A 11.5 mL sample of a HCl solution has a pH of 2.000. What volume of water must be added to change the pH to 4

I keep getting 985ml how do i solve this problem?A 11.5 mL sample of a HCl solution has a pH of 2.000. What volume of water must be added to change the pH to 4
pH = 2.00 so [H+] = 0.01 moles per liter

0.01 M x .0115 L = 0.000115 moles



You want a pH of 4, so [H+] = 0.0001 moles per liter

0.000115 moles/0.0001 mole per L = 1.150 Liters

1150 mL - 11.5 mL = 1138.5 mL

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