The pH of an aqueous 0.1 M H_3PO_4 solution is adjusted to pH = 14.0 by addition
ID: 1001022 • Letter: T
Question
The pH of an aqueous 0.1 M H_3PO_4 solution is adjusted to pH = 14.0 by addition od strong base, which of the following would be the primary species in solution at this pH? H_3PO_4 H_2PO_4^- HPO_4^2- PO_4^3- H_3O^+ What is the pH of an aqueous mixture of 0.50 M HCO_2H (formic acid) and 0.10 M HCO_2Na (sodium formate)? 3.74 3.26 4.44 4.22 What is the pH of 0.10 M HCO_2Na (sodium formate)? 2.37 5.63 8.37 9.01 11.63 7.5 times 10 degree g of HClO_4 is dissolved in 250 ml. of water. What is the pH of the resulting solution? 2.12 10.53 2.99 3.52 11.01 What is the volume of 0.10 M solution of NaOH that should be added to 10. ml of 0.20 M of H_2SO_4 to obtain solution with pH = 7.0? 10. ml 20. ml 30. ml 40. ml 80. ml What is the molar solubility of barium fluoride in pure water? K_vp of barium fluoride is 1.5 times 10^-6 2.0 times 10^-4 M 5.7 times 10^-6 M 2.9 times 10^-3 M 7.2 times 10^-3 M 1.5 times 10^-2Explanation / Answer
I have solved the four problems with different approach, please post one more question to get the remaining answers
16) Since the pH is highly basic, hence there exists someone which can't donate a proton, hence the correct answer is PO4(3-), therefore the correct answer is Option D
17)
Using hessley henderbach equation
pH = pKa + log[A-/HA]
pH = 3.75 + log[1/5]
pH = 3.75 - log(5) = 3.05
Hence the correct answer is Option E
20)
M1V1 = M2V2
0.10M * V = 2 * 0.20 * 10
V = 40 mL
Hence the volume of NaOH added must be 40mL, correct answer is Option D
21)
Ksp = 4s^3 = 1.5 * 10^(-6)
s^3 = 0.375 * 10^(-6)
s = 0.7211 * 10^(-2) = 7.211 * 10^(-3)
Hence the correct answer is Option D
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