Question

Find the equivalent weight of potassium hydroxide.
$(K=39,O=16,H=1)$

• A. $66u$
• B. $78u$
• C. $56u$
• D. $43$

Answer 1

The correct option is C $56u$

The molecular formula of potassium hydroxide is $KOH$.
Its molecular mass is $=(39+16+1)=56u$
The expression for the equivalent weight of $KOH$ is as given below.
Equivalent weight $=\frac{\text{Molecular mass}}{\text{No. of replaceable OH groups}}$
potassium hydroxide contains one rplaceable OH group.
Substitute values in the above expression.
Equivalent weight $=\frac{56}{1}=56u$