Assuming the final solution will be diluted to 1.00 L , how much more HCl should you add to achieve the desired pH?

Express your answer to three significant figures and include the appropriate units.

Imagine that you are in chemistry lab and need to make 1.00 L of a solution with a pHpH of 2.80.

You have in front of you

100 mL of 7.00102mol L17.00102mol L1 HCl,

100 mL of 5.00102mol L15.00102mol L1 NaOH, and

plenty of distilled water.

You start to add HCl to a beaker of water when someone asks you a question. When you return to your dilution, you accidentally grab the wrong cylinder and add some NaOH. Once you realize your error, you assess the situation. You have 84.0 mLmL of HCl and 90.0 mL of NaOH left in their original containers.