how many mL of .100 M of acetic acid and .100 M of NaOH, would be need to make the volume 1.0 liters and have a pH7.00 if Ka=1.8x10^-5

.5 ml of each

how did u get that can you please explain the steps

To solve this, you require the Henderson-Hasselbach equation: pH = pKa + log(conc.base/conc. acid)

You have pH and pKa, so plug in the numbers, and solve for the ratio of Base/acid. With some algebra, you can then figure out the volume amounts of each species.

what are the numbers for Conjugate acid and conjugate base