[Sunny_Kumar]

Calculate the pH of solution formed on mixing 0.2M NH₄Cl and 0.1M NH₃. The pK_b of ammonia solution is 4.75.

I want to know that if we consider concentration of NH₄⁺ obtained from NH₃ to be x, then will total concentration of H⁺ be 0.2 + x?
Does that mean we are considering complete dissociation of NH₄CL into its ions??? Will NH₄⁺ ions formed be also included in pH as H⁺ ions?


Second Question:

If this is so, then will hydrazinium ions formed during dissociation of 0.004M hydrazine be included in its pH?

[Sunny_Kumar]

I need help...Please!!!!!!!!!!

[Borek]

This is a buffer solution and you should use Henderson-Hasselbalch equation.

[Sunny_Kumar]

W e haven't studied any such equation so far and i don't believe its in our course right now..

Can you explain it using a simple method like taking the dissociated amount as x or something...pls...

[Borek]

Basically Henderson-Hasslebalch equation is just a dissociation constant definition transformed into another form. Trying to solve the question differently is a waste of time.