When designing an experiment, scientists should, whenever possible, always have a large and
representative sample size and these to ensure that something other than what is being studied
is not causing or influencing their results.
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Ответ:
Fe2+
Explanation:
By definition, an intermediate is something not present initially and does not appear in the final products. In the two steps provided, the only substance that is not present initially nor is a product is Fe2+.