Acidity is measured on the
p
H
scale. The acidity of a substance is given by
p
H
=
−
log
H
, where
H
is the concentration of Hydrogen ions.

If a substance has a
p
H
of
7
, what is its
H
value?

If necessary, include a leading
0
with any decimals less than
1
. For example,
0.5
instead of
.5
.