For titrating Fe^2+ against KMnO4, the medium used is acidified with

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For titrating $Fe X^{2 +}$ against $KMnO X_{4}$ , the medium used is acidified with

Dilute sulfuric acid supplies

H X^{+}

and is not oxidised or reduced by the reagents. HCl would be oxidised by permanganate and

HNO X_{3}

is itself an oxidant, both causing errors.