With GCE O Levels Chemistry (Pure) and Combine Science Examinations in about 37 days time, i hope you are siphoning out some quality time to revise on your Chemistry Concepts.
In view that you might be looking for more questions to attempt, you can try out this question that was sent to me by my student from Cedar Girls.
Question:
Phosphorus and nitrogen are both in Group V of the Periodic Table.
Which ions are produced when phosphine, PH3, dissolves in water?A) PH3+, H+
B) PH4+, H+
C) PH3+, OH–
D) PH4+, OH–
Go try it out and leave your suggested answer and thought-process below.
PS: Feel free to send it to your friend that might benefit from this post.
PPS: Remember that mastery of Chemistry requires you to understand the key concepts and the ability to use it for application questions. Rote memorisation alone will not help you to achieve the grades you desire. You have 37 days more! Do something!
When we say “All chlorides are soluble except for HgCl, AgCl and PbCl2”, does it mean that HgCl, AgCl and PbCl2 are insoluble only in water or in any solvent?
Hi Xania,
Check out the discussions above.
Keep learning. Ask questions in class whenever in doubt. Ask the teacher, ask your friends….
To Your Academic Success in Chemistry,
Sean Chua
Absolutely. Good that you realised that Phosphorus (P) and Nitrogen (N) are in the same group. They will exhibit same group properties and thus we would expect NH3 + H20 –> NH4+ + OH-.
The solution will be alkaline due to hydroxide (OH-) ions dissociated.
All the Best to your Chemistry!
Sean Chua
Brilliant answer. All the best to your chemistry!
Sean Chua
HAHa..I don’t know how to do but yet im from cedar girls too..
D?
Since phosphorus is in group V of the periodic table , it should somewhat have similar chemical properties as Nitrogen. Therefore by “substituting” P with N , we get NH3 which is ammonia, something we’re familiar with and when ammonia dissolves in water , we get the equation
NH3 + H2O NH4+ + OH-
Therefore if we compare the ions , ans should be D. I guess…
Interesting Question 🙂
My choice of answer is D.
Please correct me if i’m wrong 🙂
When phosphine is dissolved in water (H2O)
The ions being produced will be PH4+, OH-
as an alkali/base (phosphine) react with water to produce hydroxide ions, there answer 1 & 2 is out.
Using the equation,
PH3 + H20 —> PH4 + OH-
Therefore, answer is D.