Sodium periodate can refer to two different chemical compounds which are essentially sodium salts of the two varieties of periodate ion. Sodium metaperiodate (often abbreviated as m-periodate) has the formula NaIO4. Sodium orthoperiodate (often abbreviated as o-periodate) has the formula Na5IO6. Both salts are useful in certain synthetic chemistries for the oxidative power of the periodate ion.

Density is 3,865 kg m-3. It is soluble in water. When heated, it decomposes to form sodium iodate, NaIO3 and oxygen. This decomposition reaction is catalyzed by the presence of manganese(IV) oxide.

Sodium periodate can refer to two different chemical compounds which are essentially sodium salts of the two varieties of periodate ion. Sodium metaperiodate (often abbreviated as m-periodate) has the formula NaIO₄. Sodium orthoperiodate (often abbreviated as o-periodate) has the formula Na₅IO₆. Both salts are useful in certain synthetic chemistries for the oxidative power of the periodate ion.

Density is 3,865 kg m-3. It is soluble in water. When heated, it decomposes to form sodium iodate, NaIO₃ and oxygen. This decomposition reaction is catalyzed by the presence of manganese(IV) oxide.

Note that the pronunciation is per-iodate, not period-ate.

Potassium periodate has formula KIO₄.

Density is 3,618 kg m-3. It melts at 581.85 °C and has a molecular weight of 230.0 g/mol.

It is slightly soluble in water (one of the less soluble of potassium salts, owing to a large anion), giving rise to a solution that is slightly alkaline. On heating (especially with manganese(IV) oxide as catalyst), it decomposes to form potassium iodate, releasing oxygen gas.

The low solubility of KIO4 makes it useful for the determination of potassium.

Note that the pronunciation is per-iodate, not period-ate.