Which of the following acids (listed with K_a values and would form a buffer wit

Question

Which of the following acids (listed with K_a values and would form a buffer with a acids buffer with a pH et 6.34? A) HI, Ka B) H C) HP, Ka = 5.93 times 10^-1 D) None of the above, not enough data to determine What is the pH A) 0.41 B) 1.41 C) 12.66 D) 13.59 What is the pH of a made by missing 1700 ml of 0 200 M HCI with 4000 ml, of 0.200 M KOH? Assume the solutions of the What is the coordination number for each of the following complexes? EDTA Cu (NH3)4]2+ [Ag(NH3)2]NO3 A reaction is found to have an activation energy of a

Explanation / Answer

Question 14

Moles of HCl used = 15 x 0.1 /1000 = 0.0015 Moles

Moles of NaOH Used = 40 x 0.1 /1000 = 0.004 Moles

NaOH is excess. hence NaOH solution only will be rest

Moles NaOH after neutralization = 0.004-0.0015 = 0.0025 Moles

Total Volume = 15 +40 = 55 ml

Concecntration of NaOH = 0.0025 x 1000 / 55 = 0.04545 M

pOH = - log [OH-]

p OH = -log 0.04545 = 1.34

pH + pOH = 14

pH = 14- pOH

pH = 14-1.34 = 12.66

Answer is Option C

Question 15

Moles of HCl used = 17 x 0.2 /1000 = 0.0034 Moles

Moles of NaOH Used = 40 x 0.2 /1000 = 0.008 Moles

NaOH is excess. hence NaOH solution only will be rest

Moles NaOH after neutralization = 0.008-0.0034 = 0.0046 Moles

Total Volume = 17 +40 = 57 ml

Concecntration of NaOH = 0.0046 x 1000 / 57 = 0.081 M

pOH = - log [OH-]

p OH = -log 0.04545 = 1.09

pH + pOH = 14

pH = 14- pOH

pH = 14-1.09 = 12.91

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