1a. Indicate which solution in each pair has the lower pH. Your response should

Question

1a. Indicate which solution in each pair has the lower pH. Your response should be a four letter "word". The first letter should be either a or b, the second letter either c or d, and so forth. For example, the word aceg would be used to indicate that the first member of each pair has the lower pH.

a) 0.1 M HClO4 or b) 0.2 M HClO4
c) 0.1 M NaClO or d) 0.2 M NaClO
e) 0.1 M HF or f) 0.1 M HNO2

1b. Indicate whether each of the following four solutions is acidic (a), basic (b), or neutral (n). Your answer should be a four letter "word" consisting of the letters a, b and n, with no commas or spaces. For example, the "word" aanb would be used to indicate that the first two solutions are acidic, the third neutral, and the fourth basic

0.1 M KNO2
0.1 M NH4NO3
0.1 M Na2O
0.1 M NaClO4

1c. Indicate whether each of the following four solutions is acidic (a), basic (b), or neutral (n). Your answer should be a four letter "word" consisting of the letters a, b and n, with no commas or spaces. For example, the "word" aanb would be used to indicate that the first two solutions are acidic, the third neutral, and the fourth basic

a solution of pH = 3
a solution of pOH = 9
a solution in which [OH1-] = 10-4M
a solution in which [OH1-] = 10-8M

g) 0.1 M NaOH or h) pure water

Explanation / Answer

1a.

lower pH, is high on H+ ions

then

a) 0.1 M HClO4 or b) 0.2 M HClO4, since more concentration
c) 0.1 M NaClO or d) 0.2 M NaClO since hydrolysis will take out H+ ions, we need the least concentrated
e) 0.1 M HF or f) 0.1 M HNO2 this is a strong acid

1b.

0.1 M KNO2 --> basic, since NO-2 + H2O <-> HNO2 + OH-
0.1 M NH4NO3 --> acidic since NH4+ + H2O <-> NH3 + H3O+

0.1 M Na2O --> neutral
0.1 M NaClO4 --> neutral

1c.

a solution of pH = 3 this is acidic
a solution of pOH = 9 , pH = 14-9 = 4, this is acidic
a solution in which [OH1-] = 10-4M --> pOH = 10^-4 = 4 then this is basic
a solution in which [OH1-] = 10-8M --> pOH = 10^-8 = 8 then this is acidic

g) 0.1 M NaOH or h) pure water... NaOh is basic, pure water is neutral

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