POH = -log [OH-]
pOH = - log (1 x 10^-11)
pOH = -(-11) = 11
pH + pOH = 14
pH + 11 = 14
pH = 14 - 11 = 3
The empirical formula of ascorbic acid is C6H8O6.
<h3>Empirical formula</h3>
To calculate the empirical mass of a compound from the mass percentage of each element, the value of the<u> molar mass </u>of each element is used, which in this case corresponds to:

From this, we consider that the compound has 100 grams, so the number of moles of each element will be equal to:

Now, divide all the values found by the <u>smallest value</u>, to find the amount present in each element:

As you can see, the value of moles of hydrogen resulted in a decimal number, so it is necessary to multiply all values by a number in common until the three meet as integers:

So, the empirical formula of ascorbic acid is C6H8O6.
Learn more about empirical and molecular formula in: brainly.com/question/11588623
1. The option a. 10 mL has the most uncertainty associated with it, because it has only 2 significative figures, while 10.0 mL has three significant figures and 10.00 has four significant figures.
2. The volume of solution that remains is 145.675 mL - 24.2 mL = 121.475 mL rounded to one decimal = 121.5 mL, given that the measure with the most uncerntainty has only one decimal.