Consider the following balanced equilibrium expression 2 CrO_4^2- + 2 H^+ right

Question

Consider the following balanced equilibrium expression 2 CrO_4^2- + 2 H^+ right lift arrow Cr_2O_2^2- + H_2O Which of the following statements is true. Dissolving Na_2crO_4 in pure water will result in an acidic solution Addition of cr_2O_7^2- ion will shift the equilibrium position to the right Addition of acid to the equilibrium mixture will form more CrO_4O_4^2- ions Dissolving Na_2Cr_2O_7 in pure water will result in an a solution Addition of pure water will shift the equilibrium to the left Rank the following aqueous solutions from most acidic to least acidic, 0.1 M H_3PO_4 (K_a1 = 7.1times 10^-3) 0.1 M NaOH 1 M HCl 0.2 M C6H_5NH_3CI (C_6H_5NH_2 K_b 1.12 times 10^-3) 0.1 M Ba (OH)_2 0.1 M HClO_4 5 > 2 > 1 > 4 > 6 > 3 1 > 2 > 3 > 4 > 5 > 6 3 > 6 > 1 > 4 > 2 > 5 3 > 6 > 4 > 1 > 2 > 5 1 > 3 > 5 > 2 > 4 > 6

Explanation / Answer

3) True statements are,

- This is because when  Na2Cr2O7 is added the concentration of Cr2O72- increases and according to Lechatelier's principle the equilibrium shifts to left side and hence more H+ will form making the solution acidic.

- In accordance with Lechatelier's principle

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