The acid that is used to remove rust is..?

Chemistry

ScanSolve AI Answer

Answer

phosphoric acid

Step-by-step solution

2 steps

The acid used to remove rust (iron(III) oxide, Fe2O3\mathrm{Fe_2O_3}) is phosphoric acid.

  1. Reaction of rust with phosphoric acid

    Fe2O3+2H3PO4→2FePO4↓+3H2O\mathrm{Fe_2O_3 + 2H_3PO_4 \to 2FePO_4 \downarrow + 3H_2O}

  2. Iron(III) phosphate (FePO4\mathrm{FePO_4}) is insoluble and easily removed by scrubbing, leaving clean metal surface.

    Final answer
    phosphoric acid

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