Homework Help: Chem

Posted by Jenna on Monday, May 7, 2012 at 1:07pm.

Complete the table below: Note: Make simplifying assumptions, do not use the quadratic formula.
What is the pH of the solution created by combining 1.90 mL of the 0.10 M NaOH(aq) with 8.00 mL of the
0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)?

mL NaOH: 1.90
pH w/HCl: 1.21
pH w/HC2H3O2:

Complete the table below: Note: Make simplifying assumptions, do not use the quadratic formula.
What are the pH values if you take into account that the 8.00 mL of 0.10 M Acid was first diluted with 100 mL of water?
mL NaOH: 1.90
pH w/HCl:
pH w/HC2H3O2:

Okay. I found the pH for the first HCl, but I'm not sure on how to do the rest of them. help?

Chem - Jenna, Monday, May 7, 2012 at 4:08pm
Okay I got the second pH w/HCl and it is 2.23. but still can't find the pH of both of the ones w/HC2H3O2. Please help?
Chem - DrBob222, Monday, May 7, 2012 at 5:13pm
1.9 mL x 0.1M NaOH = 0.19 millimols NaOH
8.00 mL x 0.1M HAc = 0.8 mmols HAc.

.........HAc + NaOH ==> NaAc + H2O
I........0.....0.19.........0......0
added...0.8........................
C......-0.19...-0.19....0.19....0.19
E......0.61......0.......0.19....0.19

(HAc) = 0.61mmols/9.9 mL = ?M (9.9 is total volume from 8.00+1.9 = 9.9 total)
(NaAc) = (Ac^-) = 0.19 mmols/9.9 mL = ?
Then pH = pKa + log(base)/(acid)

For the diluted part,
(HAc) = 0.61 mmols/101.9 mL = ?
(Ac^-) = 0.19 mmol/101.9 mL = ?

Answer this Question

Related Questions

chem - Complete the table below: Note: Make simplifying assumptions, do not use...
chemistry - Complete the table below: Note: Make simplifying assumptions, do not...
chem - Complete the table below: Note: Make simplifying assumptions, do not use ...
Chemsitry - Hi I have done this problem like 15 times when I find the mole I get...
chemistry - What is the pH of the solution created by combining 11.40 mL of the ...
chem lab (webwork) - When a good indicator has been chosen, the pH at which the ...
Chem Webwork UCI - Complete the table below: What is the pH of the solution ...
Chem Webwork - Complete the table below: What are the pH values if you take into...
Chemistry - What is the pH of a 1.0E-8 M solution of HCl? Please note that you ...
Math - Use the quadratic formula to solve each of the following quadratic ...

For Further Reading

First Name:
School Subject:
Answer: