Which of the following statements is true? A) If Q K, it means the reverse react

Question

Which of the following statements is true? A) If Q K, it means the reverse reaction will proceed to form more reactants. E) If Q = K, it means the reaction is not at equilibrium. The following reaction is exothermic. Which change will shift the equilibrium to the left? 2 SO_2 (g) + O_2 (g) = 2 SO_3 (g) A) decreasing the temperature B) adding O_2 C) removing SO_3 D) decreasing the volume (increasing the pressure) E) none of the above Determine the pH of a 0.227 M of a weak acid whose K_a is 1.7 times 10^-9. A) 4.59 B) 9.41 C) 4.71 D) 10.14 E) 9.29 Determine the [OH^-] concentration in a 0.169 M solution of the strong base Ba(OH)_2. A) 2.96 times 10^-14 M B) 0.338 M C) 5.92 times 10^-14 M D) 0.169 M E) 0.298 M Calculate the pH of a solution that contains 3.8 times 10^-8 M OH^- at 25 degree C. A) 6.59 B) 7.42 C) 12.72 D) 2.63 times 10^-7 E) -7.41 Calculate the pH of a buffer that is 0.225 M HCHO_2 and 0.162 M K CHO_2. The K_a for HCHO_2 is 1.8 times 10^-4. A) 3.94 B) 10.5 C) 3.55 D) 10.1 E) 3.74 Which of the following is true? A) An effective buffer has a [base]/[acid] ratio in the range of 100 - 1000. B) A buffer is composed of a strong base and its conjugate acid. C) A buffer is composed of a strong acid and a salt. D) The higher the concentration of weak acid and conjugate base, the higher the buffer capacity. E) The buffer range of an acidic buffer is the weak acid's pk_a plusminus 10. A 1.00 L buffer solution is 0.250 M in mu F and 0.250 M in NaF. Calculate the pH of the solution after the addition of 0.150 moles of solid NaOH. Assume no volume change upon the addition of base. The K_a for HF is 3.5 times 10^-4. A) 4.06 B) 3.46 C) 2.86 D) 3.63 E) 4.24 A 100.0 mL sample of 0.18 M HCl is titrated with 0.27 M NH_3, Determine the pH of the solution after the addition of 66.67 mL of NH_3 (this is the equivalence point).

Explanation / Answer

10) pOH=-log[3.8*10^-8]

= 7.42

Now we know that pH=14-pOH

=14-7.42

=6.58

IT IS VERY CLOSE TO OPTION A HENCE OPTION A IS CORRECT

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