Answer:
A 0.001 molar solution of weak acid has a pH = 4.0,The pKa is :
B. 5
Explanation:
pH = It is negative logarithm of hydrogen ion concentration.
pH = -log([H+])
Ka = It is the dissociation constant.
pKa = -log(Ka)
<u>The acid dissociates according to the equation given below:</u>
Here , The concentration of A- and H+ will be same
So,
[H+] = [A-].....(1)
Now ,
pH = 4.0
pH = -log([H+])
4.0 = -log([H+])
- 4.0 = log([H+]) take antilog both side::"use scientific calculator"
From equation (1), [A-] =
[HA] = 0.001 M (given)
Insert the value of HA , H+ and A- in Ka
pKa = -log(Ka)
pKa = 5
Answer:
Anion,
Explanation:
Lewis structures are the diagrams which represent valence electrons of the atoms.
<u>The Lewis symbols help to visualize valence electrons of the atoms and also the number of ions gained or lost by the atom to complete their octet and get stable.</u>
The electronic configuration of selenium is : 2,8,18,6
The Lewis representation of the atom is:
<u>The valence electrons are 6 and it will gain 2 electrons to form corresponding anion. </u>
Thus most common form of selenium ion is
Answer:
c
Explanation:
b is not talking about vaccines and d is against vaccines
Hope this helps!