Preparation of a pH scale
<p>Beside the substances used:
• Acid --&gt; HCl (Hydrochloric Acid)
• Neutral --&gt; H2O (Water)
</p>
• Base --&gt; NaOH (Sodium Hydroxide)
<a href="//commons.wikimedia.org/w/index.php?title=User:Alvy16&amp;action=edit&amp;redlink=1" class="new" title="User:Alvy16 (page does not exist)">Alvy16</a>
CC BY 4.0
<span class="int-own-work" lang="en">Own work</span>