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Identify KNO3 and KH2PO4 at home

How do I make a simple home distillation device?What is the chemical reaction in a home-made high-bouncer ball?Any home made tricks to fill up a baloon that floats?What kind of fire extinguisher for chemistry at home?Heating CuO and UreaIs home synthesis of cellulose acetate possible, and why?Home science optical absorption test for approximate caffeine quantity in coffee?Unknown crystals formed on cooling a zinc acetate solutionMulti-solvent recrystallization to extract solute from glycerol?Colorimetry at home?

2

$begingroup$

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

share|improve this question

edited 31 mins ago

andselisk

17k655115

asked 6 hours ago

IchsanIchsan

141

New contributor

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$endgroup$

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  KNO3 is much better soluble in water.
  $endgroup$
  – Mithoron
  4 hours ago
  

  
  
  
  

add a comment | 

2

$begingroup$

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

share|improve this question

edited 31 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

share|improve this question

edited 31 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.

$endgroup$

share|improve this question

edited 31 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.

share|improve this question

edited 31 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 31 mins ago

andselisk

17k655115

edited 31 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.

asked 6 hours ago

IchsanIchsan

141

3 Answers
3

active

oldest

votes

4

$begingroup$

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.

share|improve this answer

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 | 

2

$begingroup$

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.

share|improve this answer

edited 26 mins ago

answered 33 mins ago

andseliskandselisk

17k655115

$endgroup$

add a comment | 

1

$begingroup$

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

share|improve this answer

answered 16 mins ago

permeakrapermeakra

18.1k13681

$endgroup$

add a comment | 

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4

$begingroup$

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.

share|improve this answer

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 | 

4

$begingroup$

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.

share|improve this answer

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.

share|improve this answer

answered 5 hours ago

ringoringo

19.9k557107

$endgroup$

share|improve this answer

answered 5 hours ago

ringoringo

19.9k557107

answered 5 hours ago

ringoringo

19.9k557107

answered 5 hours ago

ringoringo

19.9k557107

2

$begingroup$

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.

share|improve this answer

edited 26 mins ago

answered 33 mins ago

andseliskandselisk

17k655115

$endgroup$

add a comment | 

2

$begingroup$

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.

share|improve this answer

edited 26 mins ago

answered 33 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.

share|improve this answer

edited 26 mins ago

answered 33 mins ago

andseliskandselisk

17k655115

$endgroup$

share|improve this answer

edited 26 mins ago

answered 33 mins ago

andseliskandselisk

17k655115

answered 33 mins ago

andseliskandselisk

17k655115

answered 33 mins ago

andseliskandselisk

17k655115

1

$begingroup$

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

share|improve this answer

answered 16 mins ago

permeakrapermeakra

18.1k13681

$endgroup$

add a comment | 

1

$begingroup$

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

share|improve this answer

answered 16 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

share|improve this answer

answered 16 mins ago

permeakrapermeakra

18.1k13681

$endgroup$

share|improve this answer

answered 16 mins ago

permeakrapermeakra

18.1k13681

answered 16 mins ago

permeakrapermeakra

18.1k13681

answered 16 mins ago

permeakrapermeakra

18.1k13681