Answer:
0.007 M
Explanation:
pH is defined as the negative logarithm of the concentration of hydrogen ions.
Thus,
pH = - log [H⁺]
The expression of the pH of the calculation of weak acid is:-
Where, C is the concentration = ?
Given, pH = 3.45
So, for 
, 
C = 0.007 M
C) volume
.........
The volume of gas depends on e.g. temperature and pressure.
Answer:
B
Explanation:
the energy of two separate hydrogen atoms decreases as they approach each other, and the single electrons on each atom are shared to form a covalent bond.
15mL because if it started as 20 mL and went to 35mL when u put in pyrite, the pyrite takes up 15mL
6.02 times 10 to the 23 power, which is Avogadros number
