1) Identify the acid and the base in the following reactions. (Type your answer
ID: 892135 • Letter: 1
Question
1) Identify the acid and the base in the following reactions. (Type your answer using the format CO2 for CO2, (NH4)2CO3 for (NH4)2CO3, [NH4]+ for NH4+, and [Ni(CN)4]2- for Ni(CN)42-. Do not include state symbols in the answers.)
(a) O2-(aq) + H2O(l) 2 OH -(aq)
- acid
-base
(b) (CH3)3N(aq) + HCl(aq) (CH3)3NH+ (aq) + Cl -(aq)
-acid
-base
(c) CH3COOH(aq) + H2O(l) H3O+(aq) + CH3CO2-
- acid
-base
2) When each of the following pairs of aqueous solutions is mixed, does a precipitation reaction occur? If so, write the formula and name of the precipitate. (Type your answer using the format CO2 for CO2. Type NONE in the blanks if there is no precipitation reaction.)
(a) silver nitrate + sodium bromide
- formula
- name
(b) ammonium sulfate + iron(II) nitrate
-formula
-name
3) How many total moles of ions are released when each of the following samples dissolves completely in water?
(a) 0.296 mol of K2HPO4
- mol
(b) 5.80 g of MgSO47 H2O
- mol
(c) 6.641 1021 formula units of NiCl2
- mol
4) Select the classification for the following reaction.
Na3PO4(aq) + 3HCl(aq) 3NaCl(aq) + H3PO4(aq)
- combination
- none of these choices is correct
- precipitation
- acid-base
- redox
Explanation / Answer
1a.
Acid H2O
Base O2-
1b
Acid HCl
Base (CH3)3N
1c
Acid CH3COOH
Base H2O
2a. AgBr silver bromide
2b. NONE
3.a. 0.296x 3= 0.888 2K+ and 1 HPO4- per formula unit
3b. 2 x 5.80 g of MgSO4.7H2O / 246.52 g/mol.= 0.0235 mol
( 1 Mg 2+ and 1 SO4- per formula unit)
3c. 6.641 x1021 unit/ 6.02 x 1023 (Avogadro constant) = 1.10 x10-2 mol
4. acid-base
PO43-(aq) + 3H+(aq) = H3PO4(aq) (net reaction)
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