Determine the numbers of moles of sodium hypobromite

Question

1. Determine the percent ionization of 0.10M botanic acid(ka=1.5*10^-5) in a solution containing 0.050M sodium butanoate?

4.52%

2.0*10^-2

3.0 *10^-4%

3.0*10^-2%

3.0*10^-5%

2. Determine the numbers of moles of sodium hypobromite, NaBrO, should be added to 1.00L of 0.200M hypobromous acid, DBrO(ka=2.5*10^-9), to produce a buffer solution of pH 8.80?Suppose that no volume change occurs when the NaBrO is added.

0.20mol

0.13mol

0.32 mol

A buffer solution with this pH cannot be formed

3. Determine the pH of a solution formed by adding the 50.0mL of 6.0 M NH₃ to 75.0 mL of 1.0MHCl.(kb(NH₃)=1.8*10^-5)

5.22

8.79

4.27

9.26

9.73