A 1.00 liter solution contains 0.36 M ammonia and 0.28 M ammonium iodide. If 0.1
ID: 1040927 • Letter: A
Question
A 1.00 liter solution contains 0.36 M ammonia and 0.28 M ammonium iodide. If 0.14 moles of nitric acid are added to this system, indicate whether the following statements are true or false. (Assume that the volume does not change upon the addition of nitric acid.)
True/False A. The number of moles of NH3 will increase.
True/False B. The number of moles of NH4+ will increase.
True/False C. The equilibrium concentration of H3O+ will decrease.
True/False D. The pH will remain the same.
True/False E. The ratio of [NH3] / [NH4+] will decrease.
A 1.00 liter solution contains 0.42 M hypochlorous acid and 0.32 M potassium hypochlorite. If 30.0 mL of water are added to this system, indicate whether the following statements are true or false. (Note the the volume MUST CHANGE upon the addition of water.)
True/False A. The concentration of HClO will increase.
True/False B. The concentration of ClO- will increase.
True/False C. The equilibrium concentration of H3O+ will remain the same.
True/False D. The pH will increase.
True/False E. The ratio of [HClO] / [ClO-] will remain the same.
Explanation / Answer
A. False. NH3 will react with nitric acid so its no. of moles will decrease.
B. True. Ammonia and nitric acid will dissociate into NH4+ ion and nitrate ion.
C. True. As nitric acid is completely neutralized, there will be no more H+ ions to react with water.
D. False. The pH will decrease as strong acid nitric acid is added to weak base ammonia.
E. True. The raitio will become smaller as the numerator decreases and the denominator increases simultaneously.
A. False. Concentration is measured interms of moles/litre. As total volume is increasing, concentration will decrease.
B. False. Total volume increases without changing no. of moles. So concentration decreases.
C. True. The no. of moles of acid remains the same.
D. False. The pH is unaffected by addition of water.
E. True. The relative concentration does not change.
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