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  3. 1. sulfanilic acid (nh2c6h4so3h) has a pka of 3.23

1. Sulfanilic acid (NH2C6H4SO3H) has a pKa of 3.23. How many grams of Na(NH2C6H4SO3) [182.1 g/mol]...

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Chemistry

1. Sulfanilic acid (NH2C6H4SO3H) has a pKa of 3.23. How manygrams of Na(NH2C6H4SO3) [182.1 g/mol] would you have to dissolve in125 mL of water to get a pH of 7.97?

a. 0.59

b. 1.2g

c. 3.5g

d. 4.8g

2. When KNO2 is dissolved in water, ___________.

a. [H3O+] = [OH-]

b. [H3O+] < [OH-]

c. [H3O+] > [OH-]

3. Calculate the concentration of HCN in a sol’n prepared bydissolving 10.8 g of NaCN (49 g/mol) in enough water to make 500.0mL of sol’n.  Ka for HCN = 4.0 x 10-10

  1. 0.0057 M

    0.0033 M

    0.41 M

    0.15 M

4. What is the pH of a sodium formate (68 g/mol) solutionprepared by adding 0.680 g of sodium formate to 100.0 mL of waterat 25°C? The Ka for formic acid is 1.8 x 10-4 at 25°C.

2.38

5.63

8.37

11.62

5. Of the compounds below, a 0.10 M aqueous solution of ________will have the highest pH.

KCN, Ka of HCN = 4.0 x 10-10

NH4NO3, Kb of NH3 = 1.8 x 10-5

NaClO, Ka of HClO = 3.2 x 10-8

NaHS, Ka of H2S = 5.6 x 10-8

NaC2H3O2, Ka of HC2H3O2 = 1.8 x 10-5

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