1) The solvent cation in liquid ethanol, CH3CH2OH, is
a) CH3CH2O- b) H+ c) CH3CH2OH+ d) CH3CH2OH2+ e)
CH3CH2OH-
Answer _________
Fill in the blanks.
the normality of 0.20M solution of H2SO4 ________________________
The following reaction is best classified as an Arrhenius, Bronsted or
Lewis acid base reaction? SiF4 + 2F- ---( SiF62-
_________________
The conjugate base of H2PO3- _________________________
The conjugate acid of AsH3 _________________________
Identify the correct answer in each case.
a) The stronger acid, H3SbO3 or H3AsO3 ? _____________________
b) The stronger base, GeH4 or SiH4 ? ________________________
The stronger acid, H2TeO3 or H2 TeO4 ? _______________________
The stronger base, Pd (OH)2 or Sn (OH)2 ? _________________________
The stronger conjugate acid, the conjugate acid of Cl04- or the
conjugate acid of MnO4-? ____________________________
The amphiprotic species in the following equation
H2CO3 (--( H+ + HCO3- _____________________
The conjugate base in the Bronsted - Lowry reaction
HBr + NH3 (-( NH4+ + Br- _______________________
The Lewis base in the reaction
Cu(NO3)2 + 4H2O (-( Cu(H2O)42+ + 2NO3- ____________________
4. In a 0.90M solution of the weak acid HA, the acid is 11% ionized.
What is the ionization constant, Ka, for the acid? (Show work)
Ka for HC2H3O2 is 1.8 x 10-5. To adjust the pH value of one liter of
0.020M acetic acid to pH = 6.0, one must add how many grams of
KC2H3O2? (Show work)
Would the pH of a 0.1M solution of Cs2SO3 be less than, greater than, or
equal to 7.0? (Show work)
In the titration of HClO4 with LiOH, 50.0mL of 0.35OM LiOH is added to
30.0mL of 0.400M HCl04. What is the pH at this point in the titration?
(Show work)
8. What is the pH of a buffer made by mixing equal volumes of 0.10M NH3
and 0.10M NH4Cl? Kb for NH3 = 1.8 x 10-5
(Show work)
9. What is the pH after this same solution is made 0.020M in KOH?
(Show work)
10. Below a pH of 4.8, an indicator, exists in the blue acid form, HIn.
At pH 4.8 about 10% of the indicator exists in the rose base form.
What is the ionization constant of this indicator? (Show work)
Chemistry Homework Solutions
#13742
Acid, Bases, equilibra questions
Please see the attached file for full problem description.
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