Which correctly describes the relationship between a hydrate, water, and an anhydrous compound?
heating an anhydrous compound forms water and a hydrate.
adding water to an anhydrous compound forms a hydrate.
combining an anhydrous compound and a hydrate produces water.
removing a hydrate from an anhydrous compound produces water

Adding water to an anhydrous compound forms a hydrate.

Explanation:-

Hydrates are compounds formed by compounds which contain water as molecules in their structure. Example:

Anhydrous compounds are those which do not contain molecules of water in their structure. Example:

Thus on heating hydrates lose water to form anhydrous compounds.

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.