untitled.pdf - Reader 4. Which of the following is not considered to be amphipro

Question

untitled.pdf - Reader 4. Which of the following is not considered to be amphiprotic according to our study of Bronsted-Lowry acids and bases? A) NH3 B) H20 C) HCO D) HSeO;s E) H2PO 5. What is the [OH] in a solution of 0.135 MHC1? A) 1.00x10-7 M B) 0.135 M C) 1.00x10-14 M D) 0.870 M E) 7.41x10-4 M 6. What is the [H;0] in a 0.0255 M solution of monoprotic chloroacetic acid? K2 (chloroacetic acid) 1.4x10-3 A) 1.5×10-12 M B) 5.3×10-3 M C) 1.9x10-12M D) 0.0255 M E) 6.7x10-3M 7. A solution of monoprotic pyruvic acid has a [H0-0.0207 M at equilibrium. What was the initial concentration of pvru Ka (pyruvic acid, HC3H303) 4.10x10-3 A) [HC,H3O3]0= 5.07 M B) [HC,H3O3]0 = 0.242 M C) [HC,H3O3]0=1.17M D) [HC,H3O3]0 = 0.125M E) [HC3H303]o 0.0207 M vic acid? I'm Cortana. Ask me anything 0l 10:50 PM 4/22/2016

Explanation / Answer

(4)

(A ) According to Bronstead Lowry theory NH3 is considered as only proton acceptor and thus a base

(5)

(E) pOH = 14 - pH = 14 + Log[H+] = 14 + Log (0.135) = 13.13

Therefore, [OH-] = 10 - pOH = 10 -13.13 = 7.41 x 10 -14 M

(6)

(B) According Ostwald's theory of weak electrolytes,

[H3O+] = ( Ka x C )1/2= (1.4 x 10 -3 x 0.0255) 1/2 = 5.97 x 10 -3 M

(7)

(D) [H3O+] = ( Ka x C )1/2

0.0207 = (4.10 x 10-3 x C)1/2

Squaring on both sides

0.000428 = 4.10 x 10-3 X C

C = Initial concentration = 0.102 M (approximation has been taken)

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