Two Questions I need help

Kio

Feb 2014
4
0
10 mL of 0.1M HCl was added to 90 mL of water. 10 mL of that solution was added to another 90 mL of water. The student diluted the sample as above another 4 time(s). What is the pH of the solution?







10 mL of 0.1M NaOH was added to 90 mL of water. 10 mL of that solution was added to another 90 mL of water. The student diluted the sample as above another 1 time(s). What is the pH of the solution?
 
May 2010
491
8
10 mL of 0.1M HCl was added to 90 mL of water. 10 mL of that solution was added to another 90 mL of water. The student diluted the sample as above another 4 time(s). What is the pH of the solution?







10 mL of 0.1M NaOH was added to 90 mL of water. 10 mL of that solution was added to another 90 mL of water. The student diluted the sample as above another 1 time(s). What is the pH of the solution?
pH = - log (H+)
(H+) before dilution PH = -log 0.1 =1
first dilution pH = -log 0.01 = 2
continue

pOH = -log (OH-)
pH before dilution pH = 14 -pOH
pOH =-log 0.1 =1
pH = 13
continue
 

Kio

Feb 2014
4
0
I'm sorry wrong answer.
 

Kio

Feb 2014
4
0
I did not answer your questions but showed you the way to find answers.
That's why I hate chemistry :mad:
If I know how to answer the question why should I ask ?

By the way Thank you.