Which of the following salts will produce a basic solution when added to pure wa

Question

Which of the following salts will produce a basic solution when added to pure water? A) NaCl B) Li_2S C) CsI D) KHSO_4 E) NH_4Br A 1.0 M solution of a weak monoprotic acid is 0.40% ionized. What is the acid-ionization constant, K_a, of the weak acid? A) 4.0 times 10^-3 B) 1.6 times 10^-6 C) 1.6 times 10^-7 D) 1.6 times 10^-5 E) 4.0 times 10^-1. Acids and bases neutralize each other, in stoichiometric ratio, in solution. Which of the following mixtures will be a buffer when dissolved in 1 L of water? A) 0.3 mol KCl and 0.3 mol HC1 B) 0.2 mol HBr and 0.1 mol NaOH C) 0.2 mol HC_2H_3O_2 and 0.1 mol NaOH D) 0.1 mol Ba(OH)_2 and 0.2 mol HCl E) 0.4 mol NH_3 and 0.4 mol HCl Calculate the pH of a solution that is 2.00 M HF, 1.00 M NaOH, and 0.411 M NaF. (K_a = 7.2 times10^-4) A) 3.29 B) 2.99 C) 3.14 D) 2.46 E) none of these The concentration of H_3O^+ in a solution is 3 times 10^-4 M at 25 degree C. What is its hydroxide-ion concentration? A) 3 times 10^-11 M B) 5 times 10^-10 M C) 3 times 10^-4 M D) 3 times 10^-10 M E) 6 times 10^-10 M

Explanation / Answer

Q10

basic solution must be high in OH- ions

then

a) NaCl = neutral salt, pH remains as 7

b) Li2S

Dissociates as follows

Li2S = 2Li + S-2

S-2 + H2O <-> HS- + OH-

there is OH- p resence, so this is basic

c)

CsI is a neutral salt, will have pH = 7

d)

KHSO4 dissociates as follows

K+ + HSO4-

note that SO4- is strong so

H+ + SO4-2 forms, this is acidic

e)

NH4Br dissociates as follows

NH4+ + Br-

note that NH4+ is acidic, will donate NH3 + H+ to form acidic solution

therefore

choose Li2S

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