Question

So the valency of OH in CH³COOH is 2 because C has two bonds with O and 1 bond with OH

Answer 1

The ‘valency’ of the OH ion is -1. This is because the ion has an overall charge of -1.

The hydroxide ion (OH) is made up of one negatively charged oxygen anion, which has a charge of 2-, and one positively charged hydrogen cation, which has a charge of 1+.

Since there is one of each ion, the overall charge ( is simply the sum of the individual charges.

(-2) + (+1) = -1

Thus the OH ion has a -1 charge