Which of the following would produce a buffer solution when dissolved in 500 mI,
ID: 965260 • Letter: W
Question
Which of the following would produce a buffer solution when dissolved in 500 mI, of water HCN and NaF HCNO_2 and KNO_2 HBr and NaOH HCl and KCI None of the above mixtures will make a buffer solution Using the following K.'s, which acid will produce the lowest PI-I? HNO_2 HC_3 H_1 O_3 HNO_2 HC_3 H_2 O_3 HF They all produce the same pH solutions What is the molar solubility of AgCI if the K is 1.8 times 10^M? 1.3 times 10^-8 M 9.0. times 10^-11 M 1.3 times 10^8 M 3.2 times 10^-20M None of the above A solution of a weak base is found to have a pH = 10.87. What is the concentration of hydroxide in this solution? 7.41 times 10^-4 M -1.04 M 1.35 times 10^-11 M 3.13 M None of ihc above When HCO_3, is dissolved in water, which of the following species are formed? H_2CO_3 CO_3^2- H_3 O^+ None of the above species is produced upon the dissolving of HCO_3^+ in water. All of the above species are produced upon the dissolving of HCO_3^+ in water.Explanation / Answer
6.
A buffer solution is usually formed by mixing a weak acid and its conjugate base, or a weak base and its conjugate acid.
so answer is A. HCN and NaF
7.
The higher percent ionization, the stronger the acid, lower the pH
The smaller the Ka, the higher the pH
so answer is d. HF
8.
AgCl = Ag+ + Cl-
Ksp = [Ag+][Cl-] = 1.8 x 10 ^-10
The molar solubility of AgCl = [Ag+]
Let [Ag+] = x. Then [Cl-] = x,
so Ksp=
(x)(x) = 1.8 *10 ^-10
x^2 =1.8 *10 ^-10
x = 1.3* 10 ^-5
so answer is A. 1.3*10^-5M
9.
pOH = 14-pH
pOH= 14-10.87
pOH=3.13
so [OH-]= 10^-3.13
[OH-]= 7.41*10^-4 M
10.
since HCO3- is the conjugated base of a weak acid (H2CO3) it undergoes hydrolysis and generates OH-, therefore decreasing the conc. of H+. The pH goes up.
HCO3- + H2O <====> H2CO3 + OH-
so answer is A, H2CO3
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