The nail in a jar lab

The lab we did over the past 3 days has been to find the product of a reaction of iron and copper chloride. To start this we had to mass a baby food jar, acquire around 4g of copper chloride (put it into the baby food jar with water to mix it), and put a iron nail in the jar. after letting this sit for one day we took out the nail and washed out the jar while leaving the produced copper inside of the jar. After letting this sit for the weekend we to the dried pure copper and got the mass of it and the nail. Using the mass of the nail we found out if the reaction made iron(II) chloride or iron(III) chloride. Most of the reactions made iron(III) chloride.