What is the primary purpose of the supremacy clause

It divides power between state and national governments.

to describe the relationship between federal and state powers

Explanation:

Basically, the supremacy clause states that the Federal Law is above state law and cannot be trumped at all. Which means that state courts are bound by supreme (in this case, Federal) law and the Constitution of the United States of America. The text is the following:

"This Constitution, and the Laws of the United States which shall be made in Pursuance thereof; and all Treaties made, or which shall be made, under the Authority of the United States, shall be the supreme Law of the Land; and the Judges in every State shall be bound thereby, any Thing in the Constitution or Laws of any State to the Contrary notwithstanding."

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