I am prepping for my test and dont understand why certain questions would be suc
ID: 967500 • Letter: I
Question
I am prepping for my test and dont understand why certain questions would be such and such. Please help and give an explanation please! Thank you!
1. Which of these species is most likely to be a Lewis acid and is also least likely to be a Brønsted acid?
(A) NH4+ (B) BF3 (C) H2O (D) OH–
2. Which hydrated metal ion is most acidic under conditions of equal molar concentration in water?
(A) Al3+ (B) Ba2+ (C) K+ (D) Zn2+
3. In which solution will AgCl be the least soluble?
(A) pure water (B) 0.007 M AgNO3
(C) 0.02 M NH3 (D) 0.2 M HCl
4. Which salt will produce a neutral solution when dissolved in water?
(A) NaBr (B) NaCN (C) NaF (D) NaOCl
5. At 95°C, Kw is approximately 1.0 x 10-13. What is the pH of pure water at this temperature?
(A) 13.00 (B) 7.50 (C) 7.00 (D) 6.50
6. What is [H3O+] for a 0.0150 M NH3 solution? Kb of NH3 is 1.8 x 10-5
(A) 6.6x10-13 M (B) 1.9x10-11 M (C) 3.8x10-8 M (D) 5.2x10-4 M
Explanation / Answer
1.BF3 is most acidic since it can easily accept lone pair of electrons.
NH4+ is least acidic since it can not accept H+ ion sice it is already have +ve charge
2.Due to the small size of Al+3 ion it is most acidic
Answer : A
3.AgCl is less soluble in 0.007 M AgNO3 due to common ion effect of Ag+ ion.
4.NaBr is neutral because it is formed by strong base and strong acid.
5.Kw = 1 * 10^-13 = [H+] *[OH-]
[H+] = square root of (10^-13)
pH = -log(3.1622 * 10^-7)
pH = 6.5
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