Answer
a. $pH = 3.04$: Acidic.
b. $[H^+] > 1.0 \times 10^{-7}M: $ Acidic
c. $pOH = 4.51$: Not acidic.
d. $[OH^-] = 3.21 \times 10^{-12}M$: Acidic.
Work Step by Step
a. The pH range for acidic is < 7. Since 3.04 < 7, this solution is acidic.
b. This is exactly the range for acidic solutions at $25^{\circ}C$.
c. The pOH range for acidic is > 7. Since 4.51 < 7, this is not an acidic solution.
d. The $[OH^-]$ range for acidic solutions is < $1.0 \times 10^{-7}$; therefore, this is an acidic solution.
