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What is the effect of increasing pH on K...

What is the effect of increasing `pH` on `K_2Cr_2O_7` solution?

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In a titration experiment, 10 mL of an FeCI_2 solution consumed 25 mL of a standard K_2Cr_2O_7 solution to reach the equivalent point. The standard K_2Cr_2O_7 solution is prepared by dissolving 1.225 g of K_2Cr_2O_7 in 250 mL water. The concentration of the FeCI_2 solution is closest to [Given: molecular weight of K_2Cr_2O_7=294g mol^(-1)]