Posted by **John Peterson** on Wednesday, May 23, 2007 at 8:53am.

Calculate soln pH if 100 mL 0.10 M Na2S is mixed with 200 mL 0.050 M HCl. The hint is consider Kb for HS^-. The answer is pH=9.74. Can someone walk me through the neccessary steps to get this answer?

What are the k1 and k2 values for H2S in your text?

Sorry I'm just now responding, I thought I figured it out but my approach was still wrong. Anyways, the K acid value=1.1*10^-7, therefore K conjugate base (HS^-) value= 9.09*10^-8. Because these are bronstend-lowry/acid-base rxns I understand its neccessary to write a principle rxn equation to determine what IONS/ACIDS/BASES are present in solution upon mixing sodium sulfide and HCl acid. What I figure so far is this: Na2S dissociates in Na^+ and S^2-. The sulfide ion reacts with water as a base to produce HS^- and OH^-. Both these rxns go to a large extent and are therefore exist in solution. Likewise, HCl (a strong Bronstend lowry acid) inventories into H30^+ and Cl^-. That is where I got, but now I'm stuck. I would assume that some of the ions can act as bases/acids, and react further, but I'm not completely sure... Thank you

## Answer This Question

## Related Questions

- chemistry - Which of the following when added to 100.0mL of a 0.100M soln of ...
- Chemistry - 50mL of 0.1M HCl is mixed with 50mL of 0.1NaOH. delta T = 3^oC. ...
- chemistry - suppose u r given a conc soln of hcl which is known to be 37% hcl & ...
- Chemistry - Consider the equation A(aq) + 2B(aq) 3C(aq) + 2D(aq). In one ...
- chemistry - Consider the equation A(aq) + 2B(aq) 3C(aq) + 2D(aq). In one ...
- chemistry - it is found that 23.8 ml of 1 x 10^-3 M Sr(OH)2 is required to ...
- Chemistry - A 100.0 mL of 0.200 M methylamine, CH3NH2, is titrated with 0.100 M ...
- chemistry - What is the pH of the solution that results from mixing the ...
- Science - C6H5NH2 + H2O C6H5NH3+ + OH- 1. Aniline, a weak base, reacts ...
- Math Check - For each integer n>1, let A(n) denote the sum of the integers ...

More Related Questions