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The reaction between potassium dichromate and concentrated hydrochloric acid, produces a mixed aqueous solution of chromium(III)...

The reaction between potassium dichromate and concentrated hydrochloric acid, produces a mixed aqueous solution of chromium(III) chloride and potassium chloride, and evolving gaseous chlorine.

K2Cr2O7(s) + 14 HCl(aq) ⟶ 2 K+(aq) + 2 Cr3+(aq) + 8 Cl- (aq) + 7 H2O(l) + 3 Cl2(g)

Suppose that 9.73 g of K2Cr2O7(s) react with concentrated HCl, and that the final volume of the solution is 124.3 mL.

Calculate the final concentration of Cr3+(aq) produced:
(Aside: also, think about and the number of moles of chlorine produced).

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