Can anyone answer this A levels chemistry question? The answer A, I just need the explanation.

If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution

If you add 5.00 ml of 0.100 m sodium hydroxide to 50.0 ml of acetate buffer that is 0.100 m in both acetic acid and sodium acetate, what is the ph of the resulting solution? acetic acid: ka = 1.8. x 10-5

Classify this reaction: 2al+n2-> aln.