Posted: November 10th, 2015

Chemistry

Chemistry

Please complete the following problems on a separate sheet of paper.

1.) Complete the following table
[H3O
+
] [OH-
] pH pOH Acidic, Basic, or
Neutral?
1.0 x 10-6 M
3.49
2.8 x 10-5 M
2.00
2.) Phosphoric acid (H3PO4) dissociates in water to form dihydrogen phosphate (H2PO4
–
). Phosphoric acid
has a Ka of 7.5 x 10-5
. What is the concentration of [H3O
+
] and pH of a solution of 0.100 M H3PO4?
3.) Aniline, C6H5-NH2, a weak base with a Kb of 4.0 x 10-10, reacts with water to produce its conjugate acid
C6H5-NH3
+
. What is the concentration of [H3O
+
] and pH of a solution of 0.100 M C6H5-NH2?
4.) Determine whether each of the following salts will produce an acidic, basic, or neutral solution when
dissolved in water.
a.) NH4Br b.) MgCl2 c.) CH3COO-Na
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