#4 and #5:
To find pH given concentration of H+ or H30+
pH = - log (H+ or H30+ M)
To find pH given concentration of OH-
Since you already found the pH for this (in #4), you subtract #4's answer from 14.
14 - (pH) = pOH
2 <span>KOH +1 H3AsO4 →1 K2HAsO4 + 2 H2O</span>
<h2><em>Solid. Because molecules densely packed it has a high resistance to flow thereby lower kinetic energy.
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Talk to them back don't be scared
Because of the crystal structure of the ice, ice has lower density than liquid water. So the volume of the ice of same mass is greater than water. When melting, the volume will decrease.
