Acid:
- Sour flavor
- Turns litmus paper red
- Dissolves some metals
Base:
- Bitter flavor
- Turns litmus paper blue
- Feels slippery
\[
\boxed{
\begin{array}{c}
\text{Acid:} \\
\text{Sour flavor} \\
\text{Turns litmus paper red} \\
\text{Dissolves some metals} \\
\end{array}
}
\]
\[
\boxed{
\begin{array}{c}
\text{Base:} \\
\text{Bitter flavor} \\
\text{Turns litmus paper blue} \\
\text{Feels slippery} \\
\end{array}
}
\]