17. Which of the following calculations would require the use of the quadratic f

Question

17. Which of the following calculations would require the use of the quadratic forma A. Calculating the pH of 0.010 M HCI Calculating the pH of 0.010 M HF (K,-7.1x 10 the pli o 00MCICoo ,.3x 10 B. C. Calculating the pH of 0.010 M CH,COOH (K -1.8 x 10') D. Calculating the pH of 0.010 M HCN (K,-4.9 x 10") E. None of the above 18. When a weak acid it titrated with a strong base the following pH curve is obtained. What is the approximate pK, of the weak acid? B. 3 C. 4 D. 7 E. 14 pH 19. Which indicator would probably not work for detecting the endpoint of the titration depicted in # 1 8 10 20 30 40 50 60 70 0 90 100 mL NaOH added A. bromocresol purple, with a color change in the range pH 5.2 to 6.8 B. thymol blue, with a color change in the range pH- 8.0 to 9.6 C. bromophenol blue, with a color change in the range pH 3.0 to 4.6 D. bromothymol blue, with a color change in the range pH 6.0 to 7.6 True or False (1 point each) A solution of HNO, Would change the color of litmus from red to blue. A. True B. False 20. 21. The equivalence point is the p at which the indicator changes color. A. True B. False 22. Addition of an acid to a solution will cause an increase in pH A. True B. False

Explanation / Answer

18) Ans: (E) (Reason: Here stong base is useing after the end point the pka value increases up to 14).

19) Ans: (c) (Reason: Here useing strong base, The PH value must be in basic reagion).

20) Ans: False

21) Ans: True.

22) Ans: False (PH value decreases and the acid strength increases).

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