Because it's water soluble it will pass through her system and be excreted in her urates, which will be bright yellow/orange , as Kathy said.
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There are so many kinds of poop, this chart illustrates just a few. Perhaps a fecal sample to the vet would give you a more definitive answer
http://www.the-chicken-chick.com/2012/02/whats-scoop-on-chicken-poop-digestive.html
Yes , so long as it is a poultry one. Your chicks should not be on starter at 10 months of age. It's not medicated starter is it ?