When a reaction reaches Equilibrium A. The value of equilibrium constant is 1 B.

Question

When a reaction reaches Equilibrium A. The value of equilibrium constant is 1 B. The reaction is at peace. C. The rate constants of the forward and reverse reactions are equal. D. The rates of the forward and reverse reactions are equal. During Titration the point at which the color change is observed is called the A. equivalence point B. Standard point C. indicator point D. End point Kay and Hashim measured the pH of a glass of wine to be 3, 56 what is the hydrogen ion [H^+] concentration of the wine? A. 2.75 times 10^-4 B. 0.0356 C. 2.75 times 10^-5 D. 3.63 times 10^-11 E. None of the above What is the hydroxide ion [OH-) concentration of the wine above? A. 3.63 times 10^3 B. 2.75 times 10^10 C. 3.63 times 10^-11 D. 2.75 times 10^-4 E. 3.56 Barbie and Tarbetha measured the solubility Product Constant (Ksp) of Ca(OH)_2 to be 2.55 times 10^-4 at 25 degree C. What is the molar solubility of Ca(OH)_2. A. 2.41 times 10^-5 B) 3.99 times 10^-2 C. 1.67 times 10^-2 D. 1.48 times 10^-2 E. 6.90 times 10^-2

Explanation / Answer

10)
At equilibrium, rate of forward reaction is equal to rate of backward reaction
Answer: D

11)
This point is called end point
Answer: D

12)
pH = -log [H+]
3.56 = -log [H+]
[H+] = 2.75*10^-4 M
Answer: A

13)
[OH-] = 10^-14 / [H+]
= 10^-14 / (2.75*10^-4)
= 3.63*10^-11
Answer: C

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