# Two Questions I need help

#### Kio

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?

#### bjhopper

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