The term "corrosive" refers to solutions having $pH$ values below 2.8 or above 12.5.
Which of the following solutions are corrosive?
a) $[H_3O^+]=0,35$
b) $pOH=11$
c) $50\;mL$ containing $5\cdot10^{17}$ hydronium ions .
a)
$pH=0.46$ corrosive
b)
$pH=3$ not corrosive
c)
$n_{H_3O^+}$ $=$ $\frac{5\cdot10^{17}}{6\cdot10^{23}}$
$[H_3O^+]$ $=$ $\frac{5\cdot10^{17}}{6\cdot10^{23}\cdot 50\cdot10^{-3}}$
$pH$ $=$ $-log(\frac{5\cdot10^{17}}{6\cdot10^{23}\cdot 50\cdot10^{-3}})$ $=$ $4.8$ not corrosive
