Question

Write the chemical formula of the compound potassium dichromate in a step-by-step manner.

Answer 1

The symbol of potassium is ‘K’ which is derived from the word Kalium, having a valency of 1⁺.

The formula of dichromate is ‘Cr₂O₇’ with valency 2^-.

Step 1 –

Write the formula of potassium permanganate:

Symbol Valency

Potassium K 1⁺

Dichromate Cr₂O₇ 2^-

Step 2 –

Write each symbol with its valency:

K¹⁺ Cr₂O₇^2-

Step 3 –

Interchanging the valencies:

$$\begin{gathered} \mathrm{K}{\mathrm{Cr}}_2\mathrm{O}{7_7}^{} \\ \searrow \swarrow \\ {1}^{+}{2}^{-} \end{gathered}$$

The formula of the compound potassium dichromate would be K₂Cr₂O₇.