Ms. Joanna B

Topics: Acid, PH, Sodium hydroxide Pages: 3 (474 words) Published: May 3, 2012
Chemistry 12 lab 20-D
Chemistry 12 Joanna Bragiel TA
Solution| Colour of Uni. Indicator| pH| Type of hydrolysis| NaCH3COO| Blue- green| 9| Anionic|
NaCl| Green| 8| Neither|
(NH4)Cl| Green- yellow| 7| Neither|
(NH4)2SO4| Green- Yellow| 7| Neither|
AlCl3| Red-orange | 3| Cationic|
Ca(NO3)2| Murky green| 7| Neither|
Fe2(SO4)3| Red | 2.5| Cationic|
Na2CO3| Dark blue | 9.5| Anionic|
Na3PO4| Orange-red | 3| Cationic|
K2SO4| Green| 7| Neither|
KBr| Green| 8| Anionic|
(NH4)2C2O4| Green | 8| Anionic|
NH4CH3COO| Blue green| 9| Anionic|
(NH4)2CO3| Blue green | 9| Anionic|

Solution| Color of Univ Indicator| pH | Type of reaction| K2HPO4| Orange yellow| 6| Further ionization|
KH2PO4| Blue green| 9| Anionic hydrolysis|
NaHCO3| Blue violet | 9.5| Anionic hydrolysis|
KHSO4| Red | 2.5| Further ionization|
NaHSO3| Orange red| 3| Further ionization|

NaCH3COONa + CH3COO-Strong Base Weak Acid CH3COO- + H2O CH3COOH + OH-| |
NH4|
(NH4)2SO4|
AlCl3 Al + 3ClStrong Al + H2O |
Ca(NO3)2|
Fe2(SO4)3|
Na2CO3|
Na3PO4|
K2SO4|
KBr|
(NH4)2C2O4|
NH4CH3COO|
(NH4)2CO3|

1. a. NaOH + CH3COOH NaCH3COO + H2O
CH3COO-+ H2O CH3COOH + OH-
b. NaOH + HCl NaCl + H2O
c. NH3 + HCl H20 + NaCl
d. (NH3)2 + HSO4 (NH4)2SO4
e.Al(H20)5(OH) + HCl3 AlCl3 + 6H20
Al(H2O)6 + H20 Al(H2O)5(OH) + H3O
f. CaOH + HNO3 Ca(NO3)2 + H2O
2. NH4+ + H2O double arrow NH3 + H2O Ka = …
SO4 + H2O double arrow HSO4 + OH Kb = calculate 8.3 x 10^-13 Ka> Kb acidic solution
3. USE TABLE 2
K2HPO4
HPO4 + H2O double arrow H2PO4 + OH
HPO4 + H2O PO4 + H3O
4. Take equations from #3, write the Ka and Kb
Ka for HPO4 = 4.2 x 10^-13
Kb for HPO4 = 1.6 x 10^-7

Follow-Up Questions:
1. KNO3 will keep plants happy in soil due to its ability neutralize the soil. 2. Trisodium phosphate (TSP), available at most...
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