1. Label each of the following as Arrhenius acid, Arrhenius base, salt, or molec
ID: 1006070 • Letter: 1
Question
1. Label each of the following as Arrhenius acid, Arrhenius base, salt, or molecular compound.
HCl
NaOH
HC2H3O2
MgCl2
H2O
CCl4
Mg(OH)2
2. Which of the following could be considered Brønsted bases.
NH3
NaOH
CH4
CH3CH2COOH
Cl-
CH3NH2
5. Determine the conjugate acid–base pairs in the following equations:
HBr(aq) + H2O(l) H3O+(aq) + Br(aq)
CH3NH2(aq) + H2O(l) CH3NH3+(aq) + OH(aq)
10. The [H3O+] of tomato juice is 2.2 x 104 M. What is the pH of the solution?
14. Calculate the pOH of a solution that has a pH of 8.35.
16. Calculate the pH of a solution with [OH] of 4.0 x 105 M.
18. Which combination makes a buffer solution?
HBr and KBr
H3PO4 and KH2PO4
HCOOH and LiHCOO
HNO2 and NaNO3
22. Write the net ionic equation for the reaction of perchloric acid with barium hydroxide.
Explanation / Answer
Q.1: An Arrhenius acid is a compound that gives H+ ion in water. An Arrhenius base is a compound that gives OH- ion in water.
A salt is fomed by the neutralization reaction of an acid and a base.
HCl: HCl gives H+ ion in water. Hence it is an Arrhenius acid.
NaOH: NaOH gives OH- ion in water. Hence it is an Arrhenius base.
HC2H3O2: HC2H3O2 gives H+ ion in water. Hence it is an Arrhenius acid.
MgCl2: MgCl2 is formed by the neutralization reaction of acid and base. Hence it is a salt.
H2O and CCl4 are molecular compounds.
Mg(OH)2 gives OH- ion in water. Hence it is an Arrhenius base.
Q.2: Bronsted bases are NH3, NaOH and CH3NH2
Q.5: a) HBr(aq) + H2O(l) H3O+(aq) + Br(aq)
conjugate acid–base pairs: HBr and Br-(aq)
H2O(l) and H3O+
(b): CH3NH2(aq) + H2O(l) CH3NH3+(aq) + OH(aq)
conjugate acid–base pairs: CH3NH2(aq) and CH3NH3+(aq)
H2O(l) and OH(aq)
Q.10: pH = - log[H3O+] = - log(2.2x10-4 M) = 3.66 (answer)
Q.14:pH + pOH = 14
=> pOH = 14 - pH = 14 - 8.35 = 5.65 (answer)
Q.16: pOH = - log[OH-] = - log(4.0x10-5 M) = 4.40
pH = 14 - pOH = 14 - 4.40 = 9.60 (answer)
Q.18: HCOOH and LiHCOO will form a buffer solution.
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