Question

How to calculate the equivalent weight of Potassium carbonate?

Answer 1

Step 1: Writing the equivalent weight formula

Equivalent weight is calculated by dividing the molecular weight by n factor.

Mathematically it is given as,

$\mathrm{Equivalent}\mathrm{weight}=\frac{\mathrm{Molecular}\mathrm{weight}}{\mathrm{n}}$

Step 2: Calculating equivalent weight of Potassium carbonate

Potassium carbonate have molecular formula ${\mathrm{K}}_2{\mathrm{CO}}_3$

n- factor is the total positive or negative charge on salts.

For ${\mathrm{K}}_2{\mathrm{CO}}_3,\mathrm{n}=2$

Since 2 moles of Potassium ion are formed; n factor will be 2.

$\underset{\mathrm{Potassium}\mathrm{carbonate}}{{\mathrm{K}}_2{\mathrm{CO}}_3}\to \underset{\mathrm{Potassium}\mathrm{ions}}{2{\mathrm{K}}^{+}}+\underset{\mathrm{Carbonate}\mathrm{ions}}{{{\mathrm{CO}}_3}^{2-}}$

Molecular weight of Potassium carbonate = 138g

$\therefore$Equivalent weight

=$$\begin{gathered} \frac{138}{2} \\ =69g \end{gathered}$$

Therefore, equivalent weight of potassium carbonate is $69\mathrm{g}$.