Answer:
z≅3
Atomic number is 3, So ion is Lithium ion ()
Explanation:
First of all
v=f*λ
In our case v=c
c=f*λ
λ=c/f
where:
c is the speed of light
f is the frequency
Using Rydberg's Formula:
Where:
R is Rydberg constant=
z is atomic Number
For highest Energy:
n_1=1
n_2=∞
z≅3
Atomic number is 3, So ion is Lithium ion ()
Answer:- pH is 2.14.
Solution:- Nitrous acid, is a weak acid so first of all we solve for
and then figure out the pH.
the equation is written as:
Initial concentration for the acid is given as 0.120 M. Let's say the change in concentration is x. Then the equilibrium concentrations would be as:
=
=
Ka for nitrous acid is and the equilibrium expression for this would be written as:
Let's plug in the values in it.
To make the calculations easy we could ignore for the bottom and the expression becomes:
On cross multiply:
On taking square root to both sides:
So,
Now we could calculate the pH using the pH formula:
pH = 2.14
So, the pH of 0.120M nitrous acid is 2.14.