Answer:j
Explanation:im not stupid??
Answer:
I'm pretty sure it's neutrons the first one
Answer:
13
Explanation:
because the number of protons and electrons in the atom are the same
What you have to keep in mind is that
pH = - log[H+]
so 3.75 = -log[H+], we get [H+]=

,
that is [H+]≈1.77827941×

(i see this result on calculator)
this is just what you want!