Which of the following calculations would require the use of the quadratic formu

Question

Which of the following calculations would require the use of the quadratic formula? A. Calculating the pH of 0.010 M HCI B. Calculating the pH of 0.010 M HF (K.-7.1 x 104) C. Calculating the pH of 0.010 M CH COOH (K 1.8 x 103) D. Calculating the pH of 0.010 M HCN (K, 4.9 x 10"") E. None of the above 7. 8. An aqueous solution of H SO4 would contain which of the following? A. H SO4, HSO4 SO42, and H:0 C. SO2 and HO D. H2SO4. SO, and H3O* True or False (1.5 point each) 9 A solution of HNOs would change the color of litmus from red to blue. A. True B. False Addition of an acid to a solution will cause an increase in pH. A. True B. False 10. Short Answer 11. List the following solutions given below from the one with the lowest pH to the one with the highest pH. (2 points) 0.10 M ChIsCOOH 0.10MHCOOH 0.10 M HNOs 0.10 M NHs Lowest pH Highest pH If an aqueous solution has a hydronium ion concentration of 4.5 x 10* M, what is the hydroxide ion concentration in the solution? (2 points) 12.

Explanation / Answer

Ans 7 : D) Calculating the pH of 0.010 M HCN (Ka = 4.9 x 10-10)

The strong acids dissociate completely into aqueous solutions , whereas the weak acids do not.

The weakest acid here is HCN ,with the lowest Ka value . So the calculation of pH of this acid will require the use of quadratic formula.

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