The correct response is the second option.
6.1103x10^4. As this was the only answer that had the same number of significant figures as the starting value.
The concentration of hydrogen can be shown as:
[H+ ] = 3 * 10-5 M
pH can be determined as:
pH = - log [H+ ]
= - log (3 * 10-5)
= 4.53
Thus the pH of solution is 4.53
It should remain constant because of the law of conservation of mass and because the flask is sealed no mass will escape
