How many mLs are required to change the pH to 4?
How many mLs of 0.1M HCl is required to change the pH of 40 ml of water (pH 7) to pH 4?
- Trevor HLv 78 years agoFavorite Answer
[H+] of 0.1M HCl = 0.1M
[H+] of solution with pH = 4.0 = 10^-4 = 0.0001M
Use dilution equation:
M1V1 = M2V2
0.0001*40 = 0.1 *V2
V2 = (0.0001*40)/ 0.1
V2 = 0.04
Add 0.04mL of 0.1M HCl to 40mL of water , pH = 4.0,