Is a spouse entitled to any home equity of a home purchased by the other spouse before the two were married.

You are correct, however, any increase in value during the marriage is marital property to which you have a right. Example: spouse buys house outright for $100,000. At the time of separation from the other spouse, house is worth $200,000. The marital property is $100,000 plus any other property obtained during the marriage. Example 2: spouse buys a $100,000 house by putting a down payment on it of $50,000. House is paid off and still only worth $100,000 at the time of separation. Marital property = $50,000.