Chem help please!!?

I am running a direct titration with antacids and HCl, yet i am a bit confused as to what indicator i should use? We are supposed to analyze the effectiveness of antacids on stomach acid...so what would be an appropriate indicator to detect the proper neutralization point? please help!! a nice explanation would be appreciated as well.

Answer:
You should use phenolphthalein
Phenylalanine is good fall back.

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