BANG! Why Phosphoric Acid Is Added In Redox Titration

In the redox titration of iron III with permanganate or dichromate we use phosphoric V acid to mask the color of iron III because it interferes with the end. For redox titrations of F e X 2 versus K M n O X 4 or versus K X 2 C r X 2 O X 7 role of phosphoric acid is quite unclear to me.

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