Negotiating With God

Genesis 18:16-33 As Abraham’s three visitors prepare to leave, God reveals to Abraham what he is intending to do with Sodom and Gomorrah. Why does God choose to reveal His plans to Abraham? What is the source of the outcry and why does God say that He will know if things are not as bad as the outcry? What really was Abraham’s concern that prompted him to enter into this involved negotiation with God. What was Abraham’s personal investment in God’s answer to his prayer?