115
$endgroup$
add a comment |
$begingroup$
In the absence of other chemicals you can utilize the fact that nitrates(V) are much stronger oxidizing agents than phosphates(V).
You can soak a piece of newspaper in a saturated solution of the salt, let it dry well in a ventilated place and try to ignite it.
If the salt was $ce{KNO3}$, it will burn vigorously and fast (that's why kids are often using paper soaked in sodium nitrate as primitive fuse for home-made firecrackers and rockets).
$ce{KH2PO4}$ doesn't promote combustion of paper, so it will burn normally or even slower.
answered 18 mins ago
andseliskandselisk
17k655115
$endgroup$
In the absence of other chemicals you can utilize the fact that nitrates(V) are much stronger oxidizing agents than phosphates(V).
You can soak a piece of newspaper in a saturated solution of the salt, let it dry well in a ventilated place and try to ignite it.
If the salt was $ce{KNO3}$, it will burn vigorously and fast (that's why kids are often using paper soaked in sodium nitrate as primitive fuse for home-made firecrackers and rockets).
$ce{KH2PO4}$ doesn't promote combustion of paper, so it will burn normally or even slower.
answered 18 mins ago
andseliskandselisk
17k655115
edited 12 mins ago
answered 18 mins ago
andseliskandselisk
17k655115
answered 18 mins ago
andseliskandselisk
17k655115
answered 18 mins ago
andseliskandselisk
17k655115
17k655115
add a comment |
add a comment |
$begingroup$
Touch medium samples of both salts with a glowing ember. No noticable effect would be observed on contact with $ce{KH2PO4}$. Contact with $ce{KNO3}$ shall produce noticeable flame.
Video https://www.youtube.com/watch?v=dJRqJ145dyM
answered 2 mins ago
permeakrapermeakra
18.1k13681
$endgroup$
add a comment |
$begingroup$
Touch medium samples of both salts with a glowing ember. No noticable effect would be observed on contact with $ce{KH2PO4}$. Contact with $ce{KNO3}$ shall produce noticeable flame.
Video https://www.youtube.com/watch?v=dJRqJ145dyM
answered 2 mins ago
permeakrapermeakra
18.1k13681
$endgroup$
add a comment |
$begingroup$
Touch medium samples of both salts with a glowing ember. No noticable effect would be observed on contact with $ce{KH2PO4}$. Contact with $ce{KNO3}$ shall produce noticeable flame.
Video https://www.youtube.com/watch?v=dJRqJ145dyM
answered 2 mins ago
permeakrapermeakra
18.1k13681
$endgroup$
Touch medium samples of both salts with a glowing ember. No noticable effect would be observed on contact with $ce{KH2PO4}$. Contact with $ce{KNO3}$ shall produce noticeable flame.
Video https://www.youtube.com/watch?v=dJRqJ145dyM
answered 2 mins ago
permeakrapermeakra
18.1k13681
answered 2 mins ago
permeakrapermeakra
18.1k13681
answered 2 mins ago
permeakrapermeakra
18.1k13681
answered 2 mins ago
permeakrapermeakra
18.1k13681
18.1k13681
add a comment |
add a comment |
Ichsan is a new contributor. Be nice, and check out our Code of Conduct.
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2
$begingroup$
KNO3 is much better soluble in water.
$endgroup$
– Mithoron
4 hours ago